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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.
A bridge formula permits:
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less maximum axle weight for axles that are far apart.
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more maximum axle weight for axles that are closer together.
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less maximum axle weight for axles that are close together.
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2.
The center of gravity of a trailer should be:
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at the rear of the trailer.
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as low as possible.
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as high as possible.
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3.
If driving a heavy vehicle, you should:
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stay in the right lane.
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stay in the left lane.
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try to pass other vehicles going uphill.
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4.
Which of the following is not a sign of fatigue?
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Frequent blinking
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Keeping a steady speed
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Rubbing eyes
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5.
You can determine if your vehicle is equipped with ABS (anti-lock braking system) by:
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checking if your vehicle was manufactured after March 1, 1998.
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checking for a yellow ABS malfunction lamp on the instrument panel.
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All of the above.
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6.
When conducting a pre-trip inspection:
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the inspection report should only be reviewed if you will be carrying passengers.
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the vehicle inspection report should not be reviewed unless your supervisor tells you to do so.
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you should review the last vehicle inspection report.
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7.
When parking a trailer without spring brakes, it is very important for safety that you use wheel chocks. Why?
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You may not notice a major leak in the service line until you try to put the brakes on.
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The air could leak out of the trailer air tank, releasing its emergency brakes.
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if you don't use wheel chocks, supply air will be sent to the service line instead of going to charge the trailer air tanks.
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8.
You should do an after-trip inspection:
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after each trip.
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at least once a week.
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once a month.
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9.
In a dual air brake system, if one air system is very low on pressure:
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you should drive and brake as you always have.
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either the front or rear brakes will not be operating fully.
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you should pump the brakes to restore pressure.
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10.
You are driving a modern truck with a manual transmission. When going down a hill you should usually:
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shift into neutral and coast.
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use a lower gear than would be required to go up the hill.
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use the same gear you would use to go up the hill.
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