CDL COMBINATION PRACTICE TEST SOUTH CAROLINA
11.
When uncoupling a trailer, after shutting off the trailer air supply to lock the trailer brakes, you should:
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pull the tractor forward until the fifth-wheel comes out from under the trailer.
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immediately apply your tractor parking brakes.
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back up gently to ease the pressure on the fifth-wheel locking jaws.
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inspect the trailer supports.
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12.
If an item placed on a flatbed trailer is 7 feet long, it should have __ tie-downs.
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2
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1
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7
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3
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13.
While driving, you should use your mirrors to:
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check the condition of the tires and cargo.
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know where other vehicles are around you.
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check where the rear of your vehicle is while you make turns.
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All of the above.
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14.
To be in the proper position for coupling, the fifth wheel should:
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be tilted down towards the rear of the tractor.
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be level with the ground.
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tilted up towards the rear of the tractor.
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have its jaws closed around the shank of the kingpin.
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15.
When you turn suddenly while pulling doubles, which trailer is most likely to turn over?
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The front trailer is twice as likely to turn over as the tractor.
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The rear trailer is twice as likely to turn over as the tractor.
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All trailers are equally likely to turn over.
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None of the above.
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16.
If your truck catches fire, the first thing you should do is to:
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pull into a service station and call for help.
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get the vehicle off the road and park near other vehicles.
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pull off the road and park in an open area.
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get off the vehicle, open the hood and start shooting foam to keep the engine cool.
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17.
The tractor protection valve:
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works the trailer brakes.
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controls the emergency brakes on combination vehicles.
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keeps air in the tractor brake system should the trailer break away or develop a bad leak.
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supplies air to the trailer air tanks.
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18.
Glad hands are used to:
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connect the electrical lines from the truck or tractor to the trailer.
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the air compressor is connected to the engine.
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connect the service and emergency air lines from the truck or tractor to the trailer.
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connect the brakes from the truck or tractor to the trailer.
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19.
At passive railroad crossings, even if there are active railroad signals that indicate the tracks are clear, you must _________ to be sure it is safe to proceed.
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stop, look, and listen
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listen, look and stop
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go, look and put the transmission in neutral
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go, stop and listen
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20.
A bridge formula permits less maximum axle weight for axles that:
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are further apart than normal
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are closer together
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have poor weight balance
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have a high center of gravity
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