Combination Test - Texas CDL Exam
Questions With Verified Answers.
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.
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