CDL AIR BRAKES PRACTICE TEST - NEW JERSEY
21.
Before driving a truck or bus with a dual air brake system, the minimum pressure in both the primary and secondary
systems should be at least:
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100 psi.
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75 psi.
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130 psi.
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50 psi.
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22.
If stopped on a hill, how can you start moving without rolling back?
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Press on the gas pedal, even if you have to roll back a little.
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Release the parking brake before you have applied enough engine power to keep from rolling back.
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Partly engage the clutch before you take your right foot off the brake, put on the parking brake if necessary.
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None of the above.
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23.
The application pressure gauge shows:
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how much pressure the relay valves should send to the trailer brakes.
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how much pressure is in the air tanks.
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how much air pressure you are applying to the brakes.
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All of the above.
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24.
If you must drive through a deep puddle you should:
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start slowly and Speed up smoothly and gradually so the vehicle does not jerk.
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apply the brakes until your speed reaches 40 mph.
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slow down and place transmission in a low gear.
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speed up to get through the puddle as quickly as possible.
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25.
What is a dual air brake system?
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2 separate air brake systems: one system for daytime driving, the other system for nighttime driving.
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2 separate air brake systems: one system operates the left brakes, the other system operates the right brakes.
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2 separate air brake systems: one system operates the front brakes, the other system operates the rear brakes.
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None of the above.
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