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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 average driver has a reaction time of:
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1/16 of a second.
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1/8 of a second.
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3/4 second to 1 second.
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1/32 of a second.
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2.
You should always try to back toward the driver's side because:
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backing toward the left side is more dangerous.
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you can more easily correct any steering errors.
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you can watch the rear of your vehicle out the side window.
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None of the above.
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3.
Air tanks usually hold enough compressed air to allow the brakes to be used _________ even if the compressor stops working.
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for 3 days
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for one stop
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for one day
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several times
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4.
If you hear a loud loud "bang" and the steering feels "heavy", you should:
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pump the brakes until the vehicle has slowed down.
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check your rearview mirrors to see if you have a flat tire.
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brake hard and pull off the road.
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hold the steering wheel firmly and stay off the brake.
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5.
Which of the following is most likely to roll over?
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The rear trailer of a triple
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The front trailer of a double
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The rear trailer of a double
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The middle trailer of a triple
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6.
If you must make an emergency stop, you should:
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use the hand brake before the brake pedal.
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brake in a way that will keep your vehicle in a straight line.
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apply the brakes as hard as you can to lock them.
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None of the above.
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7.
The safety valve installed in the first tank the air compressor pumps air is set to open:
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at 30 psi.
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every 15 minutes.
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if there is too much pressure.
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if there is too little pressure.
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8.
When driving with more than one trailer, the _______ trailer should be the first one behind the tractor.
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heaviest
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lightest
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shortest
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longest
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9.
When you push in the red trailer air supply knob, this will:
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open the emergency line shut-off valve at the rear of the last trailer.
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supply air to the emergency supply lines.
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disconnect the electrical connector.
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disconnect the air lines from the trailer.
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10.
When transporting cargo, cargo securement must be checked within the first _____ miles of a trip and every _____ miles after.
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150; 250
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50; 250
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50; 150
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100; 150
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