CDL Combination Practice Test Questions With Verified Answers
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Course
CDL
Institution
CDL
CDL Combination Practice Test Questions
With Verified Answers
You're hooking up a tractor to a semi-trailer and have backed up but are not under it. What
should you do before backing under the trailer? - answerHook up the emergency and service
air lines.
After pushing in the trailer supply val...
CDL Combination Practice Test Questions
With Verified Answers
You're hooking up a tractor to a semi-trailer and have backed up but are not under it. What
should you do before backing under the trailer? - answer✔Hook up the emergency and service
air lines.
After pushing in the trailer supply valve, you should not move the tractor
until air system is? - answer✔At normal pressure
There are two things you can do to prevent a rollover. They are: Keep the cargo as close to the
ground as possible, and: - answer✔Reduce speed before entering turns.
With the engine off and the brakes released, a combination vehicle air brake system shouldn't
leak more than how many psi in one minute? - answer✔3 psi
The fifth wheel locking lever isn't locked after the jaws close around the kingpin. This means
that: - answer✔The coupling is not correct and should be corrected before driving the coupled
unit.
You cross the air lines when hooking up to an old trailer. What will happen? - answer✔If the
trailer has no spring brakes, you could drive away, but you wouldn't have trailer brakes.
How far should you crank up the front trailer supports after coupling a semi-trailer? -
answer✔Fully raised with the crank handle secured
Air brake equipped trailers made before 1975 - answer✔Usually do not have spring brakes
The hand valve should be used to park a combination vehicle: - answer✔Never
Air lines on a combination vehicle are often colored to keep them from getting mixed up. The
emergency line is ____ - answer✔Red
How do you supply air to the air tank on the trailer? - answer✔By pushing in the trailer air
supply valve.
In normal driving, some drivers use the hand valve before applying the brake pedal to prevent
trailer skids. Which of these statements is true? - answer✔It should never be done.
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