CDL COMBINATION PRACTICE TEST (MD)
11.
After starting the engine, oil pressure should rise to a normal level:
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within seconds.
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within 6 minutes.
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within 3 miles.
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within 2 minutes.
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12.
On
a tractor-trailer equipped with a trailer brake hand
valve, the hand valve can be used to:
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reduce the chance of the front wheels skidding.
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prevent movement of cargo.
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keep from rolling back.
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hold compressed air.
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13.
Loose cargo:
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could hurt or kill you during a quick stop.
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can be a danger to others and yourself.
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could fall off your vehicle and cause traffic problems.
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All of the above.
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14.
When uncoupling a trailer, after shutting off the trailer air supply to lock the trailer brakes, you should:
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inspect the trailer supports.
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immediately apply your tractor parking brakes.
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pull the tractor forward until the fifth-wheel comes out from under the trailer.
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back up gently to ease the pressure on the fifth-wheel locking jaws.
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15.
When inspecting the cargo, make sure it is:
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piled up.
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not overloaded.
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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.
You have uncoupled a trailer and want to inspect the landing gear. The tractor should be positioned:
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with the tractor frame above the trailer.
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with the tractor frame under the trailer.
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completely clear of the trailer.
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None of the above.
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17.
You should not use the trailer hand brake to straighten out a jackknifing trailer. Why?
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The brakes on the trailer wheels will not respond.
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You should use the emergency break instead.
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You should use the service break instead.
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The brakes on the trailer wheels caused the skid in the first place.
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18.
If you discover a fire, before opening trailer doors you should:
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feel the doors to see if they are hot.
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use the fire extinguisher on the doors.
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have a helper open the doors.
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All of the above.
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19.
When backing a trailer, turn the wheel right to make the cab go ________ and the trailer go ________.
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right; right
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right; left
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left; left
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left; right
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20.
When backing a tractor under a trailer:
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you should lift the
trailer off the fifth-wheel.
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the end of the kingpin will be even with the top of the fifth wheel.
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the fifth-wheel will come out from under the trailer.
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the trailer will be lifted slightly when the tractor backs under it.
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