COMPRESSORS, FANS AND BLOWERS
TEST QUESTIONS WITH VERIFIED
ANSWERS
Multi-staging - Answer-is simply the compression of air or gas in two or more cylinders
in place of a single cylinder compressor. It is used in reciprocating compressors when
pressure of 300 kPa and above are desire, in order to:
✓ Save power
✓ Limit the gas discharge temperature
✓ Limit the pressure differential per cylinder
✓ Prevent vaporization of lubricating oil and to prevent its ignition if the temperature
becomes too high
intercooler - Answer-It is common practice for multi-staging to cool the air or gas
between stages of compression in an ___, and it is this cooling that affects considerable
saving power.
EQUIPMENT RELIABILITY - Answer-It is defined as the availability, maintainability, and
mean time between failures of the equipment during its operation.
Use of compressed air - Answer-✓ For filling the air in tube of vehicles ✓ In automobile
service station to clean vehicles
✓ For spray painting in paint industries
✓ In vehicle to operate air brakes
✓ For cleaning workshop machines
✓ For supercharging of an IC engines ✓ For operation of Pneumatic tools (i.e. rock
drills, vibrators etc.)
PROCESS - Answer-✓ Mass flow rate
✓ Absolute suction and discharge pressure and absolute temperature
✓ Gas physical properties (e.g. composition, molecular weight, ratio of specific heats,
compressibility)
✓ Effects of process gas on the compressor system (e.g., corrosion, erosion, fouling,
chemical reaction, coking, polymerization, temperature, condensation and liquid
removal)
✓ Machinery interaction with the process gas (e.g., lubricants, buffer fluids, seal media)
✓ Solubility of the compressed gas in the lubricant in flooded screw applications.
, ✓ Startup and shutdown process/mechanical conditions. These conditions can be very
different than normal operating conditions and may significantly influence the selection
process.
✓ Preferred and acceptable methods of capacity controls
SAFETY - Answer-✓ Limiting gas properties (e.g., decomposition, flammability, toxicity).
✓ Compatibility of process gas with materials of construction (e.g., H2S with copper,
ethylene oxide with brass, oxygen)
✓ Over-pressure protection ✓ Containment, collection and disposal of seal and vent
gases
ECONOMICS - Answer-✓ Life-cycle cost
✓ User and vendor capabilities and facilities for maintaining equipment.
✓ Level of sparing dictated by the production needs
✓ Standardization of equipment and lubricants
✓ Equipment life expectancy
SITE AND LOCATION - Answer-✓ Available utilities
✓ Accessibility to services and support
✓ Environmental conditions
PARTS OF A RECIPROCATING COMPRESSOR - Answer-❑ CASING
❑ DIAPHRAGM
❑ ROTOR ASSEMBLY
❑ SEALS
❑ CRANKCASE
❑ PISTON
❑ CYLINDER
❑ CRANKSHAFT
❑ CONNECTING ROD
❑ CROSSHEAD
❑ PISTON ROD
TYPES OF POSITIVE DISPLACEMENT COMPRESSORS - Answer-
types of compressor - Answer-POSITIVE DISPLACEMENT COMPRESSORS
DYNAMIC COMPRESSORS
TYPES OF DYNAMIC COMPRESSORS - Answer-CENTRIFUGAL COMPRESSOR
AXIAL COMPRESSOR
TEST QUESTIONS WITH VERIFIED
ANSWERS
Multi-staging - Answer-is simply the compression of air or gas in two or more cylinders
in place of a single cylinder compressor. It is used in reciprocating compressors when
pressure of 300 kPa and above are desire, in order to:
✓ Save power
✓ Limit the gas discharge temperature
✓ Limit the pressure differential per cylinder
✓ Prevent vaporization of lubricating oil and to prevent its ignition if the temperature
becomes too high
intercooler - Answer-It is common practice for multi-staging to cool the air or gas
between stages of compression in an ___, and it is this cooling that affects considerable
saving power.
EQUIPMENT RELIABILITY - Answer-It is defined as the availability, maintainability, and
mean time between failures of the equipment during its operation.
Use of compressed air - Answer-✓ For filling the air in tube of vehicles ✓ In automobile
service station to clean vehicles
✓ For spray painting in paint industries
✓ In vehicle to operate air brakes
✓ For cleaning workshop machines
✓ For supercharging of an IC engines ✓ For operation of Pneumatic tools (i.e. rock
drills, vibrators etc.)
PROCESS - Answer-✓ Mass flow rate
✓ Absolute suction and discharge pressure and absolute temperature
✓ Gas physical properties (e.g. composition, molecular weight, ratio of specific heats,
compressibility)
✓ Effects of process gas on the compressor system (e.g., corrosion, erosion, fouling,
chemical reaction, coking, polymerization, temperature, condensation and liquid
removal)
✓ Machinery interaction with the process gas (e.g., lubricants, buffer fluids, seal media)
✓ Solubility of the compressed gas in the lubricant in flooded screw applications.
, ✓ Startup and shutdown process/mechanical conditions. These conditions can be very
different than normal operating conditions and may significantly influence the selection
process.
✓ Preferred and acceptable methods of capacity controls
SAFETY - Answer-✓ Limiting gas properties (e.g., decomposition, flammability, toxicity).
✓ Compatibility of process gas with materials of construction (e.g., H2S with copper,
ethylene oxide with brass, oxygen)
✓ Over-pressure protection ✓ Containment, collection and disposal of seal and vent
gases
ECONOMICS - Answer-✓ Life-cycle cost
✓ User and vendor capabilities and facilities for maintaining equipment.
✓ Level of sparing dictated by the production needs
✓ Standardization of equipment and lubricants
✓ Equipment life expectancy
SITE AND LOCATION - Answer-✓ Available utilities
✓ Accessibility to services and support
✓ Environmental conditions
PARTS OF A RECIPROCATING COMPRESSOR - Answer-❑ CASING
❑ DIAPHRAGM
❑ ROTOR ASSEMBLY
❑ SEALS
❑ CRANKCASE
❑ PISTON
❑