2026 Hawaii DMV Combination Class A Test 1 (20 Questions And Complete Answers)
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Shut-off valves:
1. Prevent air from escaping air brake systems.
2. Prevent air from entering air brake systems.
3. Override vehicles that are out of control.
1. Prevent air from escaping air brake systems.
2. Prevent air from entering air brake systems.
3. Override vehicles that are out of control.
Prevent air from escaping air brake systems.
The ____ trailer is the most likely to turn over if a driver takes a turn too quickly.
1. Front
2. Last
3. Middle
1. Front
2. Last
3. Middle
Last
When connecting a converter dolly to a second trailer, the trailer height should be ____ the center of the fifth wheel.
1. Level with
2. Slightly higher than
3. Slightly lower than
1. Level with
2. Slightly higher than
3. Slightly lower than
Slightly lower than
If the emergency air line loses pressure:
1. The Anti-Lock Braking System will activate.
2. The service air line will activate.
3. The emergency brakes will activate.
1. The Anti-Lock Braking System will activate.
2. The service air line will activate.
3. The emergency brakes will activate.
The emergency brakes will activate.
If a trailer begins to jackknife, the driver:
1. Should not apply the trailer hand brake.
2. Should firmly apply the brakes.
3. Can straighten the trailer with the parking brake.
1. Should not apply the trailer hand brake.
2. Should firmly apply the brakes.
3. Can straighten the trailer with the parking brake.
Should not apply the trailer hand brake.
A trolley valve:
1. Should be used while driving.
2. Should only be used to test trailer brakes.
3. Should be used when parking uphill.
1. Should be used while driving.
2. Should only be used to test trailer brakes.
3. Should be used when parking uphill.
Should only be used to test trailer brakes.
When braking with ABS, you should:
1. Push the brake pedal harder than usual.
2. Push the brake pedal as you normally would.
3. Push the brake pedal more lightly than usual.
1. Push the brake pedal harder than usual.
2. Push the brake pedal as you normally would.
3. Push the brake pedal more lightly than usual.
Push the brake pedal as you normally would.
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.
The trailer hand valve should not be used while you are driving because:
1. It will disconnect from the vehicle.
2. You will stop the vehicle too quickly.
3. It can cause a skid.
1. It will disconnect from the vehicle.
2. You will stop the vehicle too quickly.
3. It can cause a skid.
It can cause a skid.
Keeping cargo low can:
1. Prevent a rollover.
2. Help you drive faster.
3. Make turns more dangerous.
1. Prevent a rollover.
2. Help you drive faster.
3. Make turns more dangerous.
Prevent a rollover.
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