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Utah CDL Permit Test - Combination

(From the 2020 Utah CDL driver handbook)
Number of questions: 30
Passing score: 25
Directions: All applicants who are applying for a Class A CDL should be prepared to take the Combination test. This test covers information found in Section 6 of the Commercial Driver License Manual. Section 6 provides the information needed to safely operate tractor-trailers, doubles, triples, and straight trucks with trailers. The test is made up of 30 multiple-choice questions, and applicants will need to correctly answer a minimum of 24 questions to pass. The Combination test is not a replacement for the Double/Triple endorsement test.
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Passing grade —
5 or fewer errors
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1.
A loss of air pressure in the emergency line will cause:
The service brakes to activate.
The tractor protection valve to close.
The rear trailer to detach from the combination.
The suspension springs to extend.
2.
The best way to notice if a trailer has begun to skid is to:
Ask another driver.
Use your mirrors to determine if the trailer has left the lane.
Look at the skid sensor.
Feel the tractor move.
3.
What is a bobtail tractor?
A tractor without a trailer
A tractor attached to two trailers
A tractor with a tank
4.
Place the trailer air supply control in its "emergency" position to test:
The trailer emergency brakes.
A coupling device.
The anti-lock brakes.
5.
In an empty combination vehicle, the stiff suspension springs and strong brakes will have:
High traction.
Low traction.
No traction.
6.
A tractor protection valve is:
A device that keeps air in the tractor or truck brake system, should the trailer break away or develop a bad leak.
A device that prevents theft.
A device that controls fuel levels.
A device that allows the battery to recharge efficiently.
7.
Proper coupling technique:
Is the same on all vehicles.
Is essential to the safe operation of a vehicle.
Includes ensuring that the fifth wheel plate is not greased.
Can be learned over time.
8.
Rollovers happen when:
A truck driver is driving too fast.
The driver of a vehicle in front of a truck is moving to slowly.
A truck driver is driving too slowly.
ABS is working effectively.
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