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West Virginia CDL Permit Test - Air Brakes

Number of questions: 25
Passing score: 20
Directions: This endorsement is required for driving a vehicle with air brakes. To receive this endorsement, applicants must pass a written test. The test consists of 25 multiple choice questions. Each question has four answer choices. To pass, the applicant must answer at least 20 questions correctly. Test questions come from the West Virginia Commercial Driver’s License Manual. Questions come from the chapter covering: Air Brakes. The Air Brakes endorsement may be used with the Class A, B or C CDL.
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1.
To use the stab braking method in an emergency situation, you should:
Apply the brakes completely until the wheels lock up, release the brakes until the wheels start rolling, then repeat the process.
Apply the brakes about halfway, but keep the wheels rolling.
Fully apply the brakes, let the wheels lock up, and hold the brake pedal down, keeping the wheels locked until the vehicle stops.
Apply the emergency brake.
2.
During a static leakage test, the maximum leakage rate for a double combination vehicle is:
3 psi in one minute.
6 psi in one minute.
8 psi in one minute.
4 psi in one minute.
3.
When you need to stop in an emergency, you should:
Lock the wheels and skid to a stop.
Stop in a way that keeps your vehicle in a straight line.
Stop in a way that turns your vehicle.
Expect your vehicle to slow down more quickly than usual.
4.
A low air pressure warning signal should activate:
When tank pressure falls below 120 psi.
When tank pressure falls below 60 psi.
When tank pressure falls below 10 psi.
5.
To use the controlled braking method, you should:
Apply the brakes as hard as possible without locking the wheels.
Apply the brakes with about half-force.
Apply the brakes until the wheels lock.
Pump the brakes.
6.
Air tanks usually hold enough compressed air:
For one stop before needing to be refilled.
For several stops before needing to be refilled.
For a day’s worth of braking.
For an unlimited number of stops.
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