Instructions

Double

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.. Read More

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 Hampshire CDL Driver’s 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.

Number of Question 20

Passing Score 16

1. The emergency air line supplies air to the:

Relay valves.

Trailer air tanks.

Signal line.

The emergency air line (also known as the supply line) has two functions. The first is to supply air to the trailer air tanks, and the second is to control the emergency brakes on combination vehicles.

2. Why should the steps of a pre-trip inspection be done in the same order each time?

Because you will be less likely to forget to check something

Because it will be faster

Because it is required by law

Pre-trip inspections should be conducted in the same way every time. This will reinforce the steps, making it less likely that you will forget to inspect something important.

3. When changing lanes, you should:

Move quickly before other vehicles get into the lane you wish to occupy.

Move slowly, in case another vehicle is in the lane you wish to occupy.

Not use your turn signal.

Never use the right lane.

Always change lanes slowly and smoothly. If you did not see drivers who are already using the lane you wish to occupy, this will give them a chance to get out of your way or honk their horns to alert you. Always signal before changing lanes.

4. If turning to avoid a hazard:

You should brake hard.

You should not brake as it may cause the wheels to lock.

You should turn very sharply.

You should not brake while making a quick turn to avoid a hazard. Doing so could cause your wheels to lock and make your vehicle skid out of control.

5. A combination vehicle has ____ air line(s).

One

Two

Three

Every combination vehicle has two air lines: the service line and the emergency line.

6. If your vehicle gets stuck on railroad tracks, you should:

Sit in the cab and call for help.

Exit the cab and walk away from the tracks.

Motion for another driver to push your vehicle.

If your vehicle gets stuck on railroad tracks for any reason, you should immediately exit the vehicle and walk away from the tracks. Contact the proper emergency authorities.

7. People working on a disabled vehicle:

Are probably aware of the roadway.

May be distracted by the repair and not pay attention to the roadway.

Are exempt from traffic laws.

Be cautious when driving near people who are working on a disabled vehicle on the side of the road. They may be focused on the repair and not paying attention to nearby traffic.

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