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...
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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