Combination Vehicles Quiz Questions
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- 1.The fifth wheel should be checked to see if:
- A.
It is properly greased.
- B.
There are loose or missing pins in the slide mechanism of sliding 5th wheel.
- C.
Make sure locking pins are fully engaged.
- D.
All of the above.
- 2.The air leakage rate for a combination vehicle (engine off, brakes off) should be no more than _____ psi per minute.
- A.
2
- B.
3
- C.
4
- D.
5
- 3.Air lines on a commercial vehicle are usually color coded to keep them from getting mixed up. The emergency line is ______; the service line is ______.
- A.
Red ; blue
- B.
Blue ; red
- C.
Orange ; green
- D.
Green ; blue
- 4.Before backing under a trailer make sure that:
- A.
That the landing gear is in the upright position.
- B.
The trailer brakes are on.
- C.
Your air brakes are off.
- D.
The tractor protection valve is normal.
- 5.The air leakage rate for a combination vehicle (engine off; brakes on) should not be more than ____ psi per minute.
- A.
2
- B.
3
- C.
4
- D.
5
- 6.The easiest way to detect a trailer skid is by looking in your mirrors.
- A.
True
- B.
False
- 7.Semi trailers made before 1975 and equipped with air brakes:
- A.
Often do not have spring brakes.
- B.
Usually need a glad hand converter.
- C.
Are illegal in all 50 states.
- 8.Which best describes the term 'off-tracking'?
- A.
When the fifth wheel is not secured properly.
- B.
Taking an unfamiliar route.
- C.
The path of your steer wheels vs. the trailer wheels.
- 9.Hand valve should be used only in combination with the service pedal (foot brake).
- A.
True
- B.
False
- 10.What type of trailer is most likely to get stuck on railroad crossings?
- A.
Possum-belly livestock trailers.
- B.
Dry box van trailers.
- C.
Reefer (refrigerated) trailers.
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