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Massachusetts 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 Commercial Driver License Manual. 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.
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Passing grade —
4 or fewer errors
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1.
Most heavy-duty vehicles use:
Mono air brake systems.
Dual air brake systems.
Triple air brake systems.
Quadruple air brake systems.
2.
When you leave your vehicle, you should:
Apply the parking brake.
Apply the air brake.
Not apply any brake.
Leave the door open.
3.
After a trip:
A vehicle should be placed out-of-service.
A vehicle's oil should be changed.
A vehicle's after-trip inspection should be completed.
A vehicle's battery should be disconnected.
4.
If the brakes “pull” to one side or the other when you use them, it's a sign that:
The brakes are working properly.
The brakes need to be checked.
The brakes are new.
The brakes have too much stopping power.
5.
If you are driving and your trailer begins to jackknife, you should not:
Release the brakes.
Allow the trailer to straighten out.
Apply the trailer hand brake.
Allow the wheels to grip the road.
6.
To help prevent rollovers, you should:
Accelerate quickly after stopping.
Drive slowly around turns.
Keep the load near the back of the trailer.
Keep the load on one side of the trailer.
7.
A convex mirror is sometimes called a ____ mirror.
Bug-eye
Square
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