Iowa cdl Combination - Test 1
Number of questions: 20
Passing score: 80%
Acceptable number of errors: 4
All applicants who are applying for a Class A CDL should be prepared to take the Combination test. This test covers information found in Section 6 of the Commercial Driver License Manual. Section 6 provides the information needed to safely operate tractor-trailers, doubles, triples, and straight trucks with trailers. The test is made up of 20 multiple-choice questions, and applicants will need to correctly answer a minimum of 16 questions to pass. The Combination test is not a replacement for the Double/Triple endorsement test.
To DMV Handbooks20. If you press the tractor air supply control and your trailer's spring brakes do not release, you should:
A
√
Inspect the air line connections.
B
×
Activate the Anti-Lock Braking System.
C
×
Turn the engine off and on again.