CDL

Air Brakes

1. Oil and water usually collect in compressed air tanks. If you do not have an automatic tank drain, when should you drain the air tanks? After every working day.
2. What is the S-cam used for?To apply the brakes.
3. Which of the following makes the total stopping distance for air brakes longer than that for hydraulic brakes?Brake lag distance.
4. The brake system that applies and releases the brakes when the driver uses the brake pedal is the:Service brake system.
5. To make an emergency stop with air brakes, using the stab braking method, you should:Brake as hard as you can, get off the brakes when the wheels lock, get back on the brakes when the wheels start rolling again.
6. Brake lag distance at 55 mph is __ feet?32
7. If your vehicle has an alcohol evaporator, it is there to:Reduce the risk of ice in air brake valves in cold weather.
8. What can legally hold a parking or emergency brake in position for a truck, truck tractor or bus?Spring pressure
9. The braking power of the spring brakes: Depends on the adjustment of the service brakes.
10. Which of the following should you do before leaving your vehicle unattended?Do all of the above.
11. Under which conditions are front wheel brakes good?All weather conditions
12. If the air tanks are not drained,your brakes may fail because of water freezing.
13. An antilock braking system (ABS)activates when your wheels are about to lock up.
14. Which of the following can cause brakes to fade or fail?All of the above
15. What is the best way to test if your vehicle's spring brakes come on automatically?All of the above are correct.
16. If your vehicle has a properly functioning dual air brake system and minimum-sized air tanks, the air pressure should build from 85 to 100 psi within ____ seconds.45
17. The air compressor will stop pumping air into the air tanks at ____ psi.125
18. Excessive heat caused by overuse of the service brakes can causethe brakes to fade.
19. Excessive use of the service brakes may result in overheating, which can lead toexpansion of the brake drums.
20. A typical air brake system is fully charged at125 psi.
21. During normal driving, spring brakes are usually held back byair pressure.
22. During your final air brake check, if the air pressure does not build up fast enough,the air pressure may drop too low during driving.
23. To test the static air leakage rate, you shouldturn off the engine, release the parking brake, and let the system settle.
24. Air brakes use _________ to make the brakes work.compressed air
25. When you press the brake pedal,compressed air enters the brake chambers.

1. The air compressor governor controls:When air is pumped into the air tanks.
2. Of the choices below, the first thing to do when a low air pressure warning comes on is:Stop and safely park as soon as possible.
3. Air brake equipped vehicles must have:A supply pressure gauge.
4. Modern air brake systems combines three different systems. They are the service brakes, the parking brakes and the:Emergency brakes.
5. If you must make an emergency stop, you should brake so that you:Stay in a straight line and can steer.
6. The driver must be able to see a warning that is given before air pressure in the service air tanks falls below:60 psi
7. The most common type of foundation brakes found on heavy vehicles is the:S-cam brake
8. When driving down a long steep hill you should:Release the brake when you are 5 mph below your "safe" speed.
9. The modulating control valve is?A spring-loaded valve that will let you put on the brakes on slowly if the service brakes fail.
10. Which of the following will be true about your brake function if your antilock braking system (ABS) fails?You will still have normal brake function and will just need to get the ABS repaired soon.
11. Which of the following is not part of the braking process when you're driving a tractor-trailer combination vehicle with an antilock braking system (ABS)?You should drive faster so that you will be able to keep the trailer and tractor straight.
12. Which of the following are true about a dual air brake system?All of the above are true.
13. How can you tell if your vehicle is equipped with an antilock braking system (ABS)?Check if the vehicle was manufactured after 1998.
14. Spring brakes areall of the above.
15. In the event of a brake system failure, the emergency brake system uses __________ to stop the vehicle.parts of the service brakes and parking brakes
16. Repeatedly pressing and releasing (fanning) the brake pedal may result ina loss of brake air pressure.
17. If the spring brakes are on, when should you push the brake pedal?Never
18. You'll know that your brakes are fading ifyou have to press the brake pedal harder than usual to control your speed.
19. A converter dolly with antilock brakes (ABS) is required to havea yellow lamp on the left side.
20. Which of the following is the most important thing about hard braking?Don't lock the wheels for longer than an instant.
21. In controlled braking, youbrake in a straight line.
22. If oil and water collects in the air tanks, what could happen to the brakes?The brakes could fail.
23. S-cam drum brakes have an S-cam in each brake chamber. Why is it called an "S-cam?"It is shaped like the letter "S."
24. To test the air service brakes,brake firmly while slowly moving forward.
25. When can you leave your truck unattended without first applying the parking brakes or chocking the wheels?Never

1. If your truck or bus has dual parking control valves it means that you can use pressure from a separate tank to:Release the spring brakes to move a short distance.
2. The brake pads should be _____ for the brakes to be on?Against the drum.
3. You should know that your brakes are fading when:You must push harder on the brake pedal to control your speed on a downgrade.
4. The application pressure gauge shows the driver how much pressure:Is being applied to the brakes.
5. If the air compressor should develop a leak, what keeps the air in the tanks?The one-way check valve
6. Why drain water from the compressed air tanks?Water can freeze in cold weather and cause brake failure.
7. During normal driving, spring brakes are usually held back by:Air pressure
8. Brake drums must not have cracks longer than _____ the width of the friction area?1/2
9. After the initial drop, the maximum acceptable leakage rates per minute are3 psi for single vehicles and 4 psi for combination vehicles.
10. How do brakes work on a long, steep downgrade?They work as a supplement to the braking effect of your engine.
11. How would you check your truck's slack adjusters?Use gloves and pull hard on each slack adjuster you can reach.
12. The parking brake control lets the air out of the brake chambers.
13. If the low air pressure warning signal is not working, it may lead to sudden emergency braking in a single-circuit air system.
14. Your vehicle has a dual air brake system. One of the systems loses air pressure. What will happen? Either the front or rear brakes will not be fully operational.
15. Under ideal conditions, the average driver of a truck or bus equipped with air brakes and traveling at 55 mph would require what stopping distance? More than 400 feet
16. Modern air brake systems are three different systems combined: the service brakes, parking brakes, and _______ brakes.emergency
17. To check the free play of manual slack adjusters on S-cam brakes you should: Park on level ground, chock the wheels, and release the parking brakes.
18. Your truck or bus has a dual air brake system. If a low air pressure warning comes on for only one system, what should you do?Stop. Safely park and continue only after the system is fixed.
19. If your vehicle has an alcohol evaporator, every day during cold weather you should:Check and fill the alcohol level.
20. With S-cam drum brakes, when the brake chamber fills with air, air pressure pushes the push rod out, moving the ________ and thus rotating the ________.slack adjuster; brake camshaft
21. In which of the following situations should you NOT apply the parking brakes? If the brakes are very hot
22. Which of the following can cause brakes to fail or fade? Overheating, low air pressure, and not relying on the engine braking effect
23. If you need to stop quickly and your vehicle lacks antilock brakes, you can use either of the above.
24. Tractor and straight truck spring brakes will come fully on when the air pressure drops to a range of20 to 45 psi.
25. The modulating control valve allows you to control thespring brakes.

