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Minnesota 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 Minnesota Commercial Driver's 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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Passing grade —
4 or fewer errors
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1.
When coupling:
You can assume all vehicles are the same.
Be sure that you are coupling correctly.
Cracks in the mounting are acceptable.
2.
Failure to keep the fifth wheel plate properly greased could:
Cause the trailer to disconnect.
Cause steering problems.
Cause braking problems.
Affect the lights.
3.
If a load is placed on one side of a trailer, the trailer:
May lean during turns.
May add extra support during turns.
May be easier to steer during turns.
4.
If a trailer begins to skid, the driver should:
Lock the brakes.
Release the brakes.
Steer in the opposite direction.
Accelerate.
5.
Before a drive, ensure that air flows to all trailers by:
Opening the rear shut-off valves and listening for escaping air.
Closing the rear shut-off valves and listening for escaping air.
Disconnecting air supply lines and listening for escaping air.
Rolling each trailer down a hill and testing the brakes.
6.
If unsure if a trailer is equipped with ABS, you can:
Check under the trailer for wheel speed sensors coming from the back of the brakes.
Try driving on a slippery surface and see if ABS kicks in.
Assume it does have ABS.
Remove a tire and look for the ABS sensor on the axle.
7.
If a parked trailer does not have spring brakes, you should keep the trailer from moving by:
Having the vehicle parked against a wall or other vehicle.
Using chock blocks.
Parking on a slight incline.
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