TN CDL DOUBLES TRIPLES PRACTICE TEST
11.
At night, when the load on a vehicle extends 4 feet or more beyond the rear of the body, there must be _______ at the end of the load.
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2 red lights
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2 fluorescent orange flags
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2 red flags
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None 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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All trailers are equally 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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None of the above.
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13.
If your vehicle has air brakes, to check that air flows to all trailers:
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go to the rear of the second trailer and open the emergency line shut-off.
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pull gently on the trailer with the tractor.
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check that the fifth wheel is not so far forward that the tractor frame will hit the landing gear.
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watch each trailer’s air gauge for a drop of 25 psi.
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14.
Which of the following will NOT help you prevent rollover?
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Keeping the cargo as close to the ground as possible.
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Driving slowly around turns.
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Using the controlled braking method.
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All of the above.
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15.
Which of the following is NOT true?
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ABS won't compensate for bad brakes.
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ABS only comes into play when a wheel would have locked up because of over braking.
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ABS won't compensate for poor brake maintenance.
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ABS will change the way you normally brake.
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16.
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 people from spilled cargo.
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To protect the cargo from weather.
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All of the above.
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17.
A red triangle with an orange center means:
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Slow-moving vehicle
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Law enforcement vehicle
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The vehicle is hauling hazardous materials
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Liquid tanker
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18.
The safety valve is usually set to open at:
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100 psi.
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75 psi.
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200 psi.
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150 psi.
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19.
If the fifth-wheel locking lever is not locked after the jaws close around the kingpin:
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the coupling is not right and you should not drive until you get it fixed.
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the parking brakes are on and the wheels are chocked.
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the parking brakes are on and your vehicle is safe to drive.
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cargo is properly blocked.
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20.
If you unlock the pintle hook with the dolly still under the rear trailer:
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the brakes could be damaged by the combined forces of the springs and the air pressure.
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your vehicle might roll away.
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the dolly tow bar may fly up.
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steam and boiling water can spray under pressure.
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