CDL COMBINATION PRACTICE TEST (ID)

11. By pushing the trailer air supply control knob in, you:
supply the trailer with air.
supply the tires with air.
shut the air off and put on the trailer emergency brakes.
12. If driving a new vehicle, you should familiarize yourself with the controls and equipment:
as you drive.
within the first 50 miles.
before you start driving.
13. Which of the following is NOT part of testing the tractor protection valve?
Charging the trailer air brake system.
Pulling forward slowly, then applying the trailer brakes.
Stepping on and off the brake pedal several times to reduce the air pressure in the tanks.
14. In vehicles with air brakes, the tractor protection valve:
carries air, which is controlled by the trailer hand brake or the foot brake.
provides the air pressure used to operate trailer brakes.
keeps air in the tractor or truck brake system.
15. Which of these statements is true?
Large combination vehicles take longer to stop when they are fully loaded than when they are empty.
"Bobtail" tractors can take longer to stop than a combination vehicle loaded to maximum gross weight.
Trailer skids are more likely to happen when the trailer is empty or lightly loaded.
16. Overloading can have negative effects on:
braking.
steering.
All of the above.
17. When should you use chocks to park a trailer without spring brakes?
Only when parking downhill
Never
Always
18. Which of the following is NOT a good rule for using turn signals?
Put your turn signal on after the turn.
Signal continuously until you have completed the turn.
Cancel your signal after you have turned.
19. If the drive wheels begin to spin when accelerating, you should:
brake gently.
take your foot off the accelerator.
continue to accelerate.
20. When backing a trailer, you should:
pull-up frequently to reposition the vehicle.
not back up in a straight line.
turn the steering wheel toward the direction you want to go.
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