While CDL standards are federal, the actual exam questions may vary slightly from state to state.
Questions in set
45
Per attempt
25
Passing score
20
Explanations
Every question
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What Coupling System Checks Are Tested on the CDL Pre-Trip Inspection?
Combination vehicles add a coupling system check to the CDL Pre-Trip Inspection: the fifth wheel, kingpin, locking jaws, air and electric lines, and mounting hardware.
Rather than isolating that one category, test 3 blends coupling questions with engine, brake, and lighting items from across the full 45-question set, with 25 questions per attempt and answer explanations throughout.