1. Air loss in a straight truck or bus should not be more than _____ with the engine off and the brakes applied.3 psi in one minute
2. What activates the stop switch? Air pressure.
3. A straight truck or bus air brake system should not leak at a rate of more than ____ psi per minute with the engine off and the brakes released. 2
4. Vehicles with air brakes must have:An air pressure gauge to show the pressure available for braking.
5. Slack adjusters should not have any more than _____ of play?1 inch
6. What is the best way to test your vehicle's low air pressure warning signal?With the engine off, step on and off the brake pedal to lower the air pressure below 60 psi.
7. Which vehicles must have low air pressure warning signals? All vehicles with air brakes currently in operation must have low air pressure warning signals.
8. On a long or steep downgrade, once you have reached your "safe" speed, brake until you are traveling5 mph slower.
9. To check the slack adjusters on S-cam drum brakes, you should first park on level ground, chock the wheels, and release the parking brakes.
10. Before starting down a hill, you should be in the proper gearso you only have to apply the brake just hard enough to feel a definite slowdown.
11. To apply the parking brakes under normal conditions,let the air out of the brake chambers.
12. Slack adjusters areall of the above.
13. Which of the following is NOT part of the air brake system?Radio signal system
14. Air braking takes more time than hydraulic braking because air brakes:Need to have airflow through the lines to work.
15. In air brake vehicles, the parking brakes should be used: Whenever the vehicle is parked.
16. The brake pedal in an air brake system:Controls the air pressure applied to the brakes.
17. Your vehicle has a dual air brake system, if a low air pressure warning comes on for the secondary system, you should?Stop, safely park, and continue only when the system is fixed.
18. The tractor protection valvedoes all of the above.
19. What is the first thing you should do if the low air pressure warning comes on?Stop
20. When should you use the parking brake?Every time you leave your vehicle, with a few exceptions
21. The supply pressure gauge shows the driver how much pressure:Is in the air tanks.
22. Which of the following is NOT part of the drum brake?Safety valve
23. The safety release valve will blow at _____ psi? 150
24. In an emergency stop you should? Use the stab braking method
25. What are spring brakes?If the air brakes leak down, springs apply the brakes to stop the vehicle.

Combination

1. When should you use the hand valve to park a combination vehicle?never
2. Which answer is correct for the air valves when testing the trailer service brakes only?Service Brake: off; Parking Brake: off; Trailer air supply: in / open; Trolley: applied
3. You are coupling a semi-trailer to your tractor but have not yet backed under. The trailer is at the right height when:The trailer will be raised slightly when the tractor is backed under it
4. How should you test the tractor trailer connection for security?Pull gently forward in low gear against the locked trailer brakes, then inspect the coupling
5. Which answer is correct for the air valves when testing the trailer spring / parking brakes only?Service Brake: off; Parking Brake: off; Trailer air supply: out; Trolley: released
6. Your emergency air line breaks or gets pulled apart while you are driving. The loss of pressure will cause the:Emergency trailer brakes to come on
7. You supply air to the trailer tanks by:Pushing in the trailer air supply valve
8. There are two things that a driver can do to prevent a roll over. They are: (1) keep the cargo as close to the ground as possible; and (2):Go slowly around turns
9. You are coupling a semi-trailer to your tractor but have not yet backed under. The trailer is at the right height when:The trailer will be raised slightly when the tractor is backed under it
10. The fifth wheel locking lever is not locked after the jaws close around the kingpin; this means: The coupling is not right and should be fixed before driving the coupled unit
11. When backing your tractor under a trailer, you should expect:Trailer will be lifted slightly when the tractor backs under it
12. Before you start to uncouple, you mustmake sure the ground is solid and can support the weight of the trailer.
13. During uncoupling, you should disconnect the electrical cable andhang it with the plug down.
14. As part of your vehicle inspection test,if yourvehicle is equipped with air brakes and has a trailer,youwill inspect theair connections between the truck or tractor and the trailer.Makesurethat the_are locked in place and free of damage or air leaksglad hands
15. If your vehicle gets stuck on a railroad track, you shouldget away from your vehicle and call 911 or the posted emergency number.
16. If your test of the tractor protection valve is successful,the tractor protection valve control (trailer air supply control) will pop out or go from "normal" to "emergency."
17. You should not use the trailer hand brake to straighten out a jackknifing trailer, becausethe brakes on the trailer wheels caused the skid in the first place.
18. You should not use the trailer hand valve while driving becauseof the danger of making the trailer skid.
19. A trailer is most likely to jackknife when it isempty.
20. When backing a tractor under a trailer, you shouldalways use the lowest reverse gear.

1. The best way to tell if your trailer has started to skid is tosee it in your mirrors.
2. Describe what the trailer air supply control does.It is used to supply the trailer with air, shut the air off, and apply the trailer emergency brakes.
3. If your vehicle is equipped with dummy couplers, why should you connect the glad hands to them?It will keep dirt and water out of the lines.
4. When coupling a tractor-semitrailer, to test the trailer air brakes, you should place the tractor protection valve control in what position?normal
5. Trucks roll over more easily when fully loaded and areten times more likely to roll over in a crash than empty rigs.
6. To stop a trailer skid, you shouldrelease the brakes.
7. After you supply air to the trailer, make sure the airlines are not crossed and the trailer brakes are working. This is done by:Applying and releasing the trailer brakes and listening for brake sounds.
8. The air leakage rate for a combination vehicle (engine off, brakes off) should be no more than ____ PSI per minute.3
9. If the service airline comes apart while you are driving a combination vehicle, but the emergency line stays together, what will happen right away?Nothing is likely to happen until you try to apply the brakes
10. You are coupling a tractor and semi-trailer and have connected the air lines. Before backing under the trailer, you should:Supply air to the trailer system, then pull out the trailer air supply knob to lock the trailer brakes
11. You have coupled with a semi-trailer. In what position should you put the front trailer supports before driving away?Fully raised with the crank handle secured in its bracket
12. The driver crosses the airlines when hooking up to an old trailer. What will happen?If the trailer has no spring brakes, you can drive away, but you will not have trailer brakes
13. Why should you be sure that the fifth wheel plate is greased as required?To prevent steering problems
14. To prevent rollover, cargo should bespread evenly across the trailer(s) and as low as possible.
15. Where should the tractor be when you inspect the landing gear after uncoupling the trailer?With the tractor frame under the trailer
16. An antilock braking system (ABS) is usefulwhether it is on the tractor or the trailers.
17. You should use chocks when parking a trailer without spring brakes becauseif the air supply leaks away, there will be no brakes.
18. To unlock the fifth wheel, pull the release handle to the _______ position.open
19. What is a tractor jackknife?When you lock up the drive tires on the tractor and the tractor spins out sideways as the trailer continues to push forward
20. What gear should the tractor engine be in after you uncouple the trailer and are inspecting the trailer supports?Neutral

