AIR BRAKES CDL PRACTICE TEST - KENTUCKY
21.
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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22.
If you're feeling tired while driving you should:
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drink coffee.
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stop driving and get some rest.
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increase your speed to get to your destination quicker.
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eat something.
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23.
When should you downshift automatic transmissions?
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Watch your tachometer, and downshift when your engine reaches the top of the range.
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When you start to get drowsy.
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When going down steep grades.
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When you want to go faster.
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24.
Which of the following is NOT a way to determine if your trailer is equipped with ABS (antilock braking system)?
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The letters "ABS" are printed on the side of the steering wheel.
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Wheel speed sensor wires are coming from the back of the brakes.
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It has yellow ABS malfunction lamps.
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It was built after March 1, 1998.
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25.
If you are driving a 30-foot vehicle at 55 mph, you should leave at least _____ between you and the vehicle ahead.
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4 seconds
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3 seconds
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2 seconds
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5 seconds
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