MD CDL GENERAL KNOWLEDGE TEST - CDL PRACTICE TEST
21.
The use of brakes on a steep downgrade is:
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a supplement to the braking effect of the engine.
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dangerous, and should be avoided at all costs.
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much more effective than the engine braking effect.
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the main braking factor.
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22.
If a trailer does not have spring brakes, to keep the trailer from moving you should:
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close the brake valve.
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use wheel chocks.
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use the service brakes.
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park on a slight decline.
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23.
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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24.
An item that is 15 feet long placed on a flatbed trailer should have at least:
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1 tie-down.
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15 tie-downs.
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2 tie-downs.
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3 tie-downs.
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25.
Unless excepted, shipping papers must list:
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an emergency response telephone number.
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the address of the driver.
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a proper description of the truck.
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the colors of the materials.
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26.
How do you put on the parking brake on newer vehicles?
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By pushing in Push in a diamond-shaped yellow knob.
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By move a yellow lever to the left.
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By pulling out a diamond-shaped yellow knob.
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By using a round yellow knob.
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27.
Hydroplaning:
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can occur at speeds as low as 30 mph.
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only happens when tire pressure is higher than normal.
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never occurs at speeds below 40 mph.
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only occurs at extremely high speeds.
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28.
If you are feeling drowsy, before driving you should:
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wait at least 30 minutes.
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drink some coffee.
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get some sleep.
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drink soda.
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29.
Escape ramps are:
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reserved for vehicles carrying dangerous goods.
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used to stop runaway vehicles safely.
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reserved for combination vehicles.
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used by vehicles exiting the expressway.
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30.
Front brake limiting valves were used to:
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reduce your speed so further braking or shifting is not required.
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prevent overheating of the front tires.
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reduce the chance of the front wheels skidding on slippery surfaces.
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reduce exhaust emissions.
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