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Safely pulling double and triple trailers requires knowledge and skill. If you want to pull double or triple trailers, you must add the Doubles/Triples (T) endorsement to your Class A CDL. The Massachusetts doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The MA CDL doubles triples test covers the following sections of the Massachusetts CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this MA CDL practice test now to prepare for the actual test!
1. Engine oil pressure should come up to normal within _________ after the engine is started.
two minutes
ten minutes
five minutes
2. You should be especially alert for drunk drivers:
in the morning.
in the early evening.
late at night.
around shopping areas.
3. As part of your vehicle inspection, you are checking that air flows to all trailers. After using the trailer handbrake to provide air to the service line, you go to the rear of the rig. When you open the emergency line shut-off valve at the rear of the last trailer, you should hear:
air escaping from the open valve.
the service line valve close.
a thumping sound.
a mechanical vibration.
4. If your brakes fail on a steep mountain downgrade, you should:
slow down until your vehicle comes to a complete stop.
decide what to do as soon as you know your brakes do not work.
stay on the road and keep looking for the next available escape ramp.
set the parking brake and park in an open area.
5. Glad hands are:
coupling devices.
warning devices.
electronic devices.
securement devices.
6. When the trailer breaks away or develops a bad leak, the tractor protection valve will close automatically and:
the tractor will lose all air pressure.
the trailer emergency brakes will come on.
the engine will shut down.
the trailer supply valve will stay open.
7. How should you brake if your vehicle loses ABS?
Stay off the Brake
Pump the brake repeatedly
Brake as you always have.
Step on and off the brake pedal several times
8. When your vehicle starts to skid, you must take action to:
use controlled braking.
accelerate and countersteer.
restore traction to the tires.
use stab braking.
9. Most heavy-duty vehicles use:
solid brakes.
hydraulic brakes.
pressure brakes.
air brakes.
10. Truck tractors with air brakes built after March 1, 1997, are required to be equipped with:
a rear backup camera.
hydraulic brakes.
anti-lock brakes.
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MA Doubles Triples Test

Number of questions: 20
Correct answers to pass:16
Passing score:80%
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