DE CDL COMBINATION TEST - PRACTICE TEST
11.
A steering wheel should have no more than _____ of play. If there is more play than this, it may be hard to steer.
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15 degrees
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It doesn't matter.
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30 degrees
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10 degrees
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12.
When inspecting the coupling, check that the safety latch is:
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in position over the locking lever.
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pushing against the kingpin.
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in the "lock" position.
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None of the above.
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13.
You are coupling a tractor to a semi-trailer. After checking the trailer height but before supplying air to the trailer, you should:
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inspect the fifth-wheel.
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connect the air lines to the trailer.
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lock the trailer brakes.
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raise the front trailer supports.
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14.
Which of the following is NOT part of testing the trailer service brakes?
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Pushing in the trailer air supply knob.
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Releasing the parking brakes.
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Checking for normal air pressure.
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Moving the vehicle forward slowly.
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15.
When inspecting the cargo, make sure it is:
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not overloaded.
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piled up.
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secured properly for the first 50 miles after beginning a trip.
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All of the above.
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16.
If your vehicle catches fire, you should pull over:
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near other vehicles.
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near trees.
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in an open area.
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at a service station.
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17.
The only way to stop a front-wheel skid is to:
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supply more power to the drive wheels.
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countersteer.
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let the vehicle slow down.
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All of the above.
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18.
You are driving a combination vehicle and must use your brakes to avoid a crash. You should:
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use the parking brake.
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brake lightly and hold the steering wheel firmly.
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push the brake pedal as hard as you can and hold it there.
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use stab braking or controlled braking.
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19.
To unlock the fifth wheel, pull the release handle to the _______ position.
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closed
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neutral
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open
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sixth
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20.
When driving trucks with trailers, drivers should:
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push the brake pedal to the floor when braking.
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decrease their following distance.
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avoid making sudden movements with the steering wheel.
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make quick lane changes.
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