NY CDL COMBINATION PRACTICE TEST
11.
Off-tracking is:
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when the tires lose their contact with the road and have little or no traction.
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when a vehicle makes a turn and the rear wheels of the trailer end up driving in a different path than the tractor and the front wheels of the trailer.
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when a vehicle towing a trailer skids, and the trailer pushes the towing vehicle from behind until it spins the vehicle around.
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None of the above.
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12.
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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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.
If a trailer does not have spring brakes, to keep the trailer from moving you should:
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use the service brakes.
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use wheel chocks.
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park on a slight decline.
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close the brake valve.
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15.
At speeds below 40 mph, you should leave at least one second in front of you for each ___ feet of vehicle length.
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30
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5
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20
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10
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16.
On any upgrade, gravity:
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doubles your speed.
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speed you up.
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doesn't affect your speed.
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slows you down.
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17.
If a vehicle is equipped with ABS, when you start the engine:
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the spring brakes will come on.
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the wheels will lock up.
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the trailer emergency brakes will come on.
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the ABS indicator light on the dash should come on and then turn off.
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18.
One way to prevent hydroplaning is to:
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make sure you have enough tread on your tires.
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use the controlled braking method.
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take curves at higher speeds.
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have less than 4/32 inch tread depth in every major groove on front tires.
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19.
The crack-the-whip effect:
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can cause problems for drivers coming toward you.
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can cause a vehicle to tilt.
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can turn the trailer over.
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the ends of some vehicles to drag.
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20.
If you unlock the pintle hook with the dolly still under the rear trailer:
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the brakes could be damaged by the combined forces of the springs and the air pressure.
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your vehicle might roll away.
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steam and boiling water can spray under pressure.
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the dolly tow bar may fly up.
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