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Massachusetts 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 Commercial Driver 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.
You have made error so far
Passing grade —
5 or fewer errors
When using the controlled braking method in an emergency situation, you should:
Apply the brakes as hard as possible without locking the wheels.
Apply the brakes with about half of your usual force.
Apply the brakes so the wheels lock.
Apply the brakes with minimal pressure.
Failing to drain the tanks in an air brake system can result in:
Water freezing and causing brake failure.
Squishy brakes.
Too much air collecting.
Too much fuel being carried.
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.
The air entering air storage tanks may contain:
Water and compressor oil.
Air brakes are:
An effective tool for stopping large vehicles.
Prohibited on large vehicles.
Only effective in poor weather.
A tool to improve fuel efficiency.
What can happen if parking brakes are used in very wet weather with temperatures below freezing?
The brakes will squeak.
The brakes may freeze so the vehicle cannot move.
The brakes may suddenly release by themselves.
The brakes may become too smooth to be used.
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