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Drivers who want to drive combination vehicles must pass the combination vehicles test. The Montana 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 Montana CDL Manual. Take this practice test now to prepare for the actual MT CDL combination test!
1. When the wheels of a trailer lock up, the trailer will tend to swing around. This is more likely to happen when:
the trailer is fully loaded.
the trailer is overloaded.
the trailer is empty or lightly loaded.
None of the above.
2. Headache racks:
protect you from being hit by your cargo.
can blind other drivers.
help you keep weights within legal limits.
None of the above.
3. When you make a quick lane change, the crack-the-whip effect can turn the trailer over. The crack-the-whip effect is caused by:
worn tire tread.
the rear trailer of a triple.
rearward amplification.
strong wind.
4. If your trailer starts to skid, you should:
release the brakes.
steer in the opposite direction.
lock the brakes.
pump the brakes.
5. After supplying air to the trailer brake system, you should check the brake system for crossed air lines by:
shutting the engine off so you can hear the brakes.
checking the air brake system pressure gauge for signs of major air loss.
applying and releasing the trailer brakes and listening for the sound of trailer brakes.
All of the above.
6. "Bobtail" tractors are:
tractors with a tank.
heavily loaded trailers.
tractors with two trailers.
tractors without semitrailers.
7. Weight that is loaded so there is a high center of gravity:
reduces the chance that the load will shift to the side or fall off.
makes a vehicle easier to handle.
causes greater chance of rollover.
All of the above.
8. Older trailers do not have spring brakes. If the air supply leaks away:
there will be no emergency brakes.
the ABS won't work properly.
the trailer will stop normally.
All of the above.
9. The trailer hand valve should be used only:
to test the trailer brakes.
in driving to prevent skids.
only in combination with the foot brake.
when the trailer is fully loaded.
10. After the pre-trip inspection, drivers should inspect their cargo and its securing devices again within ________ after beginning the trip.
25 miles
50 miles
20 miles
two hours
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MT CDL Combination Test

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