AIR BRAKES CDL PRACTICE TEST - SOUTH DAKOTA
21.
If stopped on a hill, how can you start moving without 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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Release the parking brake before you have applied enough engine power to keep from rolling back.
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Press on the gas pedal, even if you have to roll back a little.
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None of the above.
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22.
Excessive use of the service brakes results in overheating. Too much heat can:
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cause the brakes to squeak.
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cause the brakes to grab.
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make the brakes stop working.
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cause the brakes apply unevenly.
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23.
The s-cam forces the brake shoes away from one another and presses them against the inside of the brake drum. It is called the s-cam because:
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it applies a "Shock" to the brakes.
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"S" stands for "Shoes".
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it is shaped like the letter "S".
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it is a safe-driving brake.
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24.
Which of the following is not a type of retarder?
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Electric
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Pressure
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Exhaust
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Hydraulic
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25.
What is a dual air brake system?
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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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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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None of the above.
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