UTAH CDL DOUBLES TRIPLES PRACTICE TEST
11.
In vehicles with air brakes, the air compressor governor:
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controls when the air compressor will pump air into the air storage tanks.
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controls how much air the air compressor will pump into the air storage tanks.
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controls when the air storage tanks will pump air into the air compressor.
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None of the above.
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12.
The best advice for driving in fog is:
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drive slowly in the left lane of traffic.
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use low beams.
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use high beams.
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don't drive.
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13.
Which of these is more likely to rollover due to the "crack-the-whip" effect?
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The last trailer of triples
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The last trailer of doubles
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The front trailer of 65 ft. conventional doubles
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5-axle tractor semitrailers
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14.
Which of the following will NOT help you prevent rollover?
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Driving slowly around turns.
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Using the controlled braking method.
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Keeping the cargo as close to the ground as possible.
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All of the above.
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15.
The space under a heavily loaded vehicle can be very small. This can cause problems:
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when crossing railroad tracks.
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on unpaved yards.
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on dirt roads.
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All of the above.
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16.
"Bobtail" tractors are:
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heavily loaded trailers.
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tractors with two trailers.
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tractors with a tank.
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tractors without semitrailers.
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17.
For safety during a trip, you should:
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check critical items when you stop.
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watch gauges for signs of trouble.
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use your senses to check for problems.
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All of the above.
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18.
The tractor protection valve:
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prevents the trailer from being accidentally released.
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keeps air in the brake system should the trailer develop a bad leak.
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keeps air from going out if the air compressor develops a leak.
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keeps your wheels from locking up when you brake hard.
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19.
If your brakes fail on a steep mountain downgrade, you should:
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decide what to do as soon as you know your brakes do not work.
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stay on the road and keep looking for the next available escape ramp.
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slow down until your vehicle comes to a complete stop.
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set the parking brake and park in an open area.
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20.
Combination vehicles usually:
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require more driving skill than single CMVs.
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are shorter than single than single CMVs.
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are easier to drive than single than single CMVs.
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All of the above.
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