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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 Wisconsin doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The WI CDL doubles triples test covers the following sections of the Wisconsin CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this WI CDL practice test now to prepare for the actual test!
1.
Hydroplaning:
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can occur only if there is a lot of water on the road.
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is less likely if tire pressure is low.
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can occur at speeds as low as 10 mph, if there is a lot of water.
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can occur at speeds as low as 30 mph.
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2.
If the low air pressure warning light comes on, you should:
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continue to drive normally.
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set the parking brake.
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stop immediately.
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call for help.
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3.
To prevent rollover, you should:
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keep the cargo as close to the ground as possible.
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go slowly around turns.
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drive slowly around on ramps and off ramps.
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All of the above.
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4.
When driving in hot weather, drivers should inspect tires:
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every 2 hours or every 100 miles.
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every hour or every 50 miles.
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every 3 hours or every 75 miles.
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every 4 hours or every 200 miles.
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5.
In vehicles with air brakes, the air compressor governor:
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controls when the air storage tanks will pump air into the air compressor.
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controls how much air the air compressor will pump into the air storage tanks.
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controls when the air compressor will pump air into the air storage tanks.
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None of the above.
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6.
If the safety relief valve in the air brake system releases air:
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something is wrong.
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this will supply more power to the brakes.
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this will supply more power to the drive wheels.
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the valve is fully operational.
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7.
Which of the following is NOT true?
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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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ABS won't compensate for bad brakes.
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ABS won't compensate for poor brake maintenance.
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8.
When driving double and triple trailers, drivers should:
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allow more following distance.
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steer gently and go slowly around corners.
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look far ahead.
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All of the above.
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9.
Which of the the following statements about fatigue is true?
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Fatigued driving is one of the leading causes of accidents.
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Fatigue may cause you to not see and react to hazards.
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Fatigue impairs your vision and judgment.
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All of the above.
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10.
Air tank drains:
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protect the tanks and the rest of the system from too much pressure.
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should not be used in wet weather.
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are used to remove water and oil from the air tanks.
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are used to move air to the brakes.
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