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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 Missouri doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The MO CDL doubles triples test covers the following sections of the Missouri CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this MO CDL practice test now to prepare for the actual test!
1.
Drivers transporting cargo are responsible for:
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recognizing overloads.
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inspecting the cargo.
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All of the above.
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2.
If your vehicle is hydroplaning, you should:
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speed up.
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put the vehicle in reverse.
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stay off the brake.
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3.
Front-end header boards:
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should never be used.
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protect drivers from spilled cargo.
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protect drivers from cargo in case of an accident or emergency stop.
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4.
The weight of a truck:
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has no effect on stopping distance.
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is not as important as the vehicle's center of gravity in determining stopping distance.
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has an impact on stopping distance.
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5.
Radial and bias-ply tires:
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should be used together only when driving in packed snow.
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should be used together.
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should not be used together.
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6.
You must have at least _____ inch tread depth in every major groove on front tires.
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2/32
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4/32
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6/32
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7.
When you make a quick lane change, the crack-the-whip effect can turn the trailer over. The crack-the-whip effect is caused by:
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the rear trailer of a triple.
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rearward amplification.
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strong wind.
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8.
To reduce the chance of rollover, you should:
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place the cargo as high as possible inside the trailer.
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put the lightest parts of the cargo under the heaviest parts.
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distributed the cargo as low as possible inside the trailer.
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9.
Which of the following is NOT true?
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ABS won't compensate for bad brakes.
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ABS will change the way you normally brake.
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ABS only comes into play when a wheel would have locked up because of over braking.
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10.
If there is a cargo fire in a van or box trailer, you should:
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open the doors, especially if your cargo contains hazardous materials.
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enlist the help of bystanders.
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keep the doors shut.
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