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Opening the rear shut-off valves and listening for escaping air.
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Closing the rear shut-off valves and listening for escaping air.
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Disconnecting air supply lines and listening for escaping air.
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Rolling each trailer down a hill and testing the brakes.
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Nevada CDL Permit Test - Combination
(From the 2021 Nevada 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 Nevada 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.
Before a drive, ensure that air flows to all trailers by:
2.
To help prevent rollovers, you should:
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Accelerate quickly after stopping.
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Drive slowly around turns.
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Keep the load near the back of the trailer.
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Keep the load on one side of the trailer.
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3.
When coupling a trailer:
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Make sure to couple matching glad hands.
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Any glad hand can be connected to any other glad hand.
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It is best to leave one glad hand unattached.
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Only one set of glad hands should be connected.
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4.
If a trailer begins to jackknife, you should not:
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Release the brakes.
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Apply the trailer hand brake.
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Allow the wheels to grip the road.
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Allow the trailer to straighten out.
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5.
When backing a trailer, you must first turn the steering wheel:
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In the direction you want the trailer to go.
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In the direction opposite of where you want the trailer to go.
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To the left.
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6.
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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7.
A loss of air pressure in the emergency line will cause:
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The suspension springs to extend.
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The tractor protection valve to open.
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The rear trailer to detach from the combination.
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The emergency brakes to activate.
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