FDNY A35 Exam - Questions With Complete Solutions
How does the air compressor operate? Right Ans - Motor activates drive
belts then belts serve power to moving parts of unit.
What happens in the compression chamber? Right Ans - There is a piston
in a cylinder. The piston moves up and down and when it moves down it
draws in air through intake valve. Intake valve closes when it is up and
prevents air from escaping the cylinder which compresses the air.
Different types of air compressors Right Ans - Reciprocating, centrifugal,
rotary, and scroll. Most common is reciprocating. Difference is the way in
which they compress the air.
How can air compressors be powered? Right Ans - Electric motor (most
common), internal combustion engines, or steam turbines.
When is an FDNY permit required for a compressor? Right Ans - If it is used
to compress any nonflammable, corrosive or oxidizing gas including air to a
pressure exceeding 100 psi. Includes a fair or festival.
When is a permit not required? Who issues this permit? Right Ans -
Outdoor air compressing. Bureau of fire prevention.
Flammable gases Right Ans - Heavier than air and falls to the floor and
spreads outward. Easily ignited by sparks and high temps. If inside
compressor can cause explosion.
How far must air compressor be from ground to avoid flammable gases?
Where? Right Ans - 5 feet on a shelf or bench or on top of the air receiver
tank.
What does the discharge valve do? Right Ans - Opens when pressure
reaches a certain level and is spring loaded. When it opens the compressed air
is released into air receiver sometimes called air tank.
Difference between single and multi stage compressors? Right Ans - Multi
stage have levels of pressure separated by an intercooler that cools the air as
it travels.
How does the air compressor operate? Right Ans - Motor activates drive
belts then belts serve power to moving parts of unit.
What happens in the compression chamber? Right Ans - There is a piston
in a cylinder. The piston moves up and down and when it moves down it
draws in air through intake valve. Intake valve closes when it is up and
prevents air from escaping the cylinder which compresses the air.
Different types of air compressors Right Ans - Reciprocating, centrifugal,
rotary, and scroll. Most common is reciprocating. Difference is the way in
which they compress the air.
How can air compressors be powered? Right Ans - Electric motor (most
common), internal combustion engines, or steam turbines.
When is an FDNY permit required for a compressor? Right Ans - If it is used
to compress any nonflammable, corrosive or oxidizing gas including air to a
pressure exceeding 100 psi. Includes a fair or festival.
When is a permit not required? Who issues this permit? Right Ans -
Outdoor air compressing. Bureau of fire prevention.
Flammable gases Right Ans - Heavier than air and falls to the floor and
spreads outward. Easily ignited by sparks and high temps. If inside
compressor can cause explosion.
How far must air compressor be from ground to avoid flammable gases?
Where? Right Ans - 5 feet on a shelf or bench or on top of the air receiver
tank.
What does the discharge valve do? Right Ans - Opens when pressure
reaches a certain level and is spring loaded. When it opens the compressed air
is released into air receiver sometimes called air tank.
Difference between single and multi stage compressors? Right Ans - Multi
stage have levels of pressure separated by an intercooler that cools the air as
it travels.
