Texas CDL Combination Test with
Complete Solutions
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.
After you have coupled, what do you with the front trailer supports? - ANSWER-You raise
them fully and secure the crank handle.
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: - ANSWER-applying and releasing the trailer brakes
and listening for brake sounds.
Air and electric lines from the tractor to the trailer should be: - ANSWER-secured, but with
enough slack for turns.
For the coupling to be complete, the safety catch for the fifth wheel locking lever must be: -
ANSWER-over the locking gear.
Glad hands are used for connecting the: - ANSWER-service and emergency air lines from
the vehicle to the trailer.
How do you check the security of the kingpin and fifth wheel connection? - ANSWER-Pull
ahead gently with the trailer brakes locked.
If the spring brakes don't release when you push the trailer air supply control, you should: -
ANSWER-check the air line connections.
In coupling, before you back under the trailer, how do you lock the trailer brakes? -
ANSWER-Pull out the yellow air supply knob.
In coupling, how can you make sure the air lines are not crossed? - ANSWER-Pump the
brake and you will hear the brakes move and air escape.
In coupling, just before the tractor is coupled with the trailer you should: - ANSWER-
connect the emergency and service air lines.
In coupling, when is the trailer at the right height? - ANSWER-When the trailer will be lifted
slightly when tractor connects.
In coupling, where should the tractor be lined up? - ANSWER-Directly in front of the trailer.
Complete Solutions
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.
After you have coupled, what do you with the front trailer supports? - ANSWER-You raise
them fully and secure the crank handle.
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: - ANSWER-applying and releasing the trailer brakes
and listening for brake sounds.
Air and electric lines from the tractor to the trailer should be: - ANSWER-secured, but with
enough slack for turns.
For the coupling to be complete, the safety catch for the fifth wheel locking lever must be: -
ANSWER-over the locking gear.
Glad hands are used for connecting the: - ANSWER-service and emergency air lines from
the vehicle to the trailer.
How do you check the security of the kingpin and fifth wheel connection? - ANSWER-Pull
ahead gently with the trailer brakes locked.
If the spring brakes don't release when you push the trailer air supply control, you should: -
ANSWER-check the air line connections.
In coupling, before you back under the trailer, how do you lock the trailer brakes? -
ANSWER-Pull out the yellow air supply knob.
In coupling, how can you make sure the air lines are not crossed? - ANSWER-Pump the
brake and you will hear the brakes move and air escape.
In coupling, just before the tractor is coupled with the trailer you should: - ANSWER-
connect the emergency and service air lines.
In coupling, when is the trailer at the right height? - ANSWER-When the trailer will be lifted
slightly when tractor connects.
In coupling, where should the tractor be lined up? - ANSWER-Directly in front of the trailer.