1. The air leakage rate for a combination vehicle (engine off, brakes on) should not be more than ____ PSI per minute.4
2. Why should you lock the tractor glad hands to each other or to the storage bracket when you are not towing a trailer?It will keep dirt and water out of the lines
3. You are driving a combination vehicle when the trailer breaks away, pulling apart both air lines. You would expect the trailer brakes to come on and:The tractor protection valve to close
4. The hand valve should be used:To test the trailer brakes
5. Combination vehicles take longer to stop when they are empty than when they are fully loaded, becausethere is less traction.
6. To uncouple a loaded trailer, after the landing gear has made firm contact with the ground, you shouldturn the crank a few more times to lift some weight off the tractor.
7. The tractor protection valve is designed to close automatically when the air pressure falls into the pressure range specified by the manufacturer, typically20 to 45 psi.
8. If the brakes did not release when you pushed the trailer air supply valve, you shouldcheck the air line connections.
9. In general, the higher your truck's center of gravity, theeasier it is to turn over.
10. When you test the tractor protection valve, the red air supply control knob should go into the ________ position.emergency
11. When coupling, the proper position of the fifth wheel istilted down toward the rear of the tractor.
12. The front trailer supports are up, and the trailer is resting on the tractor, make sure:Both answers are correct
13. You are coupling a tractor to a semi-trailer and have backed up but are not under it. What should you hook up before backing under?The emergency and service air lines
14. Before you back under a trailer, make sure the:Trailer brakes are locked
15. On a double or triple vehicle, which wheels off-track the most?The rear wheels of the last trailer
16. Which statement best illustrates the "crack-the-whip" effect?The trailer is half full, and the cargo is loaded in the front of the trailer. When making a sudden movement of the steering wheel, the cargo will tend to forcefully slide to the back of the trailer, forcing the trailer to roll over.
17. To test the tractor protection valve, charge the trailer air brake system, turn off the engine, andstep on and off the brake pedal several times.
18. Which of these vehicles off-tracks the most?A 5-axle tractor towing a 52-foot trailer
19. Almost half of all truck driver deaths are the result ofrollovers
20. At night, when a vehicle is carrying a load that extends four feet or more beyond the rear of the body, there must be _______ at the extreme end of the load.red lights
1. In normal driving, some drivers use the hand valve before applying the brake pedal to prevent a jackknife. Which of these statements is true?It should not be done
2. You should not back a tractor under a trailer until the whole air system is:At normal pressure
3. After you supply air to the trailer, make sure the airlines are not crossed and the trailer brakes are working. This can be done by:Applying and releasing the trailer brakes and listening for brake sounds
4. What is the safest way for you to make a turn without entering another traffic lane?You should turn wide as you complete the turn.
5. Even before antilock braking systems (ABS) were required, some vehicles already had them. How can you check if your vehicle has ABS?Look under the vehicle for the ECU and wheel speed sensor wires coming from the back of the brakes.
6. What is the emergency air line?Air lines that control the emergency brakes on combination vehicles
7. You are uncoupling a trailer. After you shut off the trailer air supply and lock the trailer brakes, you shouldback up gently to ease pressure on the fifth wheel locking jaws.
8. A tractor with a(n) _______ trailer requires the shortest amount of stopping distance.fully loaded
9. The tractor protection valve will close and the trailer _______ brakes will come on when there is a major leak in the brake line.emergency
10. You have a major leak in the service line, and you put on the brakes. Service air pressure will escape and cause the:Trailer emergency / spring brakes to come on
11. Semi-trailers made before 1975 that are equipped with air brakes:Often do not have spring brakes
12. How much space should be between the apron and fifth wheel after coupling?None
13. On a trailer, where is the yellow antilock brake (ABS) malfunction lamp located?On the front left or rear left corner
14. What are the other names for the service air line?Control line and signal line
15. You should not back a tractor under a trailer until the whole air system isat normal pressure.
16. Air and electrical lines from the tractor to the trailer should besecured but with enough slack for turns.
17. Which of these statements is true?Bobtail tractors can take longer to stop than a combination vehicle loaded to the maximum gross weight
18. Which part of the kingpin should the locking jaws close around?The shank
19. Under good driving conditions, you should leave at least one second of space between your vehicle and the vehicle ahead for every ___ feet of your vehicle's length.10
20. You supply air to the trailer tanks bypushing in the trailer air supply control.
1. When you get ready to back under the semi-trailer you should line up:Directly in front of the trailer.
2. Air lines on a combination vehicle are often color coded to keep them from getting mixed up. The emergency line is _____; the service line is _____.Red, blue
3. Low underneath clearance vehicles can be risky at railroad crossings becausethey are more likely to get stuck on raised railroad crossings.
4. After you have coupled the trailer, you should start to raise the landing gear by usinglow gear.
5. At what angle do you hold your airline glad hands when connecting them?90 degrees
6. If you do not do the final air brake check for air leaks and fix them before driving,you could lose your brakes while driving.
7. Which type of truck-trailer combination has the greatest chance of a "crack-the-whip" rollover?A tractor pulling three trailers
8. Compared with a straight truck or bus, there are _______ things to inspect in combination vehicles.more
9. If the trailer has antilock brakes (ABS) but the tractor doesn't,the trailer is still less likely to swing out.
10. The safety catch for the fifth wheel locking lever must be _____ for a coupling to be complete.Over the locking lever
11. To drive a triple combination vehicle, you must havea Class A CDL with a doubles/triples endorsement.
12. Low underneath clearance vehicles can be risky at railroad crossings becausethey are more likely to get stuck on raised railroad crossings.
13. To test the tractor protection valve, charge the trailer air brake system, turn off the engine, andstep on and off the brake pedal several times.
14. Under good driving conditions, you should leave at least one second of space between your vehicle and the vehicle ahead for every ___ feet of your vehicle's length.10
15. If you do not do the final air brake check for air leaks and fix them before driving,you could lose your brakes while driving
16. What is a tractor jackknife?When you lock up the drive tires on the tractor and the tractor spins out sideways as the trailer continues to push forward
17. A tractor with a(n) _______ trailer requires the shortest amount of stopping distance.fully loaded
18. Air and electrical lines from the tractor to the trailer should besecured but with enough slack for turns.
19. You should use chocks when parking a trailer without spring brakes becauseif the air supply leaks away, there will be no brakes.

