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CDL DOUBLES TRIPLES PRACTICE TEST ARIZONA

11. The tractor protection valve:
keeps air in the brake system should the trailer develop a bad leak.
prevents the trailer from being accidentally released.
keeps your wheels from locking up when you brake hard.
12. Enough tread is especially important in winter conditions. You need at least ________ tread depth on steering axle tires.
2/8 inch
4/32 inch
6/24 inch
13. How should you brake if your vehicle loses ABS?
Pump the brake repeatedly
Brake as you always have.
Step on and off the brake pedal several times
14. To know how much space you should keep in front of you:
estimate how many seconds it would take you to reach the vehicle ahead.
estimate how many vehicle lengths there are between you and the vehicle ahead.
wait until the vehicle ahead of you passes a clear landmark, then count off the seconds until you reach the same spot.
15. If you have to drive off the road, you should:
keep one set of wheels on the pavement, if possible.
brake as hard as you can to maintain control.
fully apply the brakes until your speed has dropped to about 20 mph.
16. When coupling a double or triple, ________ should be attached last.
the trailer right behind the cab.
the middle trailer.
None of the above.
17. The best way to recognize that your trailer has started to skid is:
by feeling the brakes come on.
by seeing it in your mirrors.
by recognizing tire failure.
18. If a tire fails while you are driving, you should:
stop on the roadway if possible.
stay off the brake until your vehicle has slowed down.
call your supervisor for instructions.
19. The center of gravity of a trailer should be:
as low as possible.
as high as possible.
at the rear of the trailer.
20. If driving a heavy vehicle, you should:
try to pass other vehicles going uphill.
stay in the right lane.
stay in the left lane.
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