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Question 1

Heat exchangers for cooling air or gas discharged from compressors. They
provide the most effective means of removing moisture from compressed air and gases.

Answer 1

Aftercooler

Question 2

Are machines cooled by atmospheric air circulated around the
cylinders or casings.

Answer 2

Air-Cooled Compressors

Question 3

A device that removes moisture from compressed air. Typically accomplished by
cooling the air through a refrigerator or desiccant bed.

Answer 3

Air Dryer

Question 4

automatic control instrumentation designed to prevent compressors from
operating at or near pressure and flow conditions that result in surge.

Answer 4

Anti-surge

Question 5

A metallic structure on which a compressor or other machine is mounted.

Answer 5

Base Plate

Question 6

The actual power input required by a compressor.

Answer 6

Brake Power

Question 7

a hand-held or foot-controlled flexible bag that produces a concentrated blast of air
ideal for achieving higher temperature in furnaces.

Answer 7

Bellows

Question 8

The pressure containing stationary element that encloses the rotor and associated
internal components of a compressor. Includes integral inlet and discharge corrections
(nozzles).

Answer 8

Casing

Question 9

A valve that permits flow in one direction only.

Answer 9

Check valve

Question 10

The maximum cylinder volume on a working side of the piston minus the piston
displacement volume per stroke. It is usually expressed as a percentage of the displaced
volume.

Answer 10

Clearance

Question 11

A specific type of filter that not only works to remove dust and particulates
from the air, but also oil from the air lines.

Answer 11

Coalescing filter

Question 12

The full rated volume flow of gas compressed and delivered by the
compressor at conditions prevailing at the compressor inlet. It sometimes means actual flow
rate expressed in ft3/min or m3/min.

Answer 12

Compressor Capacity

Question 13

The part of a reciprocating compressor that connects the piston to the
crankshaft.

Answer 13

Connecting Rod

Question 14

The part of a reciprocating compressor that encloses the piston.

Answer 14

Cylinder

Question 15

A device that promotes separation of liquids from gases.

Answer 15

Demister

Question 16

A material having a large proportion of surface pores, capable of attracting and
removing water vapor from the air.

Answer 16

Desiccant

Question 17

Dries the air in the compressor tank, reducing the amount of moisture collected

Answer 17

Dryer

Question 18

A stationary passage surrounding an impeller, in which velocity pressure imparted
to the flowing medium by the impeller is converted into static pressure.

Answer 18

Diffuser

Question 19

Air pressure produced at the discharge flange of the compressor.

Answer 19

Discharge Pressure

Question 20

The temperature at the discharge flange of the compressor.

Answer 20

Discharge Temperature

Question 21

A ______ works to remove excess liquid from the compressor. These include
manual, float and electronic types of drain valves.

Answer 21

Drain Valve

Question 22

an easy-to-replace, low-leakage type of seal consisting of a series of carbon
rings that can be arranged with a buffer gas to prevent the process gas from escaping.

Answer 22

Dry carbon ring

Question 23

Any reference to efficiency of a dynamic type compressor must be accompanied
by a qualifying statement which identifies the efficiency under consideration, as in the
following definitions.

Answer 23

Efficiency

Question 24

are devices for separating and removing dust and dirt from air before it enters a
compress.
Cmp – 1

Answer 24

Filters

Question 25

The ______ (inlet or discharge) is a means of connecting the casing to the inlet or discharge piping by means of bolted rims (flanges).

Answer 25

Flange Connection

Question 26

Air at atmospheric conditions at any specific location. Because the altitude, barometer, and temperature may vary at different localities and at different times, it follows that this term does not mean air under identical or standard conditions.

Answer 26

Free Air

Question 27

The pressure determined by most instruments and gauges, usually expressed in bars.

Answer 27

Gauge Pressure

Question 28

The part of a dynamic compressor that impacts energy to the flowing medium by means of centrifugal force. It consists of a number of blades mounted so as to rotate with the shaft.

Answer 28

Impeller

Question 29

A pressure volume diagram for a compressor or engine cylinder produced by direct measurement made by the use of a device called an indicator.

