2026 Missouri DMV Combination Class A Test 1 (20 Questions And Complete Answers)
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Older trailers are not equipped with spring brakes. This means that if the air supply for a vehicle's air braking system leaks away:
1. The trailer will stop normally.
2. The trailer will not have brakes.
3. The trailer will speed up.
1. The trailer will stop normally.
2. The trailer will not have brakes.
3. The trailer will speed up.
The trailer will not have brakes.
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.
The service air line is often controlled by the foot brake and is attached to the ____ valves.
1. Relay
2. Supply
3. Emergency
1. Relay
2. Supply
3. Emergency
Relay
In an empty combination vehicle, the stiff suspension springs and strong brakes will have:
1. High traction.
2. Low traction.
3. No traction.
1. High traction.
2. Low traction.
3. No traction.
Low traction.
When coupling, after you've connected the air lines to the trailer, you should:
1. Supply air to the trailer.
2. Activate the emergency brake.
3. Disconnect the glad hands.
1. Supply air to the trailer.
2. Activate the emergency brake.
3. Disconnect the glad hands.
Supply air to the trailer.
Fully-loaded rigs:
1. Usually are very responsive to steering.
2. Are more likely to roll over than empty rigs.
3. Can stop quickly.
1. Usually are very responsive to steering.
2. Are more likely to roll over than empty rigs.
3. Can stop quickly.
Are more likely to roll over than empty rigs.
Operating combination vehicles usually requires ____ operating single vehicles.
1. Less skill than
2. About the same level of skill as
3. More skill than
1. Less skill than
2. About the same level of skill as
3. More skill than
More skill than
What is a bobtail tractor?
1. A tractor without a trailer
2. A tractor attached to two trailers
3. A tractor with a tank
1. A tractor without a trailer
2. A tractor attached to two trailers
3. A tractor with a tank
A tractor without a trailer
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.
If a parked trailer does not have spring brakes, you should keep the trailer from moving by:
1. Having the vehicle parked against a wall or other vehicle.
2. Using chock blocks.
3. Parking on a slight incline.
1. Having the vehicle parked against a wall or other vehicle.
2. Using chock blocks.
3. Parking on a slight incline.
Using chock blocks.
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