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New Jersey CDL Permit Test - Double

Number of questions: 20
Passing score: 16
Directions: This endorsement is required if the driver will pull two or three trailers. To receive this endorsement, applicants must pass a test. The test consists of 20 multiple choice questions. To pass, the applicant must answer at least 16 questions correctly. Each question has four possible answer choices. Test questions come from the New Jersey Commercial Driver Guide. Questions come from chapters covering: Driving Safely, Air Brakes (if applicable), Combination Vehicles and Doubles and Triples. The Double/Triple endorsement can be used with the Class A CDL.
You have made error so far
Passing grade —
4 or fewer errors

Driving at night is:

Safer than driving during the day.
Just as safe as driving during the day.
More dangerous than driving during the day.

An Anti-Lock Braking System (ABS):

Cannot be used with air brakes.
Should be used on dry pavement.
Can assist in maintaining control when braking.
Should only be used if all axles have ABS.

Truck tractors with air brakes built on or after March 1, 1997 must have:

An Anti-Lock Braking System (ABS).
A rear back-up camera.

Test the tractor protection valve by:

Removing the air supply knob.
Removing the parking brake control knob.
Releasing air with the brake pedal.
Releasing air with the gas pedal.

Improper coupling is:

Not a problem.
Not easily detected.
Very dangerous.

In poor weather, the driver of a double or triple should:

Lead the way for other drivers.
Drive on the shoulder of the road.
Exceed the posted speed limit.
Drive carefully, as the vehicle is prone to skidding.

When approaching a downgrade, how can you reduce the amount of braking that will be needed?

Switch to a higher gear.
Switch to a lower gear.
Switch to neutral.
Turn off the engine.
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