CDL Quiz 11

CDL Quiz 11

1. Which of the following should you do before leaving your vehicle unattended?

Set the parking brakes.

Chock the wheels.

remove the keys.

Do all of the above.

2. What is the best way to test if your vehicleâ€™s spring brakes come on automatically?

Continue to step on and off the brake pedal until the manufacturerâ€™s low psi specification has been met for spring brakes to deploy.

On tractor-trailer vehicles, continue to step on and off the brake pedal until the parking brake valve has popped out.

On single vehicles, continue to step on and off the brake pedal until the parking brake valve has popped out.

All of the above are correct.

3. The tractor protection valve

Will close automatically if the air supply drops to a certain level.

provides the air supply for the brake system.

Will close if you apply the parking brakes.

does all of the above.

4. Which of the following are true about a dual air brake system?

Usually, one system operates the front axle and the other one operates the rear axle.

One system is called the â€œprimaryâ€ system and the other one is called the â€œsecondaryâ€ system.

It uses a single set of brake controls.

All of the above are true.

5. Which of the following is NOT part of the air brake system?

Emergency brake system

Service brake system

Radio signal system

Parking brake system

6. Which of the following can cause brakes to fail or fade?

Excessive use of the service brakes

Not relying enough on engine braking

Brakes being out of adjustment

All of the above

7. Under which conditions are front wheel brakes good?

None

Good weather only

Wet or icy conditions only

All weather conditions

8. Which of the following will be true about your brake function if your anti-lock braking system (ABS) fails?

It will slow your truck to a halt and force you to pull over.

It may cause problems with other mechanical systems and possibly pose a huge fire risk.

You will still have normal brake function and will just need to get the ABS repaired soon.

You will have no brake function and the truck will be out of control.

9. After the initial drop, the maximum acceptable leakage rates per minute are

3 psi for single vehicles and 4 psi for combination vehicles.

5 psi for single vehicles and 10 psi for combination vehicles.

1 Psi for single vehicles and 3 psi for combination vehicles.

5 Psi for single vehicles and 6 psi for combination vehicles.

10. When should you drain your air tanks?

At the end of the month

At the end of each working day

At the end of the fiscal quarter

At the end of a trip

11. If the air tanks are not drained,

You will drive too quickly.

Your transmission fluid may drain out.

Your left brake will cease to operate.

Your brakes may fail because of water freezing.

12. Spring brakes are

Brakes that come on automatically on a truck or tractor when the psi drops too low.

Not going to take full effect until your psi drops to a certain range, typically 20 to 30 psi.

Made up of powerful springs that are held back by air pressure while you are driving.

All of the above.

13. The purpose of a supply pressure gauge is

To tell you how hot the air in the tank is.

To warn you only if there is too little air in the tank.

To tell you how much air is in the tank.

All of the above.

14. Which of the following is NOT part of the braking process when driving a tractor-trailer combination vehicle with an anti-lock braking system (ABS)?

When you slow down, you should monitor your tractor and trailer and ease off the brakes to keep control.

Brake the same way no matter what youâ€™re driving: a vehicle with ABS, a vehicle with a trailer, or something else.

You should use only the braking necessary to stay safely in control.

You should drive faster so that you will be able to keep the trailer and tractor straight.

15. Which of the following is NOT part of the drum brake?

Safety valve

Slack adjuster

Axle

Brake drum

16. How do brakes work on a long, steep downgrade?

They work as the main braking mechanism with the engine braking effect as an emergency backup.

They work as a supplement to the braking effect of your engine.

Not applicable; no braking effect is involved in a downgrade.

They work as the main braking mechanism.

17. Why must you study air brakes in the state of Indiana?

Otherwise, you will not be able to get a CDL at all.

All trucks have air brakes in Indiana.

Otherwise, you will have to get a CDL with restrictions.

Otherwise, you will only be able to receive a CDL permit.

18. How can you tell if your vehicle is equipped with an anti-lock braking system (ABS)?

ABS is still optional.

The vehicle was manufactured after 1998.

The vehicle was manufactured after 2000.

The vehicle was manufactured after 2010.

19. What is the best way to test your vehicleâ€™s low air pressure warning signal?

Pump the brakes until the air pressure drops below 30 psi.

Pump the brakes while your vehicle is fully on.

With the engine off, step on and off the brake pedal to lower the air pressure below 60 psi.

Manually let the air out of your brakes and see if the signal comes on.

20. Which vehicles must have low air pressure warning signals?

Only those built after 2005

All vehicles with air brakes currently in operation

None (warning signals are optional)

Only those built after 2010

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