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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 Indiana doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The IN CDL doubles triples test covers the following sections of the Indiana CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this IN CDL practice test now to prepare for the actual test! Important: Triple trailers are not legal in Indiana.
1. Truck tractors with air brakes built after March 1, 1997, are required to be equipped with:
anti-lock brakes.
hydraulic brakes.
a rear backup camera.
2. When a tire fails, you should:
brake in a way that will keep your vehicle in a straight line.
apply the brakes as hard as you can without locking the wheels.
stay off the brake.
push the brake pedal down gradually.
3. For a cargo fire in a box trailer, you should:
wait 10 minutes before opening the doors.
keep the doors shut.
open the doors immediately and use the fire extinguisher.
use the fire extinguisher on the doors.
4. Before connecting the converter dolly to the rear trailer, make sure that:
the kingpin rests on the fifth-wheel.
the shut-off valves at the rear of the first trailer are open.
the trailer height is slightly lower than the center of the fifth-wheel.
the locking jaws rest on the kingpin.
5. Your vehicle has hydraulic brakes. When you press the brake pedal while driving and the pedal goes to the floor, remember that:
shifting into neutral may help slow the vehicle.
pumping the brake pedal may generate enough hydraulic pressure to stop the vehicle.
the parking brake should never used to slow the vehicle.
All of the above.
6. Most heavy trucks with manual transmissions require ____ to change gears.
single clutching
triple clutching
double clutching
None of the above.
7. After starting the engine, the ABS light stays on. This means:
the ABS is working properly.
the ABS is in Neutral.
the ABS is not working properly.
the ABS oil level is not adequate.
8. To prevent rollover, you should:
keep the cargo as close to the ground as possible.
go slowly around turns.
drive slowly around on ramps and off ramps.
All of the above.
9. When more than one semitrailer is behind the tractor:
the lighter trailer should be in the rear.
the more heavily loaded semitrailer should be in the rear.
The order doesn't matter.
the more heavily loaded trailer should be disconnected.
10. _________ rigs are much more likely to roll over in an accident than _________ rigs.
Empty ; overloaded
Fully loaded ; overloaded
Empty ; fully loaded
Fully loaded ; empty
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IN CDL Doubles Triples Test

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