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CDL GENERAL KNOWLEDGE TEST (NV) - PRACTICE TEST

21. Which of the following statements about slippery roads is true?
Shady parts of the road provide better traction than open areas.
The road will freeze before bridges will.
On a wet road you should reduce speed by a half or more.
None of the above.
22. The one-way check valve:
keeps the axles in place.
keeps your wheels from locking up when you brake hard.
keeps air from going out if the air compressor develops a leak.
supplies air to the trailer air tanks.
23. Before starting down a hill, you should slow down and shift down:
to a gear that will cause your engine to exceed its redline.
to a speed that you can control without using the brakes hard.
to a gear that will cause your brakes to overheat.
so you can coast downhill.
24. What is a common cause of tire fires?
Duals that touch
Cold tires
Loose lug nuts
All of the above.
25. Heights posted at bridges and overpasses:
are always incorrect.
can be incorrect.
are always accurate.
None of the above.
26. For safety during a trip, you should:
check critical items when you stop.
use your senses to check for problems.
watch gauges for signs of trouble.
All of the above.
27. When you drive a tractor-trailer combination with ABS, you should:
always apply the brakes hard.
apply the trailer hand brake whe braking.
pump the brakes.
brake as you always have.
28. In a dual air brake system, if one air system is very low on pressure:
the effect won't be noticeable for the first 50 miles.
either the front or rear brakes will not be operating fully.
you should drive and brake as you always have.
you should pump the brakes to restore pressure.
29. Stopping distance can be affected by:
Speed
Time of day
Temperature
All of the above.
30. The heavier the vehicle:
the more work the brakes must do to stop it.
the higher the center of gravity will be.
the less work the brakes must do to stop it.
None of the above.
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