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Ensures that oil adequately lubricates the engine.
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Protects the tractor from exceeding a set speed.
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Keeps air in the truck braking system if the trailer develops a leak.
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Kentucky CDL Permit Test - Combination
(From the 2021 Kentucky CDL driver handbook)
| Number of questions: | 20 |
| Passing score: | 16 |
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 20 multiple-choice questions, and applicants will need to correctly answer a minimum of 16 questions to pass. The Combination test is not a replacement for the Double/Triple endorsement test.
Passing grade —
4 or fewer errors
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1.
The tractor protection valve:
2.
If you are backing and the trailer begins to drift off-course, the driver should:
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Return the steering wheel to the 12 o’clock position.
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Turn the top of the steering wheel in the direction of the drift.
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Turn the top of the steering wheel in the direction opposite of the drift.
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3.
The trailer hand valve:
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Should always be used for parking.
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Should only be used for parking on a downgrade.
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Should never be used for parking.
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4.
Fully-loaded rigs:
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Are less likely to roll over than empty rigs.
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Are more likely to roll over than empty rigs.
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Are just as likely to roll over as empty rigs.
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5.
The trailer hand valve should be used:
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To test the trailer brakes.
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To check the connection between the trailer and tractor.
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To accelerate.
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6.
What is the tractor protection valve?
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A valve that keeps air in the brake system should a bad leak occur
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A valve that prevents the trailer from being accidentally released
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A valve that prevents the vehicle from going too fast
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7.
When driving while pulling trailers, you should:
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Make sudden turns with the steering wheel.
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Avoid making sudden moves.
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Push the accelerator to the floor when starting from a stop.
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