Combination Test - Texas CDL
Combination Test - Texas CDL
Questions and Answers Solved 2024
In coupling, just before the tractor is coupled with the trailer you should: - 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: - 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? - 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? - Pull
out the yellow air supply knob.
For the coupling to be complete, the safety catch for the fifth wheel locking lever must
be: - over the locking gear.
What is the air leakage rate for a combination vehicle with the engine and brakes off? -
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? - 4 PSI per minute.
A driver crosses the air lines when hooking up to an old trailer. What will happen? - 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: - open position.
Combination Test - Texas CDL
, Combination Test - Texas CDL
When driving a set of doubles, it is necessary to close the: - 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: - it will be raised slightly when the tractor is backed under it.
Air and electric lines from the tractor to the trailer should be: - 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: - back up gently to ease pressure on the fifth wheel locking
jaws.
Glad hands are used for connecting the: - service and emergency air lines from the
vehicle to the trailer.
You should not back a tractor under a trailer until the whole air system is: - at normal
pressure.
If the spring brakes don't release when you push the trailer air supply control, you
should: - check the air line connections.
You are coupling a tractor to a semitrailer and have backed up but are not under it.
What should you hook up before backing under? - The emergency and service air lines.
In general, the higher the "center of gravity" of your truck the: - easier it is to turn over.
After you supply air to the trailer, make sure the air lines are not crossed and the trailer
brakes are working. This is done by: - applying and releasing the trailer brakes and
listening for brake sounds.
Combination Test - Texas CDL
Combination Test - Texas CDL
Questions and Answers Solved 2024
In coupling, just before the tractor is coupled with the trailer you should: - 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: - 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? - 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? - Pull
out the yellow air supply knob.
For the coupling to be complete, the safety catch for the fifth wheel locking lever must
be: - over the locking gear.
What is the air leakage rate for a combination vehicle with the engine and brakes off? -
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? - 4 PSI per minute.
A driver crosses the air lines when hooking up to an old trailer. What will happen? - 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: - open position.
Combination Test - Texas CDL
, Combination Test - Texas CDL
When driving a set of doubles, it is necessary to close the: - 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: - it will be raised slightly when the tractor is backed under it.
Air and electric lines from the tractor to the trailer should be: - 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: - back up gently to ease pressure on the fifth wheel locking
jaws.
Glad hands are used for connecting the: - service and emergency air lines from the
vehicle to the trailer.
You should not back a tractor under a trailer until the whole air system is: - at normal
pressure.
If the spring brakes don't release when you push the trailer air supply control, you
should: - check the air line connections.
You are coupling a tractor to a semitrailer and have backed up but are not under it.
What should you hook up before backing under? - The emergency and service air lines.
In general, the higher the "center of gravity" of your truck the: - easier it is to turn over.
After you supply air to the trailer, make sure the air lines are not crossed and the trailer
brakes are working. This is done by: - applying and releasing the trailer brakes and
listening for brake sounds.
Combination Test - Texas CDL
