1.
If the safety relief valve in the air brake system releases air:
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something is wrong.
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this will supply more power to the brakes.
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the valve is fully operational.
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2.
When driving a 50 foot combination vehicle at 50 mph in ideal conditions, you should keep at least ____ seconds of space in front of you.
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10
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5
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6
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3.
When you turn suddenly while pulling doubles, which trailer is most likely to turn over?
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The rear trailer is twice as likely to turn over as the tractor.
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All trailers are equally likely to turn over.
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The front trailer is twice as likely to turn over as the tractor.
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4.
When backing, as soon as you see the trailer getting off the proper path, you should:
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turn the top of the steering wheel in the opposite direction of the drift.
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turn the top of the steering wheel in the direction of the drift.
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to keep a firm grip on the steering wheel and continue backing.
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5.
To test the service brake:
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gently try to pull forward with the trailer parking brake on, then release the brake.
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shift your transmission to a low gear, pump the brake pedal three times, then hold it down for five seconds.
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push the brake pedal firmly while going about 5 mph.
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6.
If you cannot make a right turn without entering another traffic lane, you should:
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turn wide as you complete the turn.
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turn wide before you start the turn.
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swing wide to the left before starting the turn.
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7.
Cargo tie-downs are used to:
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prevent freezing.
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prevent right-turn accidents.
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keep cargo from shifting or falling.
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8.
When driving on slippery roads, you should NOT:
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use the engine brake.
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try to anticipate stops early.
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go slowly.
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9.
If the drive wheels begin to spin when accelerating, you should:
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continue to accelerate.
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take your foot off the accelerator.
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brake gently.
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10.
You are coupling a semi-trailer to your tractor but have not yet backed under. The trailer is at the right height when:
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the locking jaws are around the head of the kingpin.
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it will be raised slightly when the tractor is backed under it.
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the end of the kingpin is even with the top of the fifth wheel.
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