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Vermont 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 Vermont 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.
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4 or fewer errors
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1.

Rearward amplification refers to:

The amount of noise projected to the rear of a vehicle.
The cause of the "crack-the-whip" effect.
The number of trailers that can be pulled by a tractor.
2.

To prevent a rollover, cargo should be:

Loaded with most weight on the driver’s side of the trailer.
Placed near the rear of the trailer.
Spread out in the trailer.
3.

If you cannot reverse your trailer in a straight path, you should:

Swerve back and forth while backing.
Back toward the driver's side.
Back toward the passenger's side.
4.

When coupling, after you've connected the air lines to the trailer, you should:

Supply air to the trailer.
Activate the emergency brake.
Disconnect the glad hands.
5.

When braking while pulling a trailer equipped with anti-lock brakes, you should:

Pump the brakes.
Use extra braking force to ensure the brakes kick in.
Brake as you would without anti-lock brakes.
6.

When you are pulling a trailer, the air supply control lever should be in its ____ position.

Emergency
Supply
Normal
7.

The tractor protection valve:

Ensures that oil adequately lubricates the engine.
Protects the tractor from exceeding a set speed.
Keeps air in the truck braking system if the trailer develops a leak.
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