Combination
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 25 multiple-choice questions, and applicants will need to correctly answer a minimum of 20 questions to pass. The Combination test is not a replacement for the Double/Triple endorsement test.
Number of Questions
25
Passing Score
20
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To Pass
0
Correct
0
Incorrect
0
10. A loss of air pressure in the emergency line will cause:
The tractor protection valve to close.
The rear trailer to detach from the combination.
The service brakes to activate.
The suspension springs to extend.
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12. What happens when the wheels of a trailer lock up?
The trailer will stop.
The trailer will usually continue to move in a straight line.
The trailer will disengage.
The trailer will likely swing around.
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13. Push in the trailer air supply control to:
Activate the emergency brakes.
Sound the horn.
Supply the trailer with air.
Deactivate the air brakes.
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14. In a vehicle equipped with an automatic tractor protection valve, the valve will pop out when:
You are experiencing a trailer jackknife.
Wheels have regained traction after a skid.
Air pressure drops to a level between 20 and 45 psi.
Air pressure is above 45 psi.
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