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Drivers who want to drive combination vehicles must pass the combination vehicles test. The Iowa 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 Iowa CDL Manual. Take this practice test now to prepare for the actual IA CDL combination test!
1. If an item placed on a flatbed trailer is 7 feet long, it should have __ tie-downs.
2. Rollovers happen when drivers:
brake too hard.
turn too slowly.
turn too fast.
3. You are coupling a tractor to a semi-trailer and have backed up but are not yet under the trailer. Before backing under the semi-trailer, you should hook up:
the emergency and service air lines.
the electrical service cable.
the safety chain.
4. Empty trucks require _____ stopping distances because empty vehicles have ______ traction.
greater; less
less; more
greater; more
5. Why should you cover your cargo?
To protect the cargo from weather.
To protect people from spilled cargo.
All of the above.
6. If you must stop on a one-way or divided highway, you should place warning devices _______ toward the approaching traffic.
10, 100 and 200 feet
5, 50 and 500 feet
5, 25 and 50 feet
7. Poor weight balance:
can make vehicle handling more difficult.
improves handling.
increases fuel efficiency.
8. If you're feeling tired while driving you should:
stop driving and get some rest.
eat something.
drink coffee.
9. Fully loaded rigs:
are just as likely to roll over as empty rigs.
are less likely to roll over than empty rigs.
are much more likely to roll over than empty rigs.
10. On front tires, tread should be at least:
4/16 inch
2/32 inch
4/32 inch
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IA CDL Combination Test

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