NH CDL COMBINATION PRACTICE TEST
11.
What is the emergency air line for?
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It supplies air to the trailer air tanks, and controls the emergency brakes on combination vehicles.
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It tells you the amount of brake pressure you need to stop the vehicle.
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It controls the front brakes of the tractor in case of an emergency.
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All of the above.
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12.
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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13.
To test the tractor-semitrailer connection for security:
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check that the trailer is locked onto the tractor by pulling the tractor gently forward while the trailer brakes are still locked.
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plug the electrical cord into the trailer and fasten the safety catch.
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pull out the air supply knob.
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go under the trailer and look into the back of the fifth-wheel.
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14.
If you feel drowsy while driving, what should you do?
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Get an energy drink.
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Eat heavy foods.
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Turn on the radio to keep you awake.
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Pull off the road and get some sleep.
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15.
You are coupling a tractor to a semi-trailer and have backed up but are not yet under the trailer. Before backing under the semi-trailer, you should hook up:
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the electrical service cable.
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the emergency and service air lines.
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the landing gear.
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the safety chain.
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16.
Most truck driver deaths in crashes result from:
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following too closely.
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driving side-by-side with another truck.
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truck rollovers.
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off-tracking.
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17.
You must check that all shut-off valves are in the open position except the ones:
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on the middle trailer of a set of triples.
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at the back of the last trailer.
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on the first trailer in a set of doubles.
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on the first trailer in a set of triples.
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18.
What is the proper following distance for a 40 foot truck traveling at 35 mph?
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5 seconds
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4 seconds
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12 seconds
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10 seconds
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19.
If you get stuck on railroad tracks, you should:
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get out of the vehicle and away from the tracks.
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stay in the vehicle and call for help.
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have a helper push your vehicle.
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check the engine compartment quickly.
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20.
Before transporting sealed loads, you should check:
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the special transit permit.
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that you don't exceed gross weight and axle weight limits.
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a small sample of whatever is inside.
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None of the above.
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