General Knowledge

1. Whenever you stop for a break during your trip, you shouldcheck critical items such as the tires, brakes, and cargo tie-downs.
2. High beams should be:Used whenever it is safe and legal to do so
3. The safety release valve is located on the Air tanks and is used by?Self-operated when the air pressure is above 150 PSI
4. Which of these is a proper use of vehicle lights and flashers?All answers are correct
5. Which of the following is a key steering component?Gear box
6. How can you start moving without rolling backward?Do all of the above.
7. Which is NOT one of the four basic skills that operating a commercial motor vehicle requires?First-aid certification
8. What is the average reaction distance?61 feet
9. The most common cause of serious vehicle skids is:Driving too fast for road conditions
10. The distance that you should look ahead of your vehicle while driving amounts to about _____ at highway speed.1/4 mile
11. You must park on the side of a level, straight, two lane road. Where should you place the three reflective triangles?One within 10 feet of the rear of the vehicle, one about 100 feet to the rear, and one about 100 feet from the front of the vehicle
12. If you are convicted for driving under the influence while driving a commercial vehicle, and this is your first offense, you will most likely get:At least a one-year suspension of your CDL
13. Front end header boards:Protect you from your cargo in case of collision and block the forward movement of your cargo
14. The formula for stopping distance with air brakes is?Perception distance, reaction distance, brake lag distance, and effective braking distance
15. Which of these statements about driving in areas with strong winds is true?Winds are especially a problem when coming out of tunnels
16. Which of these statements about crossing or entering traffic with a heavy vehicle is true?Heavy vehicles need larger gaps in traffic than cars
17. If a vehicle continues to drive in your blind spot you should?Back off
18. You are driving a 40-foot vehicle at 45 mph. Driving conditions are ideal. What is the least amount of space that you should keep in front of your vehicle to be safe?5 seconds
19. Axle weight means the following?The weight transmitted to the ground by one axle or one set of axles
20. The new BAC or blood alcohol concentration for commercial drivers to be considered intoxicated when driving a commercial vehicle is:.04
21. Which of these statements about brakes is true?The heavier a vehicle or the faster it is moving, the more heat the brakes must absorb to stop it
22. Your vehicle is in a traffic emergency and may collide with another vehicle if you do not act. Which of these is a good rule to remember at such a time?Heavy vehicles can almost always turn more quickly than they can stop
23. A moving vehicle ahead of you has a red triangle with an orange center on the rear. What does this mean?It may be a slow-moving vehicle
24. The parking brake should be tested while the vehicle is:Parked
25. A driver's grid log, if required:Must be shown immediately when an officer request it
26. Under-loaded front axles can cause the following:Poor traction
27. What should you do when your vehicle hydroplanes?Release the accelerator
28. You are traveling down a long, steep hill. Your brakes get so hot that they fail. What should you do?Look for an escape ramp or escape route
29. Which of these statements about certain types of cargo is true?Unstable loads such as hanging meat or livestock require extra caution on curves
30. You do not have a hazardous materials endorsement on your commercial driver's license. When can you drive a vehicle hauling hazardous materials?Only when the vehicle does not require placards
31. You should stop driving:When you become sleepy
32. The amount of liquid to load into a tank depends on:All answers are correct
33. The basic two reasons to cover your cargo are 1. to protect the cargo from the weather and 2.All answers are correct
34. There are three types of vehicle inspections, which one is one of them?All answers are correct
35. Inspect your cargo after you have driven50 miles
36. According to the driver's manual, why should you limit the use of your horn?It can startle other drivers
37. Which of these can cause a fire?All answers are correct
38. You are checking your brakes and suspension system for a pre-trip inspection. Which of these statements is true?All answers are correct and true
39. You are driving on a two-lane road. An oncoming driver drifts into your lane and is headed straight for you. Which of these is generally the best action?Steer to the right
40. For an average commercial vehicle, being driven at 55 mph on dry pavement it will take about _____ to bring the vehicle to a stop.More than the length of a football field
41. What happens when tar heats up?It makes the road more slippery
42. In snow and ice, you should reduce your speed by?1/2
43. How many tie-downs are required for a 20-foot load?2
44. It has just reached freezing. Which of the following areas may be slippery?All of the above
45. Which of the following statements about an escape ramp is FALSE?It is not useful if you are traveling too fast.
46. You should inspect wheel bearing seals forleaks.
47. Before transporting a sealed load, you must checkthat you don't exceed gross weight or axle weight limits.
48. While driving at night, which lights should you use as often as you can?High beams
49. If the engine is not overheated, is it completely safe to remove the radiator cap?No.
50. Your emergency kit does NOT need to includea spare jacket.
1. What is counter steering?Turning the wheel in the opposite direction after steering to avoid a traffic emergency
2. You are driving on a straight, level highway at 50 mph. There are no vehicles in front of you. Suddenly a tire blows out on your vehicle. What should you do first?Stay off the brake until the vehicle slows down on its own
3. What is the I.P.D.E. method of driving?Identify, predict, decide, execute
4. Which of these statements about using mirrors is true?There are blind spots that your mirror cannot show you
5. No matter how small the cargo is, it should have at least:Two tie downs
6. You have left the road in an emergency condition, it is impossible for you to come to a stop prior to returning to the road, which of the following is the best action to take?Reduce your speed to 20 mph or less before returning to the road
7. Tie downs must be of the proper type and strength. The combined strength of cargo tie downs must be strong enough to lift.One and one-half times the weight of the cargo tied down
8. Your brakes can get wet when you drive through a heavy rain. What can this cause when the brakes are applied?All answers are correct
9. How far should a driver look ahead of the vehicle while driving?12-15 seconds
10. Which of these statements about speed management is true?All answers are correct
11. You are driving a new truck with a manual transmission. What gear will you probably have to use to take a long downhill grade?A lower gear than you would use to climb the hill
12. How do you correct a rear wheel acceleration skid?Stop accelerating
13. Which of these is a good rule to follow when using a fire extinguisher?Aim at the base of the fire
14. Too much weight on the steering axle can cause the following:All answers are correct
15. Covering the brake means?To have your foot over the brake and ready to push it if necessary
16. Which of these statements about drugs is true?Use of drugs can lead to accidents and / or arrest
17. To prevent shifting, there should be at least one tie down for every _____ feet of cargo.10
18. Where or when should you test the stopping action of your service brakes?When the vehicle is moving at about 5 mph
19. You are driving a heavy vehicle and must exit a highway using an off-ramp that curves downhill. You should:Slow down to a safe speed before the turn
20. When should you wear seat belts?Any time you are in a moving vehicle
21. On which fires can you use the ABC fire extinguisher?All answers are correct
22. Some traffic emergencies may require you to leave the road. Which of these is a good thing to remember?If you must leave the road, try to get all wheels off the pavement or at least one side of vehicle's tires off the road
23. Dry bulk tanks require special care because:Both above
24. What would you use to put out a gasoline fire?Dirt
25. Some liquid tanks are divided into several smaller tanks by:Bulkheads
26. When driving a commercial vehicle with a height over 13 feet you should:If you aren't sure about the clearance, stop and make sure
27. You must inspect your cargo:All answers are correct
28. Cargo covers:All answers are correct
29. Which of these is a good rule to follow when driving at night?Keep your speed slow enough that you can stop within the range of your headlights
30. Stab braking:Involves locking the wheels
31. Your vehicle has hydraulic brakes. While traveling on a level road, you press the brake pedal and find that it goes to the floor. Which of these statements is true?Pumping the brake pedal may bring the pressure up so you can stop the vehicle
