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MARYLAND CDL DOUBLES TRIPLES PRACTICE TEST

11. Before driving a vehicle with a dual brake brake system, the driver should:
allow time for the air compressor to build up a minimum of 100 psi pressure in both the primary and secondary systems.
wait at least 10 minutes before driving.
wait at least 5 minutes before driving.
pump the brake pedal 10 times to build pressure.
12. You should be especially alert for drunk drivers:
in the early evening.
late at night.
in the morning.
around shopping areas.
13. The best way to recognize that your trailer has started to skid is:
by feeling the brakes come on.
by recognizing tire failure.
by seeing it in your mirrors.
by opening the window and feeling the front of the mirror.
14. Which of the following is a common cause of truck fires?
Short circuits due to loose connections.
Under-inflated tires and duals that touch.
loose fuel connections.
All of the above.
15. When trying to put out an electrical fire you should:
use an A extinguisher.
use a B or C extinguisher.
use water.
use an D extinguisher.
16. If the air compressor is belt-driven, you should check the air compressor drive belt before each trip. The belt should be:
cracked.
loose.
worn.
tight.
17. Doubles/triples are:
easier to drive than other CMVs.
less stable than other CMVs.
more stable than other CMVs.
usually faster than most CMVs.
18. When driving with cargo, you should re-check the cargo and securing devices as often as necessary to keep the load secure, and inspect again:
every 6 hours or 300 miles.
every day.
every 3 hours or 150 miles.
every 30 minutes or 50 miles.
19. Pre-trip inspections of doubles and triples should:
take more time than inspecting straight trucks.
be done by the shipper.
take less time than inspecting straight trucks.
be done once a week.
20. You should NOT use the parking brakes if:
the brakes are very hot.
the brakes are too dry.
the brakes are cold.
All of the above.
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