SD CDL GENERAL KNOWLEDGE TEST - CDL PRACTICE TEST
21.
Service lines are often coded with the color ____ to keep from getting them mixed up with the emergency line.
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yellow
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orange
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blue
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red
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22.
When checking the condition of the visible parts during your pre-trip inspection, make sure that the _________ are secured against rubbing, snagging or wearing.
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air lines and electrical wiring
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reflectors
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side boards and stakes
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tailboards
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23.
If your vehicle has power steering, during your pre-trip external inspection you must check that:
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there's a function light.
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there are no power steering fluid leaks or damage to the power steering hoses.
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the engine rpm is down close to
idle.
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there are 2 lit red lights indicating it's there.
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24.
A passive railroad crossing is one that:
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does not have any type of traffic control device.
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has a traffic control device installed at the crossing to regulate traffic.
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requires you to stop and wait until the traffic control device installed at the crossing tells you to proceed.
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has at least two traffic control devices installed at the crossing to regulate traffic.
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25.
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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follow the vehicle in front of you.
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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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26.
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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27.
When a vehicle is hydroplaning:
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the clutch is stuck.
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the tires lose their contact with the road.
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the spray from large trucks reduces visibility.
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your brakes won't work.
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28.
When checking the engine compartment in a vehicle inspection, you should check all of the following except:
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Engine oil level
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Coolant level in radiator
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Shock absorbers
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Windshield washer fluid level
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29.
Blocking _______________ to keep it from sliding.
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is used only in the back of a piece of cargo
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is used in the front, back, and/or sides of a piece of cargo
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goes from the upper part of the cargo to the floor
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None of the above.
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30.
If the engine catches fire, you should:
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pull into a service station and notify the emergency services.
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avoid shooting foam from the vehicle's underside.
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open the hood as soon as you can.
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turn off the engine as soon as you can.
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