32. You are driving a heavy vehicle with a manual transmission. You must stop the vehicle on the shoulder while driving on an upgrade. Which of these is a good rule to follow when putting it back in motion?Use the parking brake to hold the vehicle until the clutch engages
33. If you are being tailgated, you should:Increase the space in front of you
34. You are checking your wheels and rims for a pre-trip inspection. Which of these statements is true?Rust around wheel nuts may mean that they are loose
35. If you are confronted by an aggressive driver, what should you do?Do all of the above.
36. You don't want to be a distracted driver, so youavoid using your cell phone until you reach your destination.
37. What is a common cause of tire fires?Underinflated tires
38. Do empty trucks have the best braking?No.
39. How far ahead should you look while driving?12 to 15 seconds
40. Which of the following should you NOT do if you experience a tire failure?Brake hard and immediately.
41. What might happen if you swing wide to the left before you turn right?Someone might try to pass you on your right.
42. What will help someone who is drunk sober up?Time
43. Total stopping distance equalsperception distance + reaction distance + braking distance.
44. Convex curved mirrorsshow a wider area than flat mirrors.
45. Containerized loadsare typically used for freight carried partway by rail or ship.
46. How many red reflective triangles should you carry?3
47. How does "bleeding tar" affect the road surface and driving conditions?Tar rises to the road surface in very hot weather, causing the roads to become very slippery.
48. Dry bulk tanks and hanging meatare unstable loads.
49. A GPS deviceshould be designed for truck navigation.
50. A major cause of fatal crashes isdriving too fast for road conditions.
1. While driving, ice builds up on your wipers and they no longer clean the windshield. You should:Pull over in a safe place and remove the ice
2. Is it legal to drive with one-fourth of a vehicle's leaf springs broken or missing?No
3. The distance that you should scan ahead in a congested area is about?One block
4. A vehicle is loaded with very little weight on the drive axle. What may result:Poor traction
5. Truck escape ramps:Are designed to protect vehicles from damage
6. What effects can wet brakes cause?Brakes can grab or become weak.
7. When you check the condition of visible parts during your pre-trip inspection, make sure that the ___________ are secured against snagging, rubbing, or wearing.air lines and electrical wiring
8. You do not have a Hazardous Materials Endorsement on your commercial driver's license. You can drive a vehicle hauling hazardous materials whenthe vehicle does not require placards.
9. Which of the following violations at railroad crossings can lead to loss of your CDL for at least 60 days?Both of the above
10. When should you check your mirrors for a lane change?Both of the above
11. On which fires can you use the ABC fire extinguisher?Both of the above
12. Which of these tells you that cargo contains hazardous materials?Both of these answers are correct.
13. Which of these statements about speed management is true?Both of the above answers are true.
14. Which of these is NOT required knowledge for drivers needing a HAZMAT endorsement?Basic chemistry
15. Which of these statements is true about medicines used to treat the common cold?They often make you sleepy. Therefore, they should not be used while driving.
16. Which of these statements is true about other drivers?Short-term or daily rental truck drivers are often not used to the limited vision and pose a hazard.
17. Which of these statements is NOT true about engine belts in hot weather?Cracking is likely to occur, but it is not a safety threat.
18. Which of these statements is true about warning other drivers of a stopped vehicle?Move the rear reflective triangle back if the driver's vision is obscured to within 500 feet.
19. Which of these is NOT a good rule to follow when caring for the injured at an accident scene?Allow injured persons to become chilled or overheated.
20. Which of the following statements is true?Many heavy vehicle accidents occur between midnight and 6 a.m.
21. Which of these statements is NOT true about bad weather driving conditions?As rain continues, the road becomes more slippery than it was when the rain began.
22. What does "axle weight" mean?The weight transmitted to the ground by one axle or one set of axles
23. With a BAC of _____, most people lose consciousness, and some die.0.4
24. Loads that are over-length, over-width, or overweight may requireboth of the above
25. When getting in to start the engine and inspect inside the cab, you mustBoth of the above
26. Which of these is NOT something you should do if your headlights are not working properly?Leave your high beams on.
27. Name some suspension system defects.Both of the above
28. What's the safest way to use turn signals when you intend to turn?Do both of the above
29. Which of these is especially true about your tires in hot weather?You should check tire mounting and air pressure before driving.
30. What should you do if a car coming toward you at night keeps its high beams on?Look toward the right edge of your lane or the right edge of the road.
31. When you're driving in cold weather, your tires mustprovide enough traction to steer and push the vehicle through snow.
32. When driving in an area with few streetlights on a clear night, if you cannot see well with your headlights, you shoulduse your high beams when legal and keep your interior lights off.
33. When a doctor prescribes medication for you and you know you will be driving, you shouldask the doctor if the medication will affect your ability to drive.
34. What does "communicating" mean in safe driving?Letting other drivers know you're there
35. What is the proper way to hold the steering wheel?Firmly, with both hands-on opposite sides of the wheel
36. When inspecting mirrors and windshields for cracks, dirt, illegal stickers, and other obstructions to your vision, you shouldclean and adjust as necessary.
37. When you are passing another vehicle, pedestrian, or bicyclist, you should assume that theymay move into your traffic lane.
38. What should you do before driving if you are sleepy?Get some sleep.
39. If you must stop on a road or the shoulder of any road, you must put out your emergency warning devices withinten minutes.
40. Trucks and buses are subject to certain laws, restrictions, and regulations. Which of these statements is true?Laws and restrictions can vary from place to place.
41. To prevent brake fade, you shouldselect a gear that will keep your vehicle at a safe speed on steep downgrades.
42. You are driving a new truck with a manual transmission. To take a long, steep downhill grade,use a lower gear than you would use to climb the hill.
43. Which of the following is true about a vehicle with a high center of gravity?The cargo should be rearranged so that the heaviest parts of the cargo are under the lightest parts.
44. One can recognize hazardous materials by looking at the container'slabel
45. Optional safety equipment may include emergency phone numbers, tire chains, andtire changing equipment.
46. The best way to stop all skids is torestore traction to the tires.
47. If your brakes get wet on a rainy day, what can result?Reduced braking power
48. Implied consent means that when you operate a CMV on public roads, youconsent to be tested for alcohol in your blood.
49. It takes the body about _____ hours to get rid of the alcohol in four drinks.4
50. Heavy vehicles must sometimes travel more slowly than other traffic. Which of these is NOT a good rule to follow when you are driving such a vehicle?Signal other drivers when it is safe for them to pass you.
1. You must park on the side of a level, straight, four lanes, divided highway. Where should you place the three reflective triangles?One within 10 feet of the rear of the vehicle, one about 100 feet to the rear, and one about 200 feet to the rear
2. A stale green light means?The light ahead has been green for quite a while
3. A vehicle is loaded with most of the weight on the steering axle. What may result?Hard steering and possible breakdown
4. When approaching a curve, you should:Downshift before entering the curve and accelerate slightly as you go through it
5. Should the pre-trip inspection report from the last driver be reviewed during your pre-trip inspection?Yes
6. The load means the following?The maximum safe weight a tire can carry at a specified pressure
7. On average, the total stopping distance with air brakes is?Approximately 450 feet
8. To correct a rear wheel or drive wheel braking skid, you should:Release brakes and counter steer
9. Which of the following is NOT something you should check during a trip?Text messages
10. Which of these is NOT part of the basic method for shifting up?Accelerating while pressing the clutch and turning toward the driver's side
11. You should put the starter switch key into your pocket while you perform the pre-trip inspection becausesomeone could start and move the truck.
12. What is the best way to figure out how many seconds of following distance you have?Wait until the vehicle ahead of you passes a shadow or landmark. Then count the seconds until you reach it.
