2026 Iowa DMV Combination Class A Test 2 (20 Questions And Complete Answers)
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Before a trip, you can make sure air flows to all trailers by:
1. Checking for moving air inside of each trailer.
2. Listening for air at the rear shut-off valve.
3. Feeling for air at the front shut-off valve.
1. Checking for moving air inside of each trailer.
2. Listening for air at the rear shut-off valve.
3. Feeling for air at the front shut-off valve.
Listening for air at the rear shut-off valve.
In a vehicle equipped with an automatic tractor protection valve, the valve will pop out when air pressure drops to a level between:
1. 20 and 45 psi.
2. 75 and 105 psi.
3. 50 and 65 psi.
1. 20 and 45 psi.
2. 75 and 105 psi.
3. 50 and 65 psi.
20 and 45 psi.
When backing up your tractor while coupling it to a trailer, the trailer brakes should be:
1. Deactivated.
2. Locked.
3. Unlocked.
1. Deactivated.
2. Locked.
3. Unlocked.
Locked.
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.
When coupling a trailer:
1. Make sure to couple the proper glad hands.
2. Glad hands can be connected to any other glad hands.
3. Only one set of glad hands should be connected.
1. Make sure to couple the proper glad hands.
2. Glad hands can be connected to any other glad hands.
3. Only one set of glad hands should be connected.
Make sure to couple the proper glad hands.
What is the tractor protection valve?
1. A valve that keeps air in the brake system should a bad leak occur
2. A valve that prevents the trailer from being accidentally released
3. A valve that prevents the vehicle from going too fast
1. A valve that keeps air in the brake system should a bad leak occur
2. A valve that prevents the trailer from being accidentally released
3. A valve that prevents the vehicle from going too fast
A valve that keeps air in the brake system should a bad leak occur
To prevent a rollover, cargo should be:
1. Loaded with most weight on the driver’s side of the trailer.
2. Placed near the rear of the trailer.
3. Spread out in the trailer.
1. Loaded with most weight on the driver’s side of the trailer.
2. Placed near the rear of the trailer.
3. Spread out in the trailer.
Spread out in the trailer.
When braking while pulling a trailer equipped with anti-lock brakes, you should:
1. Pump the brakes.
2. Use extra braking force to ensure the brakes kick in.
3. Brake as you would without anti-lock brakes.
1. Pump the brakes.
2. Use extra braking force to ensure the brakes kick in.
3. Brake as you would without anti-lock brakes.
Brake as you would without anti-lock brakes.
When coupling:
1. You can assume all vehicles are the same.
2. Be sure that you are coupling correctly.
3. Cracks in the mounting are acceptable.
1. You can assume all vehicles are the same.
2. Be sure that you are coupling correctly.
3. Cracks in the mounting are acceptable.
Be sure that you are coupling correctly.
A combination vehicle has ____ air line(s).
1. One
2. Two
3. Three
1. One
2. Two
3. Three
Two
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