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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.
What should you do if you doubt you have safe space to pass under a low bridge?
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Go slowly, and take another route if you are not sure you can make it.
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Assume that the height posted at the bridges is correct.
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If no warnings are posted, assume there is enough clearance under the bridge and proceed slowly.
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Increase the weight of your vehicle to clearing under the bridge.
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2.
On front tires, tread should be at least:
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2/32 inch
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1/16 inch
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4/16 inch
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4/32 inch
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3.
In vehicles with air brakes, the two markings on a front brake limiting valve are:
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wet and dry.
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normal and slippery.
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left and right.
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high and low.
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4.
ABS helps you:
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drive faster.
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brake harder.
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stop faster.
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None of the above.
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5.
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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air escaping from the open valve.
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a thumping sound.
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a mechanical vibration.
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the service line valve close.
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6.
Over-length loads:
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may require special equipment such as "wide load" or flags.
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require special driving care.
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require special transit permits.
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All of the above.
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7.
If your trucks has a high center of gravity, which of the following is true for curves?
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You should travel at the posted speed limit.
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Reduce your speed to a crawl.
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You should slow down, as your truck can roll over at the posted speed limit for the curve.
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None of the above.
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8.
Tire load is defined as:
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the weight transmitted to the ground by 1 tire.
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the minimum safe weight a tire can carry at a specified pressure.
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the maximum safe weight a tire can carry at a specified pressure.
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the minimum tire pressure.
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9.
Blocking is used to:
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protect people from spilled cargo.
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keep the cargo from sliding.
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protect the cargo from weather.
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All of the above.
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10.
Because of the "crack-the-whip" effect, doubles and triples:
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can go much faster than other combination vehicles.
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are more likely to turn over than other combination vehicles.
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are much slower than other combination vehicles.
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are more likely to run out of gas than other combination vehicles.
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