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Illinois CDL Permit Test - Combination

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.
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1.
Which of the following types of vehicles is most prone to the “crack-the-whip" effect?
An automobile
A three-axle tractor
A bobtail tractor
A triple combination
2.
Compared to other commercial motor vehicles, combination vehicles need more space on the road because they are longer and they:
Need more space to turn and stop.
Drive more slowly.
Are twice the width.
Swerve more often.
3.
The emergency air line:
Is controlled by the foot brake.
Is connected to the relay valves.
Supplies air to the trailer air tanks.
Prevents skids.
4.
Using the trailer hand brake while experiencing a trailer jackknife will:
Stop the skid.
Straighten the trailer.
Increase traction.
Continue the skid.
5.
A trailer will be most likely to swing around when:
It is full.
Traveling in a straight line.
It is empty.
The wheels are rotating.
6.
To test the trailer service brakes, you should:
Move the vehicle forward slowly and apply the brakes with the brake pedal.
Reverse the vehicle slowly and apply the brakes with the hand control.
Reverse the vehicle slowly and apply the brakes with the brake pedal.
Move the vehicle forward slowly and apply the brakes with the hand control.
7.
When driving a tractor-trailer equipped with ABS, you should:
Stop harder than you would otherwise.
Use extra braking force to ensure the ABS kicks in.
Brake as you normally would.
Brake using less pressure than you would otherwise use.
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