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Drivers who want to drive combination vehicles must pass the combination vehicles test. The Indiana CDL combination test consists of 20 questions, and you'll need at least 16 correct answers to pass (80%). The test covers the combination vehicles section of the Indiana CDL Manual. Take this practice test now to prepare for the actual IN CDL combination test!
1. If the spring brakes do not release when you push the trailer air supply control, you should:
check the air line connections.
check the electrical cables.
rev or lug the engine.
pump the brakes.
2. With brake drums, if brakes become too hot:
the brakes may stop working.
the brakes will supply too much power to the drive wheels.
the air compressor will kick on to cool the brakes.
your ABS will malfunction.
3. Glad hands are:
warning devices.
securement devices.
coupling devices.
electronic devices.
4. Broken suspension parts can be very dangerous. When inspecting your vehicle for suspension system defects, look for:
Spring hangers that allow movement of axle from proper position.
Damaged air suspension systems.
Broken leaves in a multi-leaf spring.
All of the above.
5. Which of the following may have reduced the clearances since the heights were posted at bridges and overpasses?
The weight of a cargo
Repaving of the road
6. If you have convex mirrors, be aware that:
everything appears smaller in a convex mirror than it would if you were looking at it directly.
objects may appear to be faster than they really are.
in a convex mirror objects appears larger than they really are.
objects seem closer than they really are.
7. If your truck catches fire, the first thing you should do is to:
get off the vehicle, open the hood and start shooting foam to keep the engine cool.
pull off the road and park in an open area.
pull into a service station and call for help.
get the vehicle off the road and park near other vehicles.
8. Older trailers do not have spring brakes. If the air supply leaks away:
there will be no emergency brakes.
the trailer will stop normally.
the ABS won't work properly.
All of the above.
9. Glad hands are used to:
connect the electrical lines from the truck or tractor to the trailer.
connect the brakes from the truck or tractor to the trailer.
connect the service and emergency air lines from the truck or tractor to the trailer.
the air compressor is connected to the engine.
10. When should you use chocks to park a trailer without spring brakes?
Only when parking downhill
Only when parking uphill
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IN CDL Combination Test

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