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Relay
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Supply
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Emergency
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Oklahoma CDL Permit Test - Combination
(From the 2020 Oklahoma 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 service air line is often controlled by the foot brake and is attached to the ____ valves.
2.
When coupling, after you've connected the air lines to the trailer, you should:
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Supply air to the trailer.
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Activate the emergency brake.
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Disconnect the glad hands.
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3.
Before beginning a trip, you should:
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Leave the service line valve open.
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Remove the relay valves.
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Close the emergency line valve.
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4.
Before a trip, you can make sure air flows to all trailers by:
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Checking for moving air inside of each trailer.
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Listening for air at the rear shut-off valve.
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Feeling for air at the front shut-off valve.
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5.
If a trailer begins to jackknife, the driver:
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Should not apply the trailer hand brake.
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Should firmly apply the brakes.
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Can straighten the trailer with the parking brake.
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6.
If a load is placed on one side of a trailer, the trailer:
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May lean during turns.
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May add extra support during turns.
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May be easier to steer during turns.
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7.
Combination vehicles:
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Are usually shorter than single commercial vehicles.
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Usually require less skill to drive than single commercial vehicles.
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Usually require more skill to drive than single commercial vehicles.
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