CDL PRACTICE TEST (OR) - GENERAL KNOWLEDGE TEST
21.
On
a tractor-trailer equipped with a trailer brake hand
valve, the hand valve can be used to:
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hold compressed air.
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keep from rolling back.
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prevent movement of cargo.
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reduce the chance of the front wheels skidding.
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22.
Weight that is loaded so there is a high center of gravity:
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makes a vehicle easier to handle.
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causes greater chance of rollover.
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reduces the chance that the load will shift to the side or fall off.
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All of the above.
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23.
Which of the following is NOT a reason for hydraulic brake failure?
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Brake fade on long hills
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Loss of hydraulic pressure
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Stab braking
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All of the above.
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24.
If you are feeling sleepy, you should:
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pull off the road and rest.
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get some coffee.
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slow down.
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drive faster.
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25.
When your rear wheels lock up, you may:
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gain better control of the vehicle.
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skid, jackknife, or spin
the vehicle.
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lose steering control.
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All of the above.
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26.
When driving in work zones you should:
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Drive slowly and carefully.
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Use your four-way flashers or brake lights to warn drivers behind you.
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Observe the posted speed limits at all times.
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All of the above.
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27.
The minimum tire tread depth for all tires other than front tires is:
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4/32 inch
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1/32 inch
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6/32 inch
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2/32 inch
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28.
In mountain driving, to select a safe speed you should:
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go slightly faster than the speed limit.
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go 5 mph slower than the vehicle ahead.
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select a speed that's not too fast for the weight of your vehicle and cargo, the length and steepness of the grade, and road and weather conditions.
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follow the vehicle in front of you.
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29.
If are being followed closely, you should:
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flash your brake lights.
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increase your following distance.
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decrease your following distance.
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change lanes quickly.
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30.
When driving, you should:
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avoid using your mirrors to spot overtaking vehicles.
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avoid checking your mirros often.
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use your mirrors only when changing lanes.
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check your mirrors regularly.
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