CDL PRACTICE TEST - GENERAL KNOWLEDGE (IOWA)
21.
After an accident, an improper use of flares could cause:
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a fire if spilled fuel is on the ground.
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air pressure to build from 50 to 100 psi within 2 minutes.
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the springs to put on the brakes.
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22.
When driving through a large puddle or flowing water, you should:
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slow down.
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increase engine rpm.
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All of the above.
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23.
Which of the following statements is FALSE?
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ABS (Antilock Braking Systems) only activate when wheels are about to lock.
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You can almost always turn to miss an obstacle more quickly than you can stop.
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If a tire blows, you should put the brakes on hard to stop quickly.
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24.
Emergency brakes must be held on by:
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mechanical force.
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hydraulic pressure.
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air pressure.
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25.
Which of the following statements about cold medicines is true?
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They are over-the-counter drugs, therefore they can be used while driving.
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They may make the driver drowsy, therefore they should not be used while driving.
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They should only be used when driving during the daytime.
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26.
In coming down steep downgrades, you should:
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go slowly enough so your brakes don't get too hot.
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select an appropriate speed.
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All of the above.
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27.
Before driving a vehicle with a dual air system, allow time for the air compressor to build up a minimum of ____ pressure in both the primary and secondary systems.
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75 psi
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100 psi
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50 psi
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28.
You should NOT use the parking brakes if:
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the brakes are cold.
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the brakes are very hot.
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the brakes are too dry.
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29.
Which of the following is true about high beams?
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They should be used only if low beams suddenly stop working.
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High beams should be used when it is safe and legal to do so.
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You should use them when you are not within 50 feet of an approaching vehicle.
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30.
Combination vehicles usually require _________ single commercial vehicles.
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less driving skill than
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the same level of skill as
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more driving skill than
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