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TX CDL DOUBLES TRIPLES PRACTICE TEST

11. Which of the following vehicles is most likely to turn over?
3 axle tractor semitrailer
Triple trailer
5 axle tractor semitrailer
65 ft. conventional double
12. "Bobtail" tractors are:
tractors with a tank.
heavily loaded trailers.
tractors without semitrailers.
tractors with two trailers.
13. When you turn suddenly, which trailer is most likely to turn over?
The front trailer
The last trailer of triples
The rear trailer of doubles
None of the above.
14. If the drive wheels start to skid:
use the brakes to slow down.
accelerate slightly to regain control.
push in the clutch to let them turn freely.
All of the above.
15. With an engine fire, you should NOT:
turn the engine off as soon as possible.
open the hood.
shoot foam from the vehicle’s underside.
None of the above.
16. You should do an after-trip inspection:
at least once a week.
after each trip.
after each stop.
once a month.
17. Placards must be at least _____ inches square.
21.2
12.6
5
9.84
18. When should you turn the retarder off?
when your vehicle has a high center of gravity.
when the cargo is heavy.
when the cargo is prone to shifting.
when the road is slippery.
19. Which of the following statements is true?
Under-inflated tires will NOT cause a vehicle fire.
Carrying a properly charged and rated fire extinguisher will help prevent fires.
Poor cargo ventilation is a common cause of fire.
There is no way that short circuits due to damaged insulation can cause a vehicle fire.
20. The tractor protection valve:
keeps air in the brake system should the trailer develop a bad leak.
keeps air from going out if the air compressor develops a leak.
prevents the trailer from being accidentally released.
keeps your wheels from locking up when you brake hard.
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