CDL PRACTICE TEST (PA) - GENERAL KNOWLEDGE TEST
21.
Broken suspension parts can be very dangerous. When inspecting your vehicle for suspension system defects, look for:
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Broken leaves in a multi-leaf spring.
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Damaged air suspension systems.
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Spring hangers that allow movement of axle from proper position.
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All of the above.
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22.
If you experience a loss of hydraulic pressure, you should do all of the following except:
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Use the parking brake
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Downshift
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Put the transmission in Neutral
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Pump the brakes
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23.
Which of the following is NOT true about escape ramps?
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Escape ramps are found on many mountain downgrades.
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Escape ramps are made to stop runaway vehicles safely.
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Any driver who loses brakes going downhill should avoid using an escape ramp, if possible.
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Escape ramps use a long bed of loose, soft material to slow runaway vehicles.
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24.
Which of these can cause your vehicle to skid?
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Over steering
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Over acceleration
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Braking any harder than necessary on slippery roads
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All of the above.
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25.
When driving in very hot weather, the heat will increase the chances of:
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suspension system defects.
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loss of hydraulic pressure.
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ABS malfunction.
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tire failure.
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26.
A bridge formula permits less maximum axle weight for axles that:
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are further apart than normal
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have poor weight balance
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have a high center of gravity
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are closer together
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27.
What should you do to test your hydraulic brakes for leaks?
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Pump the brake pedal five times, then apply pressure for three seconds.
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Hold the brake pedal down for five seconds, then pump it three times.
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Pump the brake pedal three times, then apply pressure for 9 seconds.
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Pump the brake pedal three times, then apply pressure to the pedal and hold for five seconds.
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28.
Drivers should watch out for black ice when the temperature is ______ freezing and the road looks ______.
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below; wet
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above; dry
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below; dry
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above; wet
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29.
The Johnson bar is a valve that:
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keeps air from going out if the air compressor develops a leak.
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is installed in the first tank the air compressor pumps air to.
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reduces the braking pressure to a safe level.
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works the trailer brakes.
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30.
Air tanks usually hold enough compressed air to allow the brakes to be used _________ even if the compressor stops working.
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for 3 days
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several times
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for one stop
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for one day
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