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Idaho 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 Idaho Commercial Driver's 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.
You have made error so far
Passing grade —
4 or fewer errors
During a trip, landing gear should be:
Completely raised.
Completely lowered.
Skimming the pavement.
The emergency air line supplies air to the:
Relay valves.
Trailer air tanks.
Signal line.
Before beginning a trip, you should:
Leave the service line valve open.
Remove the relay valves.
Close the emergency line valve.
When backing up while coupling a trailer, the tractor should be positioned:
Directly in front of the trailer.
Directly next to the trailer.
Parallel with the trailer.
A driver should test the tractor protection valve by:
Pulling the yellow, diamond-shaped knob.
Releasing air with the brake pedal.
Unlocking the trailer doors.
If unsure if a trailer has an Anti-Lock Braking System (ABS), you can:
Look under the trailer for wheel speed sensors coming from the back of the brakes.
Remove a tire and look for the ABS sensor on the axle.
Assume it does have ABS.
What does an Anti-Lock Braking System (ABS) do?
It allows a vehicle's wheels to lock up.
It prevents a vehicle's wheels from locking up.
It makes turning a vehicle easier.
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