NJ CDL COMBINATION PRACTICE TEST
11.
Blocking and bracing are:
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coupling devices used to connect the service air lines from the truck or tractor to the trailer.
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driving techniques used to regain control when your drive wheels start to skid.
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used to keep cargo from sliding and to prevent movement of cargo.
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None of the above.
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12.
When driving a 50 foot combination vehicle at 50 mph in ideal conditions, you should keep at least ____ seconds of space in front of you.
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10
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4
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6
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5
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13.
If your vehicle thumps or vibrates heavily, it may be a sign that:
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one of the tires has gone flat.
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the engine belt is loose.
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you need to shift up.
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the brakes have failed.
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14.
While driving, you should use your mirrors to:
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check where the rear of your vehicle is while you make turns.
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know where other vehicles are around you.
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check the condition of the tires and cargo.
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All of the above.
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15.
Empty trucks have the best braking. True or False?
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False.
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It depends on the cargo.
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It depends on the truck.
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True.
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16.
The center of gravity of a trailer should be:
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at the front of the trailer.
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as high as possible.
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as low as possible.
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at the rear of the trailer.
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17.
The use of brakes on a steep downgrade is:
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much more effective than the engine braking effect.
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the main braking factor.
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a supplement to the braking effect of the engine.
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dangerous, and should be avoided at all costs.
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18.
A steering wheel should have no more than _____ of play. If there is more play than this, it may be hard to steer.
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15 degrees
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10 degrees
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30 degrees
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It doesn't matter.
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19.
When you make a quick lane change, the crack-the-whip effect can turn the trailer over. The crack-the-whip effect is caused by:
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the rear trailer of a triple.
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rearward amplification.
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worn tire tread.
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strong wind.
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20.
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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