ME CDL DOUBLES TRIPLES TEST - PRACTICE TEST
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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 Maine doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The ME CDL doubles triples test covers the following sections of the Maine CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this ME CDL practice test now to prepare for the actual test!
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1.
When inspecting the coupling, how much space should there be between the upper and the lower fifth-wheel?
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It depends on the trailer
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½ inch
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None.
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2.
Tire load is defined as:
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the minimum safe weight a tire can carry at a specified pressure.
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the weight transmitted to the ground by 1 tire.
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the maximum safe weight a tire can carry at a specified pressure.
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3.
ABS:
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helps you avoid skids caused by over braking.
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improves your visibility at night.
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helps you stop faster.
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4.
On any upgrade, gravity:
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speed you up.
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slows you down.
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doubles your speed.
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5.
To prevent rollover, you should do all of the following except:
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drive slowly around turns.
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put the lightest parts of the cargo under the heaviest parts.
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keep the load centered on your rig.
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6.
Older trailers do not have spring brakes. If the air supply leaks away:
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the ABS won't work properly.
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there will be no emergency brakes.
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the trailer will stop normally.
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7.
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:
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a mechanical vibration.
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air escaping from the open valve.
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the service line valve close.
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8.
In your mirror, you see a car approaching from the rear. The next time you check your mirror, you don't see the car. If you wish to change lanes, you should:
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ease into the other lane slowly so the other car can get out of the way.
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assume the car left the roadway and change lanes as normal.
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wait until you are sure the car isn't in your blind spot.
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9.
With the controlled braking method:
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you lightly tap the brakes.
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you apply your brakes as hard as possible without locking the wheels.
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you apply your brakes all the way and release the brakes when the wheels lock up.
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10.
Longer combination vehicles have the tendency to swing wide on turns. This is called:
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hydroplaning.
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off-tracking.
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jackknifing.
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ME Doubles Triples Test
| Number of questions: | 20 |
| Correct answers to pass: | 16 |
| Passing score: | 80% |
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