13. Signs of distracted drivers includedrivers having conversations with passengers.
14. The most important hand signal that you and a helper should agree on is"Stop."
15. If you have been drinking alcohol, before you drive, you shouldwait for it to wear off.
16. Blocking the cargo to keep it from shifting must be doneat the front, back, and/or sides of a piece of cargo.
17. Every time you park your vehicle and shut the engine off, you shouldapply the parking brake.
18. If you are being tailgated, you shouldincrease your following distance.
19. How long does it take a typical tractor-trailer to clear a single railroad track? A double railroad track?It takes 14 seconds to clear a single track and more than 15 seconds to clear a double track.
20. How can you test the parking brake?Set the parking brake and pull forward gently.
21. To safely adjust your speed to current driving conditions, what should you look for ahead?Traffic and road conditions
22. What are some advantages of going right instead of left around an obstacle?Both of these answers are correct.
23. The best drivers are those who watch and prepare for hazards. This is called beingdefensive
24. Is it safe to add coolant to a coolant recovery tank or coolant overflow tank while the engine is at operating temperature?Yes, as long as the engine isn't overheated.
25. Name some important steering system parts.Tie rod, spindle, and pitman arm
26. If you need to leave the road in a traffic emergency, you shouldavoid braking until your speed has decreased to about 20 mph.
27. Under federal regulations, if a vehicle is carrying a load that is more than two feet wide and extends more than four feet beyond the rear of the vehicle, _________ must be placed at the extreme end of the load.two red flags
28. When driving on grades, which of these is the best choice for a safe speed?Based on your vehicle and its cargo, select a speed that is safe within the posted limit.
29. When approaching a traffic light that has been green for a long time, you shouldstart to slow down so you will be ready to stop.
30. What is the first thing you should try to do if your brakes fail while driving downhill?Get off the road as soon as possible.
31. What is the definition of "sleep debt?"The cumulative effect of not getting enough sleep
32. Which of these items is NOT checked on a pre-trip inspection?Amount of fuel in the vehicle
33. You should check the following for looseness, sticking, damage, or improper settingsboth of the above.
34. Which of these statements is NOT true?A drinker can control how fast his or her body absorbs and gets rid of alcohol.
35. What is/are the important reason(-s) for doing a vehicle inspection?Both of the above
36. You should schedule your drivingfor the hours you are normally awake.
37. Which of these is NOT a proper use of vehicle lights?Flashing your brake lights to stop someone from tailgating
38. Which of these statements about drinking alcohol is true?A few beers have the same effect on driving as a few shots of whisky
39. Which of these statements about using turn signals is true?When turning, you should signal early
40. If an automatic transmission is forced into a lower gear while driving, what is not affected on a downgrade?Steering
41. Over length, over width, and overweight loads require:All answers are correct
42. When roads are slippery, you should:Make turns as gently as possible
43. Which of these is not a danger when an automatic transmission is forced into a lower gear at a high speed?Loss of steering control
44. What are the proper collision procedures that are required for any collision in which you are involved but not seriously injured?Both of the above are required procedures
45. The Commercial Driver's Handbook suggests several things to do when you pass a vehicle. Which of these is NOT one of them?Constantly blow your horn while passing the vehicle.
46. Which of these statements about managing space to the sides is true?You should avoid traveling next to others whenever possible.
47. Which of the following statements about backing is true?Both of the above are true.
48. What is black ice?A thin layer of ice clear enough that you can see the road underneath it
49. You should try to park your vehicle so thatyou can pull forward when you leave.
50. What checks should you perform on the steering gear box?The steering box should not be missing any nuts, bolts, or cotter keys.
1. What should you do if you get stuck on the railroad tracks?Get out of your vehicle and away from the tracks.
2. What is the minimum tread depth for tires other than front tires?2/32 inch
3. The distance that you should look ahead of your vehicle while driving is about _______ at highway speed.1/4 mile
4. The total weight of the powered unit, the trailer, and the cargo is calledgross combination weight.
5. The reaction distance is the distance traveled from the timethe brain tells the foot to push the brake pedal to the time the foot actually pushes the pedal.
6. In your mirror, you see a car approaching from the rear. The next time you check your mirror, you don't see the car. To change lanes, you shouldwait until you are sure the car isn't in your blind spot.
7. Stab brakinginvolves steady pressure on the brake pedal without locking the wheels.
8. Can federal inspectors inspect your truck or bus?Yes, and they might place it out of service.
9. If you are driving a long distance, you shouldstop often and take short breaks before you feel really drowsy or tired.
10. If you have a heavy load that is slowing you down on an upgrade, you shouldshift into a lower gear.
11. Cargo that can shift should have at least __ tie-down(s).2
12. Converter dollies built on or after March 1, 1998 are required to have anti-lock brakes. These dollies will havea yellow malfunction lamp on the left side of the dolly.
13. Why is it important to use a helper when backing?Because you have blind spots
14. How long does it take a typical tractor-trailer to clear a double railroad track?More than 15 seconds
15. What is the definition of a hazard?A road user or road condition that presents a possible danger
16. To maintain alertness on your trips, you shoulddo all of the above.
17. Where should you place your warning devices if you must stop on a one-way road or divided highway?10 feet, 100 feet, and 200 feet toward approaching traffic
18. Letting the air out of hot tiresis a bad idea because when the tires cool off, the pressure will be too low.
19. If you are traveling at 55 mph in a 30-foot vehicle, you should leave how many seconds of following distance?4 seconds
20. You are checking your tires for a pre-trip inspection. Which of these statements is true?Tires of mismatched sizes should not be used on the same vehicle
21. To give adequate warning when passing someone, you should?Tap the electrical horn first
22. The purpose of a baffle is to:Control the load surge
23. Which of these statements about staying alert is true?The only thing that can cure fatigue is sleep
24. Which of these items is checked in a pre-trip inspection?All answers are correct
25. Brake fade:Can be caused by the brakes becoming too hot
26. Retarders:Can cause the vehicle to skid when the road is slippery
27. The first step to take if your vehicle catches fire while driving is:Get the vehicle off the road and stop in an open area
28. You are driving in the right lane of a four-lane undivided road, you come over a hill and find a car stopped ahead in your lane. You do not have room to stop, and the hill blocks your view to the rear. Which of these is most likely the best action to take?Steer to the right
29. Which of these tell you that cargo contains hazardous materials?All answers are correct
30. Medical certificates must be renewed every:Two years
31. Which of these statements about overhead clearance is true?A vehicle's clearance can change with the load carried
32. If you are stopped at a roadside rest and found to have a BAC or blood alcohol concentration of .02 you will:Be placed out of service for 24 hours
33. You should avoid driving through deep puddles or flowing water. But if you must, which of these steps can help keep your brakes working?Gently pressing the brake pedal while driving through the water
34. Which of these describes how you should use the brake pedal on a steep downhill grade?Release the brake when you are 5mph below your safe speed, then let your speed come back up to your safe speed and repeat.
35. Which of these statements about backing a heavy vehicle is true?All answers are correct are true
36. An en-route inspection should include checking:All answers are correct
37. To avoid a crash, you had to drive onto the right shoulder. You are now driving at 40 mph on the shoulder. How should you move back onto the pavement?Come to a complete stop if possible, before steering back onto the pavement
38. What is average effective braking distance time?216 feet
39. Overloading can have a bad effect on?All answers are correct
40. "Reaction distance" is the distance traveled from the time:The brain tells the foot to push the brake pedal to the time the foot pushes the pedal
41. Controlled braking:Is used to keep a vehicle from skidding
42. Retarders:Can cause the vehicle to skid when slippery
