DOUBLES TRIPLES TEST MD - CDL PRACTICE TEST
11.
The application pressure gauge:
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stops the compressor from pumping air.
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tells you how much pressure is in the air tanks.
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shows how much air pressure is being applied to the brakes.
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protects the tank and the rest of the system from too much pressure.
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12.
The tractor protection valve:
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prevents the trailer from being accidentally released.
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keeps your wheels from locking up when you brake hard.
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keeps air from going out if the air compressor develops a leak.
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keeps air in the brake system should the trailer develop a bad leak.
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13.
Longer combination vehicles have the tendency to swing wide on turns. This is called:
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hydroplaning.
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off-tracking.
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jackknifing.
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rollover.
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14.
Which of these is more likely to rollover due to the "crack-the-whip" effect?
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The last trailer of doubles
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5-axle tractor semitrailers
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The front trailer of 65 ft. conventional doubles
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The last trailer of triples
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15.
When driving in extremely hot weather, if the air pressure in the tires is too high, you should:
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let air out of the tires to decrease pressure.
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stop and remain stopped until the tires cool off.
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continue driving.
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call your supervisor.
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16.
On front tires, tread should be at least:
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2/32 inch
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4/16 inch
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4/32 inch
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1/16 inch
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17.
When you discover a fire, if the trailer doors are hot you should not open them because:
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with air many fires do less damage.
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the temperature of the trailer should not be changed in any way.
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opening the doors lets air in and may make the fire flare up.
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you should use the fire extinguisher on the door.
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18.
Air brakes use ________ to make the brakes work.
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compressed gases
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compressed air
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compressed oil
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compressed gas cylinders
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19.
Strong winds can make it difficult to stay in your lane especially when driving:
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vehicles with ABS.
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heavier vehicles.
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flatbed trailers.
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lighter vehicles.
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20.
If you must stop on a one-way or divided highway, you should place warning devices _______ toward the approaching traffic.
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3, 15 and 45 feet
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10, 100 and 200 feet
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5, 25 and 50 feet
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5, 50 and 500 feet
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