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Using the air brakes.
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Using wheel chocks.
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Parking near a wall.
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Parking on a slight incline.
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District Of Columbia CDL Permit Test - Combination
(From the 2021 District Of Columbia CDL driver handbook)
| 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 have one hour to correctly answer a minimum of 16 questions. The Combination test is not a replacement for the Double/Triple endorsement test.
Passing grade —
4 or fewer errors
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1.
If a parked trailer does not have spring brakes, you should keep the trailer from moving by:
2.
In a combination rig, it is best to make:
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Quick, sudden stops.
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Sharp turns.
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Quick accelerations.
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Slow, planned stops.
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3.
A combination vehicle has:
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One air line.
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Two air lines.
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Three air lines.
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Four air lines.
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4.
Failure to keep the fifth wheel plate properly greased could:
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Cause the trailer to disconnect.
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Cause steering problems.
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Cause braking problems.
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Affect the lights.
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5.
Avoid needing to make sudden lane changes by:
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Using your horn to encourage other drivers to move out of your lane.
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Only driving slower than the posted speed limit.
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Watching the road ahead while driving.
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Pulling off the road and waiting when there is high traffic.
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6.
During a trip, which shut-off valves should be open?
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All shut-off valves should be open.
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The rear shut-off valves should be open.
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All shut-off valves should be in the open position, except the rear shut-off valves.
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No shut-off valves should be open.
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7.
If a load is placed on one side of a trailer, the trailer:
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May lean, and could result in a rollover.
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May add extra support during turns.
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Have improved braking.
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Have improved steering.
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