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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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Wisconsin CDL Permit Test - Combination
(From the 2020 Wisconsin 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 Wisconsin Commercial Driver's 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
advertising
1.
When driving a bobtail tractor, you should be aware that:
2.
To test the trailer service brakes, you should:
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Move the vehicle forward slowly and apply the brakes with the brake pedal.
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Reverse the vehicle slowly and apply the brakes with the hand control.
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Reverse the vehicle slowly and apply the brakes with the brake pedal.
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Move the vehicle forward slowly and apply the brakes with the hand control.
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3.
Before a drive, ensure that air flows to all trailers by:
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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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4.
Using the trailer hand valve while driving:
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Will help you turn safely.
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Will stop your trailer safely.
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Can cause a skid.
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Is impossible.
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5.
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 downhill.
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Should never be used for parking.
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Should only be used when transporting cargo.
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6.
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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7.
Starting in which year were newly manufactured trailers required to have ABS?
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1972
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|
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1987
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|
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1998
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2004
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