COMBINATION PRACTICE TEST - MA CDL
11.
When parking a trailer without spring brakes, it is very important for safety that you use wheel chocks. Why?
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if you don't use wheel chocks, supply air will be sent to the service line instead of going to charge the trailer air tanks.
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The air could leak out of the trailer air tank, releasing its emergency brakes.
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You may not notice a major leak in the service line until you try to put the brakes on.
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None of the above.
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12.
To unlock the fifth wheel, pull the release handle to the _______ position.
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sixth
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closed
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neutral
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open
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13.
Hanging meat in a refrigerated truck can be:
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a very stable load with a low center of gravity.
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a very unstable load with a low center of gravity.
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a very stable load if properly distributed.
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a very unstable load with a high center of gravity.
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14.
After the pre-trip inspection, drivers should inspect their cargo and its securing devices again within ________ after beginning the trip.
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two hours
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25 miles
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50 miles
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20 miles
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15.
Poor weight balance:
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improves handling.
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increases fuel efficiency.
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can make vehicle handling more difficult.
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makes it easier to turn.
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16.
For a cargo fire in a box trailer, you should:
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wait 10 minutes before opening the doors.
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open the doors immediately and use the fire extinguisher.
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keep the doors shut.
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use the fire extinguisher on the doors.
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17.
Which of the following is NOT part of checking the sliding fifth-wheel?
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Checking that all locking pins are present and locked in place
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Checking that the slide is not damaged or parts are missing
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Testing the tractor protection valve
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Checking that it is properly greased
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18.
During a walk around inspection of a combination vehicle, drivers should check that:
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the locking jaws are around the shank.
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the glide plate is securely mounted to the trailer frame.
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all locking pins are present and locked in place.
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All of the above.
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19.
Before transporting sealed loads, you should check:
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the special transit permit.
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that you don't exceed gross weight and axle weight limits.
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a small sample of whatever is inside.
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None of the above.
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20.
Which of the following trailers can get stuck on raised crossings?
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Lowboy
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Car carrier
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Moving van
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All of the above.
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