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CDL Practice Combination Study Exam Guide Test.
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CDL Practice Combination Study Exam Guide Test. You have pushed the trailer air supply valve. You should not move or back a tractor under a trailer, until the whole air system is: A. At normal pressure. B. Between 60 and 80 psi. C. Empty. - CORRECT ANSWER A. At normal pressure When you u...

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  • August 18, 2024
  • 13
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • cdl
  • cdl practice combination study exam guide test

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CDL Practice Combination Study Exam
Guide Test.

You have pushed the trailer air supply valve. You should not move or back a tractor under a trailer, until
the whole air system is:

A. At normal pressure.

B. Between 60 and 80 psi.

C. Empty. - CORRECT ANSWER A. At normal pressure



When you uncouple a trailer, and after turning off the trailer air supply and put on the trailer brakes, you
should:

A. Start down the trailer landing gear.

B. Back slowly, to decrease the pressure from the locking wheel.

C. Immediately put on the tractor parking brakes. - CORRECT ANSWER C. Immediately put on the tractor
parking brakes.



You supply air to the trailer tanks by:

A. Connecting the service line glad hand.

B. Pushing in the trailer air supply valve.

C. Pulling out the trailer air supply valve - CORRECT ANSWER B. Pushing in the trailer air supply valve.



You are about to back your tractor under a semitrailer. The trailer is at the right height when the:

A. The kingpin is 1 1/4 over the fifth wheel.

B. Trailer will be lifted slightly when the tractor backs under it.

C. End of the kingpin is even with top of the fifth wheel. - CORRECT ANSWER B. Trailer will be lifted
slightly when the tractor backs under it.



Semitrailers made before 1975 that are equipped with air brakes:

A. Often don't have spring brakes.

, B. Usually need glad hand converter.

C. They have only one air service line. - CORRECT ANSWER A. Often don't have spring brakes.



The hand valve should be used:

A. Only with the foot brake.

B. To test the air brakes.

C. Like a parking brake. - CORRECT ANSWER B. To test the air brakes.



The best way to verify whether your truck "__":

A. Feel a pull in the cab.

B. Looking through your mirrors.

C. Hear the wheels skid. - CORRECT ANSWER B. Looking through your mirrors.



How much space should be between the upper and the lower fifth wheel after coupling?

A. Approximately 1/4 of inch.

B. Just enough to see light through it.

C. None. - CORRECT ANSWER C. None



Tractor air and electric lines should be:

A. Firmly pulled, with very little loose parts.

B. Over the tractor structure.

C. Secured in place, but make sure it will be loose enough when it makes turns. - CORRECT ANSWER C.
Secured in place, but make sure it will be loose enough when it makes turns.



You have coupled with a semitrailer. In what position you put the front trailer supports before driving
away?

A. Raised half (1/2) way with the crank handle secured in the bracket.

B. Raised 3/4 way with the crank handle removed.

C. Fully raised with the crank handle secured in its bracket. - CORRECT ANSWER C. Fully raised with the
crank handle secured in its bracket.

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