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FDNY A-35 EXAM QUESTIONS &
ANSWERS
Question 1: Air compressors power...
CORRECT ANSWER: (1) industrial equipment and (2)
construction tools
Question 2: Examples of equipment powered by air
compressor
CORRECT ANSWER: pneumatic wrenches, lifts in auto
service stations, paint spray booths
Question 3: Air compressors enable...
CORRECT ANSWER: (1) efficient repair of all types of
vehicles; and (2) facilitate their safe operation on public thoroughfares
Question 4: Permit is required for air compressor
CORRECT ANSWER: that compresses air above 100 PSI
Question 5: Types of air compressors
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CORRECT ANSWER: (1) reciprocating; (2) centrifugal;
(3) solar; and (4) rotary
Question 6: Difference in types of air compressors
CORRECT ANSWER: The difference is the way in
which they compress air
Question 7: How do air compressors work
CORRECT ANSWER: take the air in a room and force it
into a container UNDER PRESSURE. The more air forced into the container, the greater the pressure.Compressed air can be discharged from the container at a controlled rate.
Question 8: Most common air compressor
CORRECT ANSWER: Reciprocating
Question 9: Air compressors are sometimes called
CORRECT ANSWER: air pumps
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Question 10: Air compressors can be powered by:
CORRECT ANSWER: (1) electric motors; (2) internal
combustion engines; or (3) steam turbines
Question 11: Explosions & air compressors
CORRECT ANSWER: If there is a build up of flammable
gases (ex: in service stations and workshops), those gases
are heavier than air and fall to the floor before spreading outward. These gases are easily ignited by sparks and high temperatures--which INCLUDES the heat generated by an air compressor.
Question 12: To avoid explosions with air compressors
CORRECT ANSWER: Raise air compressor at LEAST 5
feet above ground level so that no flammable gases are drawn into the compressor. To meet the height requirement you can place compressor on a shelf or bench OR the air receiver tank may be turned and stood on end with the air compressor bolted to the top of the tank.
Question 13: Power to air compressor
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CORRECT ANSWER: entire unit is driven by an electric
motor. Motor activates a series of drive belts. Belts power the moving parts of the unit--like with power steering and alternator in automobile
Question 14: Compression Chamber operation
CORRECT ANSWER: Air is compressed in compression
chamber which consists of a PISTON inside a CYLINDER. Piston moves up and down. When piston moves down --> draws air into cylinder, through INTAKE VALVE (valve automatically opens when piston moves down). When piston moves up --> air is compressed (intake valve automatically closes to avoid air escaping from cylinder).
Question 15: Air Receiver Operation
CORRECT ANSWER: When air pressure reaches a
certain level, it forces open a DISCHARGE VALVE (which is spring loaded). This releases compressed air into air receiver (aka air tank), which is what supplies compressed air when needed.