2026 Minnesota DMV Air Brakes Class A Test 1 (25 Questions And Complete Answers)
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Terms in this set
25
At what psi is the safety valve set to open?
1. 100 psi
2. 150 psi
3. 200 psi
4. 500 psi
1. 100 psi
2. 150 psi
3. 200 psi
4. 500 psi
150 psi
While inspecting a coupling, you should go under the trailer and:
1. Detach the jaws from around the kingpin.
2. Make sure the locking lever is in the "emergency" position.
3. Remove the safety latch.
4. Look into the back of the fifth wheel.
1. Detach the jaws from around the kingpin.
2. Make sure the locking lever is in the "emergency" position.
3. Remove the safety latch.
4. Look into the back of the fifth wheel.
Look into the back of the fifth wheel.
What is a bobtail?
1. A tractor without a semi-trailer
2. A tractor with two semi-trailers
3. A tractor that goes faster than the speed limit
4. A tractor that goes slower than the speed limit
1. A tractor without a semi-trailer
2. A tractor with two semi-trailers
3. A tractor that goes faster than the speed limit
4. A tractor that goes slower than the speed limit
A tractor without a semi-trailer
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.
When you press the brake pedal in a vehicle with S-cam brakes, air pressure pushes out the rod and moves the:
1. Slack adjuster.
2. Axle
3. Brake drum.
4. Alcohol evaporator.
1. Slack adjuster.
2. Axle
3. Brake drum.
4. Alcohol evaporator.
Slack adjuster.
Maintain a following distance of at least ____ for every 10 feet of your vehicle if you are traveling at a speed under 40 mph.
1. One second
2. Two seconds
3. Three seconds
1. One second
2. Two seconds
3. Three seconds
One second
If colors are being used to distinguish glad hands, which color is used for emergency lines?
1. Orange
2. Yellow
3. Blue
4. Red
1. Orange
2. Yellow
3. Blue
4. Red
Red
Which type of vehicle is most prone to the “crack-the-whip” effect?
1. A five-axle tractor semi-trailer
2. A three-axle tractor semi-trailer
3. A bobtail tractor
4. A triple trailer
1. A five-axle tractor semi-trailer
2. A three-axle tractor semi-trailer
3. A bobtail tractor
4. A triple trailer
A triple trailer
Air brakes use ____ to function.
1. Compressed air
2. Liquid nitrogen
3. Carbon dioxide
1. Compressed air
2. Liquid nitrogen
3. Carbon dioxide
Compressed air
If the low pressure warning signal activates while you are driving, you should:
1. Continue driving normally.
2. Exit the road and park as soon as safely possible.
3. Stop where you are and park.
4. Put on your hazard lights and continue driving.
1. Continue driving normally.
2. Exit the road and park as soon as safely possible.
3. Stop where you are and park.
4. Put on your hazard lights and continue driving.
Exit the road and park as soon as safely possible.
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