2025 Iowa Cdl Combination - Test 2
The following questions are from real Iowa CDL practice tests. After selecting the answer, you can see the explanation. After confirming, click "Next" to jump to the next question.
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1. Before a trip, you can make sure air flows to all trailers by:
Checking for moving air inside of each trailer.
Listening for air at the rear shut-off valve.
Feeling for air at the front shut-off valve.
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Key Data
Number of Tests: 18
Number of Question: 20
Passing Score: 16
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