CDL COMBINATION PRACTICE TEST INDIANA
11.
If your vehicle is equipped with air brakes, loss of air pressure in the
emergency line causes:
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the speed of your vehicle to increase.
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the trailer spring brakes to come on.
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the trailer emergency brakes to come on.
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All of the above.
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12.
"Bobtail" tractors are:
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tractors with a tank.
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heavily loaded trailers.
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tractors without semitrailers.
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tractors with two trailers.
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13.
Rollovers happen when drivers:
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turn too fast.
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brake too hard.
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stop too often.
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turn too slowly.
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14.
When backing a trailer, if you turn the wheel left:
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the cab will go left and the trailer will go right.
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the cab and the trailer will go left.
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the cab will go right and the trailer will go left.
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the cab and the trailer will go right.
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15.
If your vehicle has dummy couplers, why should you use them when the air lines are not connected to a trailer?
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To prevent overheating.
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To prevent freezing of the washer liquid.
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Because if you don't, you will never build system pressure.
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To prevent water and dirt from getting into the coupler and the air lines.
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16.
Whenever you back up with a trailer, position your vehicle so you can back in a straight line. If you must back on a curved path, back toward:
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the right side.
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Either side.
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the driver's side.
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Neither side (do not back).
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17.
What happens when the center of gravity of a truck moves higher up from the road?
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It becomes much easier to downshift at the right rpm.
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It is easier it is to turn around corners.
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The truck becomes easier to turn over.
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The vehicle is more stable while turning.
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18.
Why should you cover your cargo?
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Because spill protection is a safety requirement in many states.
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To protect the cargo from weather.
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To protect people from spilled cargo.
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All of the above.
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19.
Which of the following statements about off-tracking is true?
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If there is more than one trailer, the rear wheels of the last trailer will off-track the most.
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When a vehicle goes around a corner, the rear wheels follow the same path as the front wheels.
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Longer vehicles off-track less.
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None of the above.
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20.
You are driving a modern truck with a manual transmission. When going down a hill you should usually:
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downshift after your
speed has already built up.
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use the same gear you would use to go up the hill.
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use a lower gear than would be required to go up the hill.
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shift into neutral and coast.
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