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District Of Columbia 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 have one hour to correctly answer a minimum of 16 questions. 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

If a parked trailer does not have spring brakes, you should keep the trailer from moving by:

Using the air brakes.
Using wheel chocks.
Parking near a wall.
Parking on a slight incline.

In a combination rig, it is best to make:

Quick, sudden stops.
Sharp turns.
Quick accelerations.
Slow, planned stops.

A combination vehicle has:

One air line.
Two air lines.
Three air lines.
Four air lines.

Failure to keep the fifth wheel plate properly greased could:

Cause the trailer to disconnect.
Cause steering problems.
Cause braking problems.
Affect the lights.

Avoid needing to make sudden lane changes by:

Using your horn to encourage other drivers to move out of your lane.
Only driving slower than the posted speed limit.
Watching the road ahead while driving.
Pulling off the road and waiting when there is high traffic.

During a trip, which shut-off valves should be open?

All shut-off valves should be open.
The rear shut-off valves should be open.
All shut-off valves should be in the open position, except the rear shut-off valves.
No shut-off valves should be open.

If a load is placed on one side of a trailer, the trailer:

May lean, and could result in a rollover.
May add extra support during turns.
Have improved braking.
Have improved steering.
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