Basics of Air Compressors

The Centrifugal air compressor ___.

• Has valves that open and close at the proper time

• Uses a series of rotors equipped with blades

• Is only made in a single stage design

• Uses an impeller to impart radial momentum to the air

The ___ of an air compressor is the volume of free air per minute that the compressor will supply at a given pressure.

• Drive power

• Maximum pressure

• Capacity

• Flow factor

The reciprocating piston air compressor ___.

• Has valves that open and close at the proper time

• Is similar to a turbine found in a jet aircraft

• Is seldom used because of limited applications

• Is only used in large manufacturing plants

The air compressor ___ switch is used to start and stop the air compressor’s motor.

• Pressure

• Vacuum

• Reed

• Proximity

Most air compressed air safety relief valves are ___.

• Adjustable by the machine operator

• Sealed with a lead seal

• Permanently sealed shut

• Left open

A positive displacement air compressor ___.

• Recompresses the same volume of air twice

• Produces a new volume of air for every stroke

• Compresses the air by increasing the velocity of the air

• Is best suited for high flow rate applications

The ___ pressure is the setting at which the air compressor is turned off.

• Cut-in

• Cut-out

• Max pressure

• Safety pressure

In a reciprocating piston air compressor ___.

• Both valves are never closed

• Both valves are never open

• The intake valve is open as the piston moves down

• The intake valve is open as the piston moves up

One instrument that is not used to measure compressor flow rate is a ___.

• Flat plate orifice

• Flow nozzle

• Venturi

• Pitot tube

The ideal gas law requires that temperature be stated ___.

• In absolute units

• In Celsius or Fahrenheit

• In relative units

• Degrees above freezing