2026 Idaho DMV Combination Class B Test 1 (20 Questions And Complete Answers)
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The emergency air line supplies air to the:
1. Relay valves.
2. Trailer air tanks.
3. Signal line.
1. Relay valves.
2. Trailer air tanks.
3. Signal line.
Signal line.
Before beginning a trip, you should:
1. Leave the service line valve open.
2. Remove the relay valves.
3. Close the emergency line valve.
1. Leave the service line valve open.
2. Remove the relay valves.
3. Close the emergency line valve.
Close the emergency line valve.
When backing up while coupling a trailer, the tractor should be positioned:
1. Directly in front of the trailer.
2. Directly next to the trailer.
3. Parallel with the trailer.
1. Directly in front of the trailer.
2. Directly next to the trailer.
3. Parallel with the trailer.
Directly in front of the trailer.
During a trip, landing gear should be:
1. Completely raised.
2. Completely lowered.
3. Skimming the pavement.
1. Completely raised.
2. Completely lowered.
3. Skimming the pavement.
Completely raised.
A driver should test the tractor protection valve by:
1. Pulling the yellow, diamond-shaped knob.
2. Releasing air with the brake pedal.
3. Unlocking the trailer doors.
1. Pulling the yellow, diamond-shaped knob.
2. Releasing air with the brake pedal.
3. Unlocking the trailer doors.
Releasing air with the brake pedal.
What does an Anti-Lock Braking System (ABS) do?
1. It allows a vehicle's wheels to lock up.
2. It prevents a vehicle's wheels from locking up.
3. It makes turning a vehicle easier.
1. It allows a vehicle's wheels to lock up.
2. It prevents a vehicle's wheels from locking up.
3. It makes turning a vehicle easier.
It prevents a vehicle's wheels from locking up.
If unsure if a trailer has an Anti-Lock Braking System (ABS), you can:
1. Look under the trailer for wheel speed sensors coming from the back of the brakes.
2. Remove a tire and look for the ABS sensor on the axle.
3. Assume it does have ABS.
1. Look under the trailer for wheel speed sensors coming from the back of the brakes.
2. Remove a tire and look for the ABS sensor on the axle.
3. Assume it does have ABS.
Look under the trailer for wheel speed sensors coming from the back of the brakes.
Rollovers happen when:
1. Drivers turn too quickly.
2. Drivers turn too slowly.
3. It is raining.
1. Drivers turn too quickly.
2. Drivers turn too slowly.
3. It is raining.
Drivers turn too quickly.
If you are backing and the trailer begins to drift off-course, the driver should:
1. Return the steering wheel to the 12 o’clock position.
2. Turn the top of the steering wheel in the direction of the drift.
3. Turn the top of the steering wheel in the direction opposite of the drift.
1. Return the steering wheel to the 12 o’clock position.
2. Turn the top of the steering wheel in the direction of the drift.
3. Turn the top of the steering wheel in the direction opposite of the drift.
Turn the top of the steering wheel in the direction of the drift.
Combination vehicles are usually:
1. Easier to drive than single commercial vehicles.
2. Lighter than single commercial vehicles.
3. More difficult to drive than single commercial vehicles.
1. Easier to drive than single commercial vehicles.
2. Lighter than single commercial vehicles.
3. More difficult to drive than single commercial vehicles.
More difficult to drive than single commercial vehicles.
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