CT CDL DOUBLES TRIPLES PRACTICE TEST
11.
If your vehicle has air brakes, to check that air flows to all trailers:
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pull gently on the trailer with the tractor.
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watch each trailer’s air gauge for a drop of 25 psi.
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go to the rear of the second trailer and open the emergency line shut-off.
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check that the fifth wheel is not so far forward that the tractor frame will hit the landing gear.
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12.
If there is a fire and you are not sure what to use to put it out, you should:
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use a fire extinguisher.
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wait for firefighters.
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use dry powder.
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use water.
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13.
When connecting to the rear trailer, the trailer height should be:
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higher than the center of the fifth-wheel.
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lower than the center of the fifth-wheel.
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the same height as the fifth-wheel.
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None of the above.
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14.
Rough acceleration can cause:
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damage electrical and brake lines.
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mechanical damage.
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tire damage.
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All of the above.
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15.
To use the controlled braking method in an emergency, you should:
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apply your brakes all the way, and release the brakes when the wheels lock up.
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apply the brakes when the wheels lock up.
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apply the brakes as hard as you can without locking the wheels.
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pump the brake pedal 3 times.
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16.
The tractor protection valve:
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keeps your wheels from locking up when you brake hard.
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keeps air in the brake system should the trailer develop a bad leak.
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keeps air from going out if the air compressor develops a leak.
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prevents the trailer from being accidentally released.
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17.
How should you brake if your vehicle loses ABS?
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Stay off the Brake
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Pump the brake repeatedly
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Brake as you always have.
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Step on and off the brake pedal several times
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18.
Air tanks usually hold enough compressed air to allow the brakes to be used _________ even if the compressor stops working.
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for one day
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for 3 days
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for one stop
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several times
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19.
In vehicles with air brakes, the two markings on a front brake limiting valve are:
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wet and dry.
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high and low.
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normal and slippery.
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left and right.
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20.
On any upgrade, _________ – the more you will have to use lower gears to climb hills or mountains.
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the steeper the grade
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the longer the grade
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the heavier the load
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All of the above.
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