Answer 29

Indicator Card

Question 30

Heat exchangers for removing the heat of compression between stages of a compressor. They usually condense and remove a considerable amount of moisture as well.

Answer 30

Intercoolers

Question 31

The removal of heat from the air or gas between stages or stage groups.

Answer 31

31. Intercooling -

Question 32

a shaft seal designed to restrict flow by requiring the fluid to pass through a series of ridges and intricate paths.

Answer 32

Labyrinth Seal

Question 33

a close fitting bushing in which oil and water are injected in order to seal the process from the atmosphere.

Answer 33

Liquid Buffered Seal

Question 34

a system that circulates and cools sealing and lubricating oils.

Answer 34

Lubrication System

Question 34

a rotary compressor that uses an impeller with vanes to transmit centrifugal force into a sealing fluid, such as water, driving it against the wall of a cylindrical casing.

Answer 34

Liquid Ring Compressor

Question 35

The total pressure measured from absolute zero, (i.e., from an absolute vacuum).

Answer 35

Absolute Pressure

Question 36

The limiting value of saturation pressure as the saturation temperature approaches the critical temperature.

Answer 36

Critical Pressure

Question 37

Loss of pressure in a compressed air system or component due to friction or restriction.

Answer 37

Pressure Drop

Question 38

The total absolute pressure at the inlet flange of a compressor.

Answer 38

Intake Pressure

Question 39

the pressure point setting where the pressure switch stops the compressor from increasing the pressure in the tank above this point, also referred to as cut- out pressure.

Answer 39

Kick-out Pressure

Question 40

the pressure point setting where the pressure switch starts the compressor once the pressure in the tank goes below this point, also referred to as cut-in pressure.

Answer 40

Kick-in Pressure

Question 41

The gas tight disc inside the cylinder of a reciprocating compressor responsible for gas compression.

Answer 41

Piston

Question 42

the difference between cut-in and cut-out pressure.

Answer 42

Pressure Band or Pressure Differential

Question 43

The difference between the discharge pressure and the intake pressure.

Answer 43

Pressure Rise

Question 44

The pressure measured in a flowing stream (liquid or gas) in such a manner that no effect on the measurement is produced by the velocity of the stream.

Answer 44

Static Pressure

Question 45

a device that turns on or shuts off the electric motor running the compressor. It is designed to react on the cut –out and cut-in pressure settings of the system.

Answer 45

Pressure Switch

Question 46

The elimination of undesired gas or liquid from a system.

Answer 46

Purging

Question 47

devices designed to prevent the process gas from leaking from the compressor shaft.

Answer 47

Seal System

Question 48

a device used to physically separate two or more components from a mixture.

Answer 48

Separator

Question 49

device designed to compress the gas a single time before discharging the gas.

Answer 49

Single-stage Compressor

Question 50

is the measure of the fluid slip in the impeller of a centrifugal compressor.

Answer 50

Slip Factor

Question 51

the fixed blades that are mounted equally along the casing of an axial flow compressor.

Answer 51

Stator Blades

Question 52

the intermittent flow of pressure through a compressor that occurs when the discharge pressure is too high, resulting in flow reversal within a compressor.

Answer 52

Surging

Question 53

The power required to compress a gas adiabatically without any provision for lost energy.

Answer 53

Theoretical Power

Question 54

A compressor that operates with an intake pressure below atmospheric pressure.

Answer 54

Vacuum Pump

Question 55

Devices with passages for directing flow into alternate paths or to prevent flow.

Answer 55

Valves

Question 56

The ratio of the actual quantity of air delivered to the actual capacity of the compressor.

Answer 56

Volumetric Efficiency

Question 57

The curved funnel that increases in area as it approaches the discharge port of the compressor. The divergent shape of the volute converts the velocity of the gas into static pressure.

Answer 57

Volute or Scroll Casing

Question 58

These are machines cooled by water circulated through jackets surrounding the cylinders or casings.

Answer 58

Water-Cooled Compressors