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. Test questions come from the Ohio Commercial Driver’s 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.

Number of Question
Passing Score

1. When entering a curve, you should:

Explanation
You should always slow down to a safe speed and shift into a lower gear before entering a curve.

2. When applying your brakes, the vehicle should:

Explanation
Your vehicle pulling to one side or the other while you are braking can indicate trouble with the brakes.

3. Of the following, which is the most slippery surface?

Explanation
Ice becomes wet when the weather is just warm enough to melt the ice slightly. Wet ice is much more slippery than ice that is not wet.

4. During a static leakage test, what is the maximum leakage rate that is safe for a double combination vehicle?

Explanation
When performing a static leakage test on a double combination vehicle with air brakes, the leakage rate should be no more than 3 psi in one minute. If the air leaks from the air brake system at a quicker rate, the vehicle should not be driven because something likely needs to be repaired.

5. When you are about to start down a hill, you should switch into a ____ gear.

Explanation
Before starting down a hill, be sure to switch into a low gear. Gravity will increase your vehicle's speed as you travel downhill.

6. The air compressor is connected to the:

Explanation
The air compressor of an air brake system is connected to the engine through gears or a v-belt. The compressor may be air-cooled or cooled by the engine cooling system.

7. If air pressure drops to a level between ____, a visual low pressure warning signal should have already activated.

Explanation
A visual low pressure warning signal should activate before air pressure drops to a level between 55 and 75 psi. This signal could be a light, a buzzer, or a wig wag.
DMV Writen Test Logo