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The service brakes to activate.
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The tractor protection valve to close.
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The rear trailer to detach from the combination.
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The suspension springs to extend.
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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.
Passing grade —
5 or fewer errors
advertising
1.
A loss of air pressure in the emergency line will cause:
2.
The best way to notice if a trailer has begun to skid is to:
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Ask another driver.
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Use your mirrors to determine if the trailer has left the lane.
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Look at the skid sensor.
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Feel the tractor move.
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3.
What is a bobtail tractor?
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A tractor without a trailer
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A tractor attached to two trailers
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A tractor with a tank
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4.
Place the trailer air supply control in its "emergency" position to test:
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The trailer emergency brakes.
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A coupling device.
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The anti-lock brakes.
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5.
In an empty combination vehicle, the stiff suspension springs and strong brakes will have:
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High traction.
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Low traction.
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No traction.
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6.
A tractor protection valve is:
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A device that keeps air in the tractor or truck brake system, should the trailer break away or develop a bad leak.
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A device that prevents theft.
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A device that controls fuel levels.
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A device that allows the battery to recharge efficiently.
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7.
Proper coupling technique:
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Is the same on all vehicles.
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Is essential to the safe operation of a vehicle.
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Includes ensuring that the fifth wheel plate is not greased.
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Can be learned over time.
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8.
Rollovers happen when:
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A truck driver is driving too fast.
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The driver of a vehicle in front of a truck is moving to slowly.
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A truck driver is driving too slowly.
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ABS is working effectively.
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