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Missouri CDL Permit Test - Combination

Number of questions: 20
Passing score: 16
Directions: 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 Missouri 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.
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1.
Fully-loaded rigs:
Usually are very responsive to steering.
Are more likely to roll over than empty rigs.
Can stop quickly.
2.
Operating combination vehicles usually requires ­­­­­____ operating single vehicles.
Less skill than
About the same level of skill as
More skill than
3.
The service air line is often controlled by the foot brake and is attached to the ____ valves.
Relay
Supply
Emergency
4.
Older trailers are not equipped with spring brakes. This means that if the air supply for a vehicle's air braking system leaks away:
The trailer will stop normally.
The trailer will not have brakes.
The trailer will speed up.
5.
When coupling, after you've connected the air lines to the trailer, you should:
Supply air to the trailer.
Activate the emergency brake.
Disconnect the glad hands.
6.
In an empty combination vehicle, the stiff suspension springs and strong brakes will have:
High traction.
Low traction.
No traction.
7.
When braking while pulling a trailer equipped with anti-lock brakes, you should:
Pump the brakes.
Use extra braking force to ensure the brakes kick in.
Brake as you would without anti-lock brakes.
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