CDL Exam-Combination Vehicles Test with Complete
Solutions
Before backing, check behind your vehicle by Correct Answer-Getting out of the cab
You are testing the air leaking rate of a combination vehicle. The system is at full pressure, the
engine is off, and the brakes are off. The leakage rate should be less than __ per minute.
Correct Answer-3 psi
The air leakage rate in a combination vehicle should not be more than __ per minute with the
engine off the brakes on. Correct Answer-4 psi
There are two things a driver an do to prevent a rollover. They are:
1. Keep the weight in your truck as close to the ground as possible. and 2. Correct Answer-
Go slow around turns
Which one of the following statements is true? Correct Answer-Bobtail tractors take longer
to stop than loaded combination vehicles.
, CDL Exam-Combination Vehicles Test with Complete
Solutions
In normal driving some drivers use the hand valve before the brake pedal to prevent a
jackknife. Which of the statements is true? Correct Answer-It should not be done.
When should you use the hand valve to park a combination vehicle. Correct Answer-never
Airlines on a truck are often color coded so you will not mix them up. If they are colored, the
emergency line will be ___ and the service line ___ Correct Answer-Emergency line - red
Service line - blue
A device which allows the trailer brakes to be applied more quickly than would other be
possible: Correct Answer-Relay value
You are driving a combination vehicle when the trailer breaks away pulling apart both air
lines. You would expect the trailer brakes to come on and what else would happen.
Correct Answer-The tractor protection valve would close
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