CDL COMBINATION PRACTICE TEST (NC)
11.
You should test the coupling by:
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disconnect the safety chains.
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pulling against the pin of the second semitrailer.
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locking the pintle hook.
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applying the parking brakes so the rig will not move.
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12.
When should you use the hand valve to park a combination vehicle?
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Never.
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Always.
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When parking downhill.
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To park at loading docks.
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13.
When using a fire extinguisher, you should stay:
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as far away from the fire as possible.
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at least 10 feet away from the fire.
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as close to the fire as possible, without getting burnt.
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at whatever distance you think is safe.
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14.
Which of the following makes a rollover more likely?
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Driving quickly around turns
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Keeping the load centered on your rig
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Driving slowly around turns
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Keeping the cargo as close to the ground as possible
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15.
You are driving a modern truck with a manual transmission. When going down a hill you should usually:
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use the same gear you would use to go up the hill.
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shift into neutral and coast.
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use a lower gear than would be required to go up the hill.
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downshift after your
speed has already built up.
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16.
In your mirror, you see a car approaching from the rear. The next time you check your mirror, you don't see the car. If you wish to change lanes, you should:
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ease into the other lane slowly so the other car can get out of the way.
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wait until you are sure the car isn't in your blind spot.
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assume the car left the roadway and change lanes as normal.
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None of the above.
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17.
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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connect the air lines to the trailer.
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inspect the fifth-wheel.
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lock the trailer brakes.
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raise the front trailer supports.
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18.
On front tires, tread should be at least:
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1/16 inch
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4/32 inch
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4/16 inch
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2/32 inch
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19.
When you get ready to back under the semi-trailer, you should:
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line up the kingpin to engage the driver's side locking jaw first.
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line up about 15 degrees off the line of the trailer.
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back under the trailer at an angle to avoid pushing the trailer sideways.
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line up directly in front of the trailer.
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20.
When inspecting the coupling, check that the safety latch is:
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pushing against the kingpin.
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in the "lock" position.
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in position over the locking lever.
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None of the above.
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