CDL COMBINATION PRACTICE TEST (DE)
11.
Most hydraulic brake failures occur for one of two reasons, one of which is:
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loss of hydraulic pressure.
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excessive downshifting.
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relying too much on the engine braking effect.
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driving in cold weather.
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12.
When you inspect the coupling, make sure there is ______ between the upper and lower fifth wheel.
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about 1 inch
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enough space
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no space
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about 1/2 inch
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13.
When driving on slippery roads, you should NOT:
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try to anticipate stops early.
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watch far enough ahead to keep a steady speed.
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go slowly.
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use the engine brake.
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14.
Blocking and bracing are:
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used to keep cargo from sliding and to prevent movement of cargo.
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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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None of the above.
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15.
After supplying air to the trailer brake system, you should check the brake system for crossed air lines by:
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checking the air brake system pressure gauge for signs of major air loss.
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shutting the engine off so you can hear the brakes.
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applying and releasing the trailer brakes and listening for the sound of trailer brakes.
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All of the above.
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16.
If your vehicle thumps or vibrates heavily, it may be a sign that:
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the engine belt is loose.
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the brakes have failed.
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one of the tires has gone flat.
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you need to shift up.
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17.
When checking the air and electric lines to the trailer, be sure that the air lines are properly connected to the gland hands, and are:
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properly greased.
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secured with enough slack for turns.
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secured with enough air leaks for turns.
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None of the above.
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18.
Fully loaded rigs:
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are much more likely to roll over than empty rigs.
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are less likely to roll over than empty rigs.
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are just as likely to roll over as empty rigs.
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None of the above.
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19.
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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20.
If you cannot make a right turn without entering another traffic lane, you should:
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turn wide as you complete the turn.
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swing wide to the left before starting the turn.
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watch out for vehicles coming toward you and back up for them.
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turn wide before you start the turn.
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