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DOUBLES TRIPLES TEST IN - CDL PRACTICE TEST

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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. When should you be particularly careful about high winds?
When going downhill
When driving at night
When driving in winter
When emerging from a tunnel
2. Excessive use of the service brakes results in overheating. Too much heat can:
make the brakes stop working.
cause the brakes to squeak.
cause the brakes apply unevenly.
cause the brakes to grab.
3. Driving in very hot weather:
can make it difficult to stay in your lane.
can increase tire pressure.
should never be done.
can decrease oil pressure.
4. Before driving a vehicle with a dual brake brake system, the driver should:
wait at least 5 minutes before driving.
wait at least 10 minutes before driving.
pump the brake pedal 10 times to build pressure.
allow time for the air compressor to build up a minimum of 100 psi pressure in both the primary and secondary systems.
5. Doubles and triples are:
easier to drive than other combination vehicles.
more likely to turn over than other combination vehicles because of the "crack-the-whip" effect.
less likely to turn over than other combination vehicles.
more stable than straight trucks.
6. If there is a cargo fire in a van or box trailer, you should:
open the doors, especially if your cargo contains hazardous materials.
enlist the help of bystanders.
keep the doors shut.
keep driving until you reach help.
7. Engine oil pressure should come up to normal within _________ after the engine is started.
ten minutes
seconds
five minutes
two minutes
8. A bridge formula permits:
more maximum axle weight for axles that are far apart.
less maximum axle weight for axles that are close together.
more maximum axle weight for axles that are closer together.
less maximum axle weight for axles that are far apart.
9. Which of the following is NOT a reason for hydraulic brake failure?
Brake fade on long hills
Loss of hydraulic pressure
Stab braking
All of the above.
10. When you push in the red trailer air supply knob, this will:
disconnect the electrical connector.
supply air to the emergency supply lines.
open the emergency line shut-off valve at the rear of the last trailer.
disconnect the air lines from the trailer.
 
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IN CDL Doubles 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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