2026 Missouri DMV Air Brakes Class A Test 1 (25 Questions And Complete Answers)
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Terms in this set
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A safety valve is set to open at ____ pounds per square inch (psi).
1. 100
2. 150
3. 200
1. 100
2. 150
3. 200
150
In a dual air brake system, air pressure should build from 85 to 100 psi within ____ seconds.
1. 25
2. 10
3. 45
1. 25
2. 10
3. 45
45
A dual air brake system:
1. Consists of two separate air brake systems that share a single set of controls.
2. Is a single air brake system with two different sets of controls.
3. Consists of one air brake system for the left side of the truck and one system for the right side of the truck, each with its own set of controls.
1. Consists of two separate air brake systems that share a single set of controls.
2. Is a single air brake system with two different sets of controls.
3. Consists of one air brake system for the left side of the truck and one system for the right side of the truck, each with its own set of controls.
Consists of two separate air brake systems that share a single set of controls.
An alcohol evaporator in an air brake system:
1. Makes the brakes work without squeaking.
2. Prevents ice from forming in the braking system.
3. Lubricates parts of the braking system.
1. Makes the brakes work without squeaking.
2. Prevents ice from forming in the braking system.
3. Lubricates parts of the braking system.
Prevents ice from forming in the braking system.
While driving, ____ generally holds spring brakes in place.
1. Air pressure
2. Electricity
3. Gasoline
1. Air pressure
2. Electricity
3. Gasoline
Air pressure
What helps prevent wheel lockup when braking?
1. An Anti-Lock Braking System (ABS)
2. Air brakes
3. An alternator
1. An Anti-Lock Braking System (ABS)
2. Air brakes
3. An alternator
An Anti-Lock Braking System (ABS)
Which of the following is not part of a vehicle’s air brake system?
1. Air gauges
2. Low pressure warning device
3. Air filter
1. Air gauges
2. Low pressure warning device
3. Air filter
Air filter
The air storage tanks:
1. Hold only enough air for one braking cycle.
2. Hold enough air for the brakes to be used several times if the compressor stops working.
3. Do not hold air unless there is an emergency.
1. Hold only enough air for one braking cycle.
2. Hold enough air for the brakes to be used several times if the compressor stops working.
3. Do not hold air unless there is an emergency.
Hold enough air for the brakes to be used several times if the compressor stops working.
The leakage rate for a single vehicle with air brakes should be no more than ____ in one minute during a static leakage test.
1. 1 psi
2. 2 psi
3. 3 psi
1. 1 psi
2. 2 psi
3. 3 psi
2 psi
During an applied leakage test, the maximum leakage rate for a triple combination vehicle is ____ in a minute.
1. 2 psi
2. 4 psi
3. 6 psi
1. 2 psi
2. 4 psi
3. 6 psi
6 psi
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