AIR BRAKES CDL PRACTICE TEST - TEXAS
21.
To perform an applied leakage test, the vehicle’s air pressure should be built up to maximum pressure. Check the air gauge to see that the air pressure should drop no more than:
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3 psi for single vehicles and 4 psi for a combination of 2 vehicles.
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2 psi for single vehicles and 5 psi for a combination of 2 vehicles.
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5 psi for single vehicles and 6 psi for a combination of 2 vehicles.
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1 psi for single vehicles and 3 psi for a combination of 2 vehicles.
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22.
Rough acceleration:
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is recommended during long trips.
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is necessary to warm up the engine.
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improves gas mileage.
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can cause mechanical damage.
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23.
A broken exhaust system:
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poses no threat to the driver.
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does not cause problems.
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can let poisonous carbon monoxide to leak into the cab.
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can improve fuel efficiency.
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24.
In vehicles with air brakes, the brake pedal:
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pumps air into the air storage
tanks.
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let the
air out of the spring brakes.
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tells you how much pressure is in
the air tanks.
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controls the air pressure applied to the brakes.
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25.
Which of the following is NOT a warning sign of fatigue?
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Driving at the speed of the traffic
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Trouble remembering the last few miles driven
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Frequent blinking
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Heavy eyelids
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