CDL Combination Test BANK EXAM COMPLETE
QUESTIONS WITH DETAILED VERIFIED ANSWERS
(100% CORRECT ANSWERS) ALREADY GRADED
A+\San Juan College
Which of these statements is true?
"Bobtail" tractors can take longer to stop than a combination vehicle
loaded to the maximum gross weight
In normal driving, some drivers use the hand valve before applying the
brake pedal to prevent a jackknife. Which of these statements is true?
It should not be done
When you inspect the coupling, check to ensure that:
There's a little slack in the air lines
When backing under a tractor under a trailer you should expect:
Trailer will be lifted slightly when the tractor back under it
A king pin is:
A pin which locks the trailer to the tractor on the fifth wheel
, The safety catch for the fifth wheel locking level must be for a
coupling to
be complete.
Over the locking lever
The air leakage rate for a combination vehicle (engine off, brakes off)
should be no more than psi per minute.
3
You are coupling a tractor to a semi-trailer and have backed up but are
not under it. What should you hook up before backing under?
The emergency and service air lines
Air lines on a combination vehicle are often colored to keep them from
getting mixed up. The emergency line is ____; the service line is _.
Red, blue
You should not back a tractor under a trailer until the whole air system is:
At normal pressure
Large combination vehicles take longer to stop:
When they are empty
QUESTIONS WITH DETAILED VERIFIED ANSWERS
(100% CORRECT ANSWERS) ALREADY GRADED
A+\San Juan College
Which of these statements is true?
"Bobtail" tractors can take longer to stop than a combination vehicle
loaded to the maximum gross weight
In normal driving, some drivers use the hand valve before applying the
brake pedal to prevent a jackknife. Which of these statements is true?
It should not be done
When you inspect the coupling, check to ensure that:
There's a little slack in the air lines
When backing under a tractor under a trailer you should expect:
Trailer will be lifted slightly when the tractor back under it
A king pin is:
A pin which locks the trailer to the tractor on the fifth wheel
, The safety catch for the fifth wheel locking level must be for a
coupling to
be complete.
Over the locking lever
The air leakage rate for a combination vehicle (engine off, brakes off)
should be no more than psi per minute.
3
You are coupling a tractor to a semi-trailer and have backed up but are
not under it. What should you hook up before backing under?
The emergency and service air lines
Air lines on a combination vehicle are often colored to keep them from
getting mixed up. The emergency line is ____; the service line is _.
Red, blue
You should not back a tractor under a trailer until the whole air system is:
At normal pressure
Large combination vehicles take longer to stop:
When they are empty
