COMBINATION PRACTICE TEST - NE CDL
11.
When the trailer breaks away or develops a bad leak, the tractor protection valve will close automatically and:
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the trailer emergency brakes will come on.
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the tractor will lose all air pressure.
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the trailer supply valve will stay open.
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the engine will shut down.
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12.
When transporting cargo, the cargo should be checked:
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before the trip and after the first 150 miles.
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only after the trip.
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only before the trip.
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before the trip and after the first 50 miles.
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13.
When uncoupling, after you unlock the fifth-wheel you should:
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pull the tractor partially clear of the trailer.
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chock the trailer wheels.
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ease the pressure on the locking jaws.
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pull the tractor clear of the trailer.
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14.
Before connecting the converter dolly to the rear trailer, make sure that:
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the locking jaws rest on the kingpin.
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the shut-off valves at the rear of the first trailer are open.
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the trailer height is slightly lower than the center of the fifth-wheel.
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the kingpin rests on the fifth-wheel.
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15.
Which of the following is NOT part of testing the tractor protection valve?
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Stepping on and off the brake pedal several times to reduce the air pressure in the tanks.
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Shutting off the engine.
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Charging the trailer air brake system.
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Pulling forward slowly, then applying the trailer brakes.
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16.
When connecting the glad hands, you should press the two seals together with the couplers at a ______ angle to each other.
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45 degree
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180 degree
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30 degree
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90 degree
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17.
When the ______ closes, it stops any air from going out of the tractor.
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alcohol evaporator
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tractor protection valve
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height control valve
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hand valve
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18.
Emergency lines on combination vehicles are often coded with the color ____ to keep from getting them mixed up with the ____ service line.
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yellow; black
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red; yellow
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red; blue
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blue; red
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19.
Brake fade results from, and is affected by:
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brakes out of adjustment.
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excessive heat caused by not relying on the engine braking effect.
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excessive heat caused by using the brakes too much.
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All of the above.
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20.
To unlock the fifth wheel, pull the release handle to the _______ position.
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neutral
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closed
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sixth
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open
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