NC CDL COMBINATION PRACTICE TEST
11.
One way to prevent hydroplaning is to:
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have less than 4/32 inch tread depth in every major groove on front tires.
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use the controlled braking method.
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make sure you have enough tread on your tires.
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take curves at higher speeds.
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12.
If you are feeling sleepy, you should:
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slow down and drive on the shoulder of the road.
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pull off the road and rest or take a nap.
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increase your speed to get to the destination quicker.
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None of the above.
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13.
You are coupling a tractor to a semi-trailer and have backed up but are not yet under the trailer. Before backing under the semi-trailer, you should hook up:
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the landing gear.
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the safety chain.
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the emergency and service air lines.
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the electrical service cable.
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14.
To avoid rollovers, you should drive slowly:
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on ramps.
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around corners.
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off ramps.
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All of the above.
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15.
Brake fade results from, and is affected by:
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excessive heat caused by using the brakes too much.
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excessive heat caused by not relying on the engine braking effect.
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brakes out of adjustment.
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All of the above.
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16.
The proper following distance for a 60-foot vehicle traveling at 50 mph is:
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7 seconds
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6 seconds
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8 seconds
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4 seconds
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17.
Which of the following is NOT part of inspecting the coupling?
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Checking that the locking lever is in the "lock" position
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Making sure the fifth-wheel jaws have closed around the shank of the kingpin.
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Checking for enough clearance between the rear of the tractor frame and the landing gear.
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Making sure there is no space between the upper and the lower fifth-wheel
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18.
On any upgrade, gravity:
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doubles your speed.
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slows you down.
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speed you up.
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doesn't affect your speed.
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19.
To be in the proper position for coupling, the fifth wheel should:
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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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be tilted down towards the rear of the tractor.
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be level with the ground.
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20.
The tractor protection valve:
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supplies air to the trailer air tanks.
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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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works the trailer brakes.
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