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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. Before driving a vehicle with a dual air system, allow time for the air compressor to build up a minimum of ____ pressure in both the primary and secondary systems.
100 psi
50 psi
75 psi
25 psi
2. Which of the following is NOT correct? Anti-lock brakes:
require drivers to apply the brakes as hard as they can without locking the wheels.
help drivers avoid skids caused by over braking.
help drivers avoid wheel lock up.
give drivers more control over the vehicle during braking.
3. Dual tires:
should not come in contact with each other.
are dangerous.
should always come in contact with each other.
should come in contact with each other whenever possible.
4. Brake lag is:
the amount of air pressure required to stop the vehicle.
the distance your vehicle will continue to travel, in ideal conditions, before you hit the brakes.
the distance your vehicle will travel, in ideal conditions, while you are braking.
the time required for the air brakes to work after the brake pedal is pushed.
5. If you are being tailgated, you should:
make quick changes.
open up room in front of you.
increase your speed very gradually.
turn on your taillights.
6. For safe handling, the heaviest trailer should be:
behind the tractor.
the last trailer.
the second trailer in a triple.
None of the above.
7. Dollies with ABS are required to have a malfunction lamp:
on the left side.
on the rear.
on the front.
on the right side.
8. Which of the following statements is true?
There is no way that short circuits due to damaged insulation can cause a vehicle fire.
Under-inflated tires will NOT cause a vehicle fire.
Poor cargo ventilation is a common cause of fire.
Carrying a properly charged and rated fire extinguisher will help prevent fires.
9. Empty trucks:
require the same stoppingĀ distance than full trucks.
require a greaterĀ stopping distance than full trucks.
require a shorter stoppingĀ distance than full trucks.
None of the above.
10. When driving in heavy traffic, the safest speed is:
the same speed as the other vehicles.
faster than the other vehicles.
slower than the other vehicles.
half the speed of the other vehicles.
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WI CDL Doubles Triples Test

Number of questions: 20
Correct answers to pass:16
Passing score:80%
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