2026 Maryland DMV Combination Class A Test 1 (20 Questions And Complete Answers)
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The service air line is attached to the:
1. Relay valves.
2. Supply line.
3. Steering wheel.
4. Emergency air line.
1. Relay valves.
2. Supply line.
3. Steering wheel.
4. Emergency air line.
Relay valves.
Before a drive, ensure that air flows to all trailers by:'
1. Opening the rear shut-off valves and listening for escaping air.
2. Closing the rear shut-off valves and listening for escaping air.
3. Disconnecting air supply lines and listening for escaping air.
4. Rolling each trailer down a hill and testing the brakes.
1. Opening the rear shut-off valves and listening for escaping air.
2. Closing the rear shut-off valves and listening for escaping air.
3. Disconnecting air supply lines and listening for escaping air.
4. Rolling each trailer down a hill and testing the brakes.
Opening the rear shut-off valves and listening for escaping air.
If color-coded, which color is used to identify emergency, or supply, lines?
1. White
2. Yellow
3. Red
1. White
2. Yellow
3. Red
Red
The tractor protection valve:
1. Ensures that oil adequately lubricates the engine.
2. Protects the tractor from exceeding a set speed.
3. Keeps air in the truck braking system if the trailer develops a leak.
1. Ensures that oil adequately lubricates the engine.
2. Protects the tractor from exceeding a set speed.
3. Keeps air in the truck braking system if the trailer develops a leak.
Keeps air in the truck braking system if the trailer develops a leak.
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.
When traveling more slowly than 40 mph, maintain at least ____ of following distance per every 10 feet of your vehicle.
1. One second
2. Two seconds
3. Three seconds
4. Four seconds
1. One second
2. Two seconds
3. Three seconds
4. Four seconds
One second
Emergency air lines are often coded with the color:
1. Green.
2. Orange.
3. Yellow.
4. Red.
1. Green.
2. Orange.
3. Yellow.
4. Red.
Red.
To help prevent rollovers, you should:
1. Accelerate quickly after stopping.
2. Drive slowly around turns.
3. Keep the load near the back of the trailer.
4. Keep the load on one side of the trailer.
1. Accelerate quickly after stopping.
2. Drive slowly around turns.
3. Keep the load near the back of the trailer.
4. Keep the load on one side of the trailer.
Drive slowly around turns.
Trailers with low underneath clearance may be difficult to drive:
1. On interstate highways.
2. Over railroad crossings.
3. On dirt roads.
4. At the posted speed limit.
1. On interstate highways.
2. Over railroad crossings.
3. On dirt roads.
4. At the posted speed limit.
Over railroad crossings.
A loss of air pressure in the emergency line will cause:
1. The service brakes to activate.
2. The tractor protection valve to close.
3. The rear trailer to detach from the combination.
4. The suspension springs to extend.
1. The service brakes to activate.
2. The tractor protection valve to close.
3. The rear trailer to detach from the combination.
4. The suspension springs to extend.
The tractor protection valve to close.
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