43. You are starting your vehicle in motion from a stop, as you apply power to the drive wheels they start to spin. You should:Take your foot off the accelerator
44. Where should your ignition key be during your pre-trip inspection?In your pocket
45. When driving in fog, you should be going?Only fast enough so that you can stop within the distance that you can see ahead
46. Which of these is a good rule to follow when steering to avoid a crash?Don't turn any more than is needed to clear what is in your way
47. Every time you park your vehicle and shut the engine off you should:Apply the parking brake
48. Which item below lists almost all or all the emergency equipment that is required on a school bus?A fire extinguisher, spare electrical fuses, road flare (fusees) or triangles, emergency kit, and body fluid cleanup kit.
49. The key principle in balancing cargo weight is to keep the load:Balanced in the cargo area
50. Which of these can help you stay alert while driving?Taking short breaks before you are drowsy
1. When checking the bus seats, what are you looking for?All answers are correct
2. You are checking your steering and exhaust systems for a pre-trip inspection. Which of these statements is true?Steering wheel play of more than 10 degrees can make it hard to steer
3. If you have a hazardous fire, you should?Call the proper authorities
4. Blocking your cargo to keep it from sliding must be done:All answers are correct
5. You should use your mirrors to check:All answers are correct
6. For your safety, when setting out reflective triangles you should:Hold the triangles between your body and oncoming traffic
7. What is the average perception distance?142 feet
8. Which of these pieces of emergency equipment should always be carried in your vehicle?All answers are correct
9. Which of these statements about accelerating is true?Improper acceleration can cause mechanical damage
10. The most important reason for being alert to hazards is so:You will have time to plan your escape if the hazard becomes an emergency
11. Which of these statements about downshifting for a long downhill grade is true?It allows engine compression and friction to help the brakes slow the vehicle
12. Whether you load and secure your load yourself, you are responsible for:All answers are correct
13. You are checking your tires for a pre-trip inspection. Which of these statements is true?Tires of mismatched sizes should not be used on the same vehicle
14. Cargo inspections:Should be performed after every break you take while driving
15. Which of these will help keep an engine cool in hot weather?All answers are correct
16. You must park on the side of a level, straight, two lane road. Where should you place the three reflective triangles?One within 10 feet of the rear of the vehicle, one about 100 feet to the rear, and one about 100 feet from the front of the vehicle
17. Hazardous materials placards aresigns on the outside of the vehicle that identify the hazard class of the cargo.
18. The minimum tire tread depth for front tires is4/32 inch.
19. An antilock braking system (ABS) willkeep your wheels from locking when you brake hard.
20. Which of the following statements about retarders are correct?All of the above statements are correct.
21. You are driving a heavy vehicle and must exit a highway using an off ramp that curves downhill. You shouldslow down to a safe speed before taking the curve.
22. According to the driver's manual, why should you limit the use of your horn?It can startle other drivers.
23. If you do not have a CB radio, what is the first thing you should do at an accident scene?Protect the accident scene.
24. The oil pressure gauge should come up to normal within how long after starting the engine?Seconds
25. The distance your vehicle travels from the time your eyes see a hazard to the time your brain recognizes it is called _______ distance.perception
26. Stab braking should not be used on vehicles withanti-lock brakes.
27. When should you downshift an automatic transmission?When going down grades
28. What is a "pull-up?"Pulling forward while backing a trailer to reposition it
29. When must you wear a seat belt?Whenever you're driving a CMV
30. When you drive in the mountains, you will have to use lower gears to drive safely down grades. Which of these does NOT affect your choice of gears?Type of tire tread
31. Serious traffic violations that can cause your CDL license to be suspended includeboth of the above.
32. There are certain types of vehicle inspection, includingpost-trip, pre-trip, en-route.
33. Why should you signal continuously while turning?Both of the above are correct.
34. You are driving on a two-lane road. An oncoming vehicle drifts into your lane and is headed straight for you. Which of the following should you do?Steer to the right.
35. Which of these statements is true about causes of vehicle fires?Poor trailer ventilation can cause flammable cargo to catch fire.
36. What three things related to cargo are the driver's responsibility?Inspecting the cargo, recognizing overloads, and properly securing the cargo
37. What is your most valuable way to see the sides and rear while driving?Check your mirrors regularly.
38. When checking lights, you shouldBoth of these answers are correct.
39. On a two-way, two-lane road, if you must stop on a hill, how far back should you place your reflective triangles?Within 500 feet behind the vehicle
40. Name some things you should check on the FRONT of your vehicle during your pre-trip inspection.Low beams, high beams, four-way flashers, and turn signals
41. A vehicle is loaded with most of the weight on the steering axle. What may result?Hard steering and possible damage to the tires
42. Which of the following best describes how sleep debt can be paid off?It can only be paid off by sleeping.
43. How can you avoid wet brake problems?Slow down, shift to a low gear, and gently apply the brakes.
44. When you start to drive down a steep downgrade, which of the following should influence your choice of speed?All of the above
45. Always try to back toward the driver's side becauseyou can see better, watching the vehicle's rear from the side window.
46. On which of the following types of fires should you NOT use a B:C fire extinguisher?Wood
47. You do not have a hazardous materials endorsement on your commercial driver's license. You are asked to haul hazardous materials in a placarded vehicle. You should:Refuse to haul the load
48. You are testing the stopping action of service brakes on a hydraulic system. Which of these can mean there is a problem?All answers are correct
49. The center of gravity of a load:Can make a vehicle more likely to tip over on curves
50. As part of your pre-trip inspection; you mustAll answers are correct
1. Which of these statements about double clutching and shifting is true?You can use the tachometer to tell you when to shift
2. Gross combination weight rating or GCWR means the following?The total weight of a powered unit plus trailer(s) plus the cargo
3. Which of these statements about managing space is true?When the road is slippery you should keep more space in front of your vehicle
4. The road you are driving on becomes very slippery due to glare ice, which of these is a good thing to do in such a situation?Stop driving and park where it is safe to do so
5. Which of these statements about downshifting is true?When you downshift for a curve, you should do so before you enter the curve
6. If a straight vehicle goes into a front wheel skid it will:Go straight ahead even if the steering wheel is turned
7. Which of these statements about cold weather driving is true?Windshield washer antifreeze should be added to the washer reservoir
8. Retarders are used by?Exhaust, electrical, hydraulics, and engine
9. You must drive on a slippery road. Which of these is a good thing to do in such a situation?Slow down gradually
10. Which of these is a sign of tire failure?All answers are correct
11. Which of these statements about marking a stopped vehicle is true?If a hill or curve keeps drivers behind you from seeing the vehicle within 500 feet, the rear reflective triangle should be moved back down the road to give adequate warning
12. Which of these is a good driving rule for work zones?All answers are correct
13. To transport cargo safely, which of the following are you NOT responsible for?Ensuring the freshness of sealed cargo
14. Which of the following CMVs are most likely to get stuck at a raised railroad crossing?All of the above
15. All of the following behaviors are signs of aggressive driving EXCEPTfrequent changes of speed.
16. Which of these statements about escape ramps is true?All answers are correct and true
17. How often must you stop to check your cargo while on the road?All of the above
18. Bridge formulas permitless maximum axle weight for axles that are close together.
19. As your blood alcohol concentration (BAC) rises, what happens?Judgment and self-control are affected.
20. Which of these statements about cargo loading is true?State laws dictate legal weight limits
21. What is the most important thing to remember about emergency braking?If the wheels are skidding, you cannot control the vehicle
22. What are the regulations on the height of splash guards?It depends on the state.
