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Colorado 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 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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Passing grade —
4 or fewer errors
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1.
To lower the risk of a rollover, you should:
Load the cargo as far forward as possible.
Load the cargo as far back as possible.
Load the cargo as low as possible.
Stack the cargo as high as possible.
2.
Starting in which year were newly manufactured trailers required to have ABS?
1972
1987
1998
2004
3.
While inspecting a coupling, you should go under the trailer and:
Detach the jaws from around the kingpin.
Make sure the locking lever is in the "emergency" position.
Remove the safety latch.
Look into the back of the fifth wheel.
4.
To test the trailer service brakes, you should:
Move the vehicle forward slowly and apply the brakes with the brake pedal.
Reverse the vehicle slowly and apply the brakes with the hand control.
Reverse the vehicle slowly and apply the brakes with the brake pedal.
Move the vehicle forward slowly and apply the brakes with the hand control.
5.
The emergency air line:
Is controlled by the foot brake.
Is connected to the relay valves.
Supplies air to the trailer air tanks.
Prevents skids.
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.
Using the trailer hand brake while experiencing a trailer jackknife will:
Stop the skid.
Straighten the trailer.
Increase traction.
Continue the skid.
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