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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.
The safety valve is usually set to open at:
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100 psi.
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200 psi.
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75 psi.
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150 psi.
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2.
You must have at least 4/32 inch tread depth in every major groove on front tires and at least ___ inch on other tires.
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4/32
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2/32
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3/32
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1/32
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3.
Alcohol:
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improves muscle coordination.
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impairs depth perception.
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improves reaction time.
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does not affect judgement.
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4.
Doubles and triples:
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have a lower chance of skidding.
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can't be turned suddenly.
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can be stopped suddenly due to their weight.
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can be turned suddently due to the low center of gravity.
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5.
If your vehicle is hydroplaning, you should:
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put the vehicle in reverse.
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stay off the brake.
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apply the brakes.
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speed up.
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6.
If during vehicle inspection a tire is too hot to touch, you should:
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immediately decrease air pressure.
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make sure there is enough engine oil on the tires.
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remain stopped until the tire cools off.
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let air out.
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7.
When trying to put out an electrical fire you should:
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use a B or C extinguisher.
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use water.
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use an D extinguisher.
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use an A extinguisher.
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8.
The trolley valve should be used only:
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to prevent skids.
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in driving.
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to test the trailer brakes.
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in an emergency.
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9.
No matter how small the cargo is, it should have at least:
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6 tie-downs.
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2 tie-downs.
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1 tie-down.
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4 tie-downs.
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10.
An ABS system:
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helps increase a vehicle's stopping power.
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decreases your stopping distance.
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requires a change in the way you brake.
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is a safety anti-skid braking system.
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