COMBINATION TEST - TEXAS CDL QUESTIONS AND ANSWERS
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COMBINATION - TEXAS CDL
Institution
COMBINATION - TEXAS CDL
COMBINATION TEST - TEXAS CDL
In coupling, just before the tractor is coupled with the trailer you should: - Answer- connect the emergency and service air lines.
In coupling, you should not move the tractor after it is coupled until you push in the air supply knob and: - Answer- wait until the...
COMBINATION TEST - TEXAS CDL
In coupling, just before the tractor is coupled with the trailer you should: - Answer-
connect the emergency and service air lines.
In coupling, you should not move the tractor after it is coupled until you push in the
air supply knob and: - Answer- wait until the air pressure is normal.
What happens immediately if the service air line comes apart while driving, but the
emergency line is okay? - Answer- Nothing is likely to happen until you press the
brakes.
In coupling, before you back under the trailer, how do you lock the trailer brakes? -
Answer- Pull out the yellow air supply knob.
For the coupling to be complete, the safety catch for the fifth wheel locking lever
must be: - Answer- over the locking gear.
What is the air leakage rate for a combination vehicle with the engine and brakes
off? - Answer- Less than 3 PSI per minute.
What is the maximum air leakage rate for a combination vehicle with the engine off
and the brakes on? - Answer- 4 PSI per minute.
A driver crosses the air lines when hooking up to an old trailer. What will happen? -
Answer- If the trailer has no spring brakes, he or she could drive away but wouldn't
have trailer brakes.
To unlock the fifth wheel, pull the release handle to the: - Answer- open position.
When driving a set of doubles, it is necessary to close the: - Answer- back shut-off
valve in the last trailer.
You are coupling a semitrailer to your tractor but have not yet backed under. The
trailer is at the right height when: - Answer- it will be raised slightly when the tractor
is backed under it.
Air and electric lines from the tractor to the trailer should be: - Answer- secured, but
with enough slack for turns.
When uncoupling a trailer, after you have shut off the trailer air supply and locked the
trailer brakes, you should: - Answer- back up gently to ease pressure on the fifth
wheel locking jaws.
Glad hands are used for connecting the: - Answer- service and emergency air lines
from the vehicle to the trailer.
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