CDL COMBINATION PRACTICE TEST (VA)

11. The wheels of a large combination vehicle are more likely to lock up when:
the vehicle is lightly loaded.
the trailer has new tires.
the vehicle is heavily loaded.
12. If the fifth-wheel locking lever is not locked after the jaws close around the kingpin:
the parking brakes are on and the wheels are chocked.
the parking brakes are on and your vehicle is safe to drive.
the coupling is not right and you should not drive until you get it fixed.
13. The service line:
carries air to the parking brake to control the trailer brakes.
carries power steering fluid to control the trailer brakes.
carries air and is connected to relay valves which allow the trailer brakes to be applied more quickly.
14. Which of the following is NOT part of the procedure to raise the landing gear?
Raising the landing gear all the way up
Using the high range gear, if equipped, to begin raising the landing gear
Safely securing the crank handle, after raising the landing gear
15. To avoid rollovers, you should drive slowly:
around corners.
on ramps.
All of the above.
16. If a load is 50 feet long, the minimum number of tie-downs required is:
10
5
4
17. What is the emergency air line for?
It supplies air to the trailer air tanks, and controls the emergency brakes on combination vehicles.
It tells you the amount of brake pressure you need to stop the vehicle.
It controls the front brakes of the tractor in case of an emergency.
18. When you make a quick lane change, the crack-the-whip effect can:
make it harder to turn without skidding.
improve your traction.
turn the trailer over.
19. The best way to recognize that your trailer has started to skid is:
by seeing it in your mirrors.
by hearing squeaking noises from the wheels.
by using retarders.
20. If your vehicle catches fire, you should pull over:
near trees.
in an open area.
at a service station.
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