23. The tendency for long commercial vehicles to swing wide on turns is calledoff-tracking.
24. What is hydroplaning?When the tires skim over the road surface
25. When driving a commercial vehicle with a height over 13 feet, you shouldstop and make sure if you aren't certain that a clearance is high enough.
26. Your blood alcohol concentration (BAC) depends on yourbody weight.
27. The purpose of retarders is tohelp slow the vehicle while driving and reduce brake wear.
28. Which of the following provide extra gears on some trucks?Both of the above
29. Which one of these is not part of the engine compartment pre-trip inspection?Valve clearance
30. Which of these statements about drinking alcohol is true?All answers are correct
31. How do you test hydraulic brakes for leaks?With the vehicle stopped, pump the pedal three times; apply firm pressure for 5 seconds, then hold and see if the pedal moves
32. You are checking your brakes and suspension system for a pre-trip inspection. Which of these statements is true?All answers are correct and true
33. Which of the following is most likely to cause a vehicle fire?Short circuits and loose connections
34. If the vehicle in front of you is smaller than yours, it can probablystop faster than you.
35. How far ahead should you be looking while driving in town?1 block
36. Name two causes of fires.Underinflated tires and duals that touch
37. When should you review the post-trip inspection report from the previous driver?You should review it during your pre-trip inspection.
38. Which of these statements about speed management is true?You should choose a speed that lets you stop within the distance that you can see ahead
39. While driving, you see a small square cardboard box ahead in your lane. You should:Steer around it when it is safe to do so
40. In which of the following two situations should you downshift?Starting down a hill and entering a curve
41. Axle weight means the following?The weight transmitted to the ground by one axle or one set of axles
42. Which of these can cause the vehicle to skid?All answers are correct
43. When looking ahead of your vehicle while driving you shouldBack and forth, near and far
44. Which of these statements about engine overheating is true?You should never remove the radiator cap on a pressurized system
45. Escape ramps areused to stop runaway vehicles.
46. The braking effect of the engine is greatest when the engine is _____ the governed rpm and the transmission is in the ______ gears.near; lower
47. Which of the following materials can be used in a Class ABC fire extinguisher to put out fires?Dry chemical
48. You are checking your brakes and suspension system for a pre-trip inspection. What are you looking for?Both of the above are correct.
49. How does the height of the vehicle's center of gravity affect safe handling?Trucks with a high center of gravity can roll over at the posted speed limit for a curve.
50. In rain, you should reduce your speed by?1/3
1. Gross vehicle weight rating or GVWR means the following:Total weight of a single vehicle plus its load
2. Which of these statements about tires and hot weather driving is true?You should inspect your tires more often because they are more likely to fail
3. Which of these statements about backing a heavy vehicle is true?You should avoid backing whenever you can
4. Tank vehicles are used to carry any liquid and are dangerous to drive because:High center of gravity and danger of load surge
5. How often should you check your mirrors?Every 8 to 10 seconds
6. How can you determine if your vehicle is equipped with an antilock braking system (ABS)?All of the above can work.
7. If a straight vehicle (no trailer or articulation) goes into a front-wheel skid, it willgo straight ahead even if the steering wheel is turned.
8. When driving at night, use your low beams when an oncoming vehicle is within500 feet.
9. What are some things to do at an accident scene to prevent another accident?Both of the above are correct
10. Why should you be in the proper gear before starting down a hill?You will not be able to shift into a lower gear once you are going down a hill.
11. When driving through roadway work zones, you shouldwatch for sharp pavement drop-offs.
12. To prevent skidding, you shouldadjust to conditions while driving.
13. A car suddenly cuts in front of you, creating a hazard. What should you NOT do?Honk and stay close behind the car.
14. A key principle to remember about loading cargo is to keep the loadbalanced in the cargo area.
15. What can you do at an accident scene to help avoid another accident?Set out warning devices to keep other vehicles from running into the accident scene.
16. As the blood alcohol concentration or BAC goes up, what will happen?The person becomes more dangerous if allowed to drive
17. When does hydroplaning occur?Is more likely if tire pressure is low
18. The height of the vehicle center of gravity is very important for safe handling. A high center of gravity means you are more likely to do the following:Tip over
19. Which of these statements about vehicle fires is true?A burning tire must be cooled
20. Cargo should have at least one tie down for each:10 feet of cargo
21. During a pre-trip inspection you discover an exhaust leak or power steering leak, you should:Report the problem and arrange for another vehicle to use
22. Cargo that is not loaded or secured properly can cause many problems. Which of these statements is true?All answers are correct are true
23. You are driving a vehicle that could safely be driven at 55 mph on an open road. Traffic is now heavy and moving at 35 mph although the speed limit is 55. The safest speed for your vehicle in this situation is most likely:35 mph
24. Name two situations in which the legal maximum weights may not be safe to haul.During bad weather; in mountains
25. What things should you check during a trip?Watch gauges and mirrors and use your senses to check for problems: LOOK, LISTEN, and SMELL.
26. It is important to shift gears correctly to keepcontrol of the vehicle.
27. If you feel drowsy while driving, what should you do?Pull off the road and get some sleep.
28. When the engine is at operating RPM's, the _____ pressure is built up from 80 to 100 PSI within 45 seconds in a dual system?Air
29. You are driving a 40-foot vehicle at 35 mph. Driving conditions are ideal. What is the least amount of space that you should keep in front of your vehicle to be safe?4 seconds
30. Which of the following statements about tank vehicles is true?Special skills are required to haul liquid tanks.
31. Which fires can you use water to put out?Tire fires
32. Which of these is NOT caused by rough acceleration?Tire damage
33. Cargo inspections:Should be performed after every break you take while driving
34. Which of the following should you NOT do in the event of hydraulic brake failure?Shift up.
35. Which of these statements about driving in areas with strong winds is true?Winds are especially a problem when coming out of tunnels
36. You are driving on a straight, level highway at 50 mph. There are no vehicles in front of you. Suddenly a tire blows out on your vehicle. What should you do first?Stay off the brake until the vehicle slows down on its own
37. What is the I.P.D.E. method of driving?Identify, predict, decide, execute
38. Which of these statements about double clutching and shifting is true?You can use the tachometer to tell you when to shift
39. Which of these statements about backing a heavy vehicle is true?All answers are correct are true
40. As the blood alcohol concentration or BAC goes up, what will happen?The person becomes more dangerous if allowed to drive
41. You must drive on a slippery road. Which of these is a good thing to do in such a situation?Slow down gradually
42. Medical certificates must be renewed every:Two years
43. Inspect your cargo after you have driven50 miles
44. You are driving in the right lane of a four-lane undivided road, you come over a hill and find a car stopped ahead in your lane. You do not have room to stop, and the hill blocks your view to the rear. Which of these is most likely the best action to take?Steer to the right
45. The first step to take if your vehicle catches fire while driving is:Get the vehicle off the road and stop in an open area
46. Which of these is a good rule to follow when steering to avoid a crash?Don't turn any more than is needed to clear what is in your way
47. You have left the road in an emergency condition, it is impossible for you to come to a stop prior to returning to the road, which of the following is the best action to take?Reduce your speed to 20 mph or less before returning to the road
48. Where should your ignition key be during your pre-trip inspection?In your pocket
49. Truck escape ramps:Are designed to protect vehicles from damage
50. You are starting your vehicle in motion from a stop, as you apply power to the drive wheels they start to spin. You should:Take your foot off the accelerator

CDL

Air Brakes

Airbrakes #1

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Combination

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General Knowledge

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