NE CDL COMBINATION PRACTICE TEST
11.
If the drive wheels start to skid:
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accelerate slightly to regain control.
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push in the clutch to let them turn freely.
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use the brakes to slow down.
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All of the above.
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12.
What is the proper following distance for a 50 foot truck traveling at 50 mph?
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10 seconds
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6 seconds
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25 seconds
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5 seconds
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13.
Off-tracking is:
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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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when the tires lose their contact with the road and have little or no traction.
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None of the above.
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14.
The emergency air line does NOT:
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supply air to the trailer air tanks.
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pump air into the relay valves, allowing the trailer brakes to be applied more quickly.
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cause the tractor protection valve to close when the emergency line loses pressure.
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control the emergency brakes on combination vehicles.
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15.
Most heavy-duty vehicles use:
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air brakes.
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hydraulic brakes.
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solid brakes.
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pressure brakes.
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16.
Foundation brakes are used:
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at each wheel.
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only with the front wheels.
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only with the right wheels.
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only with the rear wheels.
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17.
If the spring brakes do not release when you push the trailer air supply control, you should:
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pump the brakes.
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check the air line connections.
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check the electrical cables.
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rev or
lug the engine.
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18.
To prevent a rollover, the driver should:
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drive on the shoulder if possible.
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make quick lane changes if possible.
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drive slowly around corners, on ramps, and off ramps.
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pay extra attention to the coolant level.
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19.
How do you find out how many seconds of following distance you have?
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Wait until the vehicle ahead of you passes a pavement marking or some other clear landmark, then use the stopwatch on your mobile phone to see how long it takes you to reach the same spot.
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Pass a stationary object and count how many seconds it takes the vehicle ahead of you to reach the same spot.
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Wait until the vehicle ahead of you passes a pavement marking, shadow or landmark. Then count off the seconds until you reach the same spot.
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None of the above.
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20.
The first thing to do when coupling a tractor-semitrailer is to:
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check the trailer height.
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inspect the fifth wheel.
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position the tractor.
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lock the trailer brakes.
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