SD CDL Practice Test - General Knowledge
21.
The safety valve installed in the first tank the air compressor pumps air is set to open:
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if there is too much pressure.
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at 30 psi.
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every 15 minutes.
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if there is too little pressure.
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22.
The air compressor governor:
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stops the compressor from pumping air.
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controls when the air storage tanks will pump air into the air compressor.
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allows the compressor to start pumping air when the tank pressure rises to the "cut-out" pressure.
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All of the above.
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23.
When driving trucks with trailers, drivers should:
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avoid making sudden movements with the steering wheel.
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push the brake pedal to the floor when braking.
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make quick lane changes.
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decrease their following distance.
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24.
If driving a new vehicle, you should familiarize yourself with the controls and equipment:
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as you drive.
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within the first 50 miles.
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after pulling into a service station.
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before you start driving.
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25.
If driving a heavy vehicle, you should:
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try to pass other vehicles going uphill.
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stay in the left lane.
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avoid braking.
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stay in the right lane.
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26.
The most common cause of skidding is:
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black ice.
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spilled oil.
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driving too fast for conditions.
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surface water.
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27.
Why should you back toward the driver's side?
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Backing toward the right side is dangerous.
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You can watch the rear of your vehicle by looking out the side window.
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You can see better.
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All of the above.
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28.
When driving on wet roads, you should reduce your speed by about:
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one-fifth.
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one-quarter.
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one-half.
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one-third.
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29.
Heights posted at bridges and overpasses:
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are always accurate.
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are always incorrect.
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can be incorrect.
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None of the above.
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30.
Air pressure should build up in a single air system, within about:
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15 minutes.
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3 minutes.
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1 minute.
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10 minutes.
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