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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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Illinois CDL Permit Test - Combination
(From the 2021 Illinois 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 Illinois Commercial Driver's License Study Guide. 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
advertising
1.
Before a drive, ensure that air flows to all trailers by:
2.
What does the trailer air supply control look like?
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It is a square blue knob.
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It is a triangular yellow knob.
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It is an eight-sided red knob.
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It is a circular orange knob.
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3.
What is a bobtail?
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A tractor without a semi-trailer
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A tractor with two semi-trailers
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A tractor that goes faster than the speed limit
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A tractor that goes slower than the speed limit
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4.
When driving a bobtail tractor, you should be aware that:
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Bobtails stop very easily.
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Bobtails cannot drive as fast as tractors with semitrailers.
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Bobtails are more difficult to stop than tractors with semitrailers.
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Bobtails are illegal in most states.
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5.
To lower the risk of a rollover, you should:
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Load the cargo as far forward as possible.
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Load the cargo as far back as possible.
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Load the cargo as low as possible.
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Stack the cargo as high as possible.
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6.
If your trailer beings to drift off course while you are backing, you should:
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Continue trying to back up without stopping.
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Turn the top of your 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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Return the steering wheel to the 12 o’clock position.
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7.
Trailers built before 1975 are:
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Required to have spring brakes.
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Not required to have spring brakes.
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Unsafe to drive.
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Prohibited from public roadways.
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