NV CDL Combination Practice Test (2024)

1. During a trip:

you should watch gauges to make sure that valve caps are not missing.
you should not watch gauges as they can be misleading.
you should watch gauges for signs of trouble.
None of the above.

2. If your vehicle is equipped with air brakes, loss of air pressure in the emergency line will cause:

the vehicle to slide back and forth.
the trailer supply valve to open.
the trailer emergency brakes to come on.
the springs to put on the brakes.

3. Never drive with landing gear only part way up. Why?

It must be exactly 5 feet off the ground.
It may catch on railroad tracks.
It may be harder to use.
It makes it harder to brake.

4. Which of these statements about brakes is true?

To stop, the brake shoes and linings are pushed against the outside of the drum.
Brake fade does not result from excessive heat.
The lighter the vehicle, the more heat the brakes absorb to stop it.
None of the above.

5. When more cargo is piled up in a truck, the center of gravity moves:

6. Most hydraulic brake failures occur for one of two reasons, one of which is:

loss of hydraulic pressure.
relying too much on the engine braking effect.
excessive downshifting.
driving in cold weather.

7. You supply air to the trailer brake system by:

pulling out the trailer air supply valve.
plugging the electrical cord into the trailer.
connecting the tractor service air line to the trailer service glad hand.
pushing in the trailer air supply knob.

8. If the ABS is not working:

the vehicle will have weak brakes.
the vehicle will have no brakes.
you still have normal brake functions.
None of the above.

9. What is the minimum tread depth for tires other than front tires?

10. When you drive a tractor-trailer combination with ABS, you should:

always apply the brakes hard.
brake as you always have.
apply the trailer hand brake whe braking.
pump the brakes.

CDL COMBINATION PRACTICE TEST (NV)