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The signal line
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The cable line
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The surplus line
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The power line
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New Jersey CDL Permit Test - Combination
(From the 2021 New Jersey 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.
What is another name for the service line?
2.
Using the trailer hand brake while experiencing a trailer jackknife will:
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Stop the skid.
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Straighten the trailer.
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Increase traction.
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Continue the skid.
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3.
If oil and water build up in your vehicle's air tanks, the brakes:
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May not work correctly.
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May feel squishy.
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Will squeal loudly when used.
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Will be extremely sensitive.
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4.
While inspecting a coupling, you should go under the trailer and:
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Detach the jaws from around the kingpin.
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Make sure the locking lever is in the "emergency" position.
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Remove the safety latch.
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Look into the back of the fifth wheel.
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5.
Emergency air lines are often coded with the color:
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Green.
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Orange.
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Yellow.
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Red.
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6.
When driving a tractor-trailer equipped with ABS, you should:
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Stop harder than you would otherwise.
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Use extra braking force to ensure the ABS kicks in.
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Brake as you normally would.
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Brake using less pressure than you would otherwise use.
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7.
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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