CDL COMBINATION PRACTICE TEST (NE)
11.
Rollovers happen when drivers:
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turn too fast.
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stop too often.
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brake too hard.
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turn too slowly.
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12.
When you get ready to back under the semi-trailer, you should:
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line up the kingpin to engage the driver's side locking jaw first.
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line up about 15 degrees off the line of the trailer.
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line up directly in front of the trailer.
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back under the trailer at an angle to avoid pushing the trailer sideways.
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13.
Enough tread is especially important in winter conditions. You need at least ________ tread depth on steering axle tires.
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2/8 inch
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4/32 inch
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8/32 inch
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6/24 inch
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14.
You are coupling a tractor to a semi-trailer. After checking the trailer height but before supplying air to the trailer, you should:
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raise the front trailer supports.
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inspect the fifth-wheel.
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connect the air lines to the trailer.
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lock the trailer brakes.
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15.
Combination vehicles have __ air lines.
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1
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2
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4
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3
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16.
Broken suspension parts can be very dangerous. When inspecting your vehicle for suspension system defects, look for:
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Broken leaves in a multi-leaf spring.
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Spring hangers that allow movement of axle from proper position.
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Damaged air suspension systems.
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All of the above.
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17.
Strong winds can make it difficult to stay in your lane, especially when:
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driving at speeds below 40 mph.
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coming out of tunnels.
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going into tunnels.
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driving alongside other vehicles.
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18.
The emergency air line:
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controls the emergency brakes on combination vehicles.
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supplies air to the trailer air tanks.
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causes the tractor protection valve to close when the emergency line loses pressure.
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All of the above.
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19.
If you are being tailgated, you should:
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turn on your taillights.
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speed up.
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drive on the shoulder.
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try to let the other vehicle pass.
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20.
What are the two basic reasons for covering cargo?
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To protect the cargo from weather and to avoid littering.
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To protect people from spilled cargo and the cargo from pilferage.
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To protect people from spilled cargo and the cargo from weather.
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To protect the cargo from pilferage and from weather.
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