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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.
You have made error so far
Passing grade —
4 or fewer errors
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1.
Failure to keep the fifth wheel plate properly greased could:
Cause the trailer to disconnect.
Cause steering problems.
Cause braking problems.
Affect the lights.
2.
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.
3.
When coupling:
You can assume all vehicles are the same.
Be sure that you are coupling correctly.
Cracks in the mounting are acceptable.
4.
If a trailer begins to skid, the driver should:
Lock the brakes.
Release the brakes.
Steer in the opposite direction.
Accelerate.
5.
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.
6.
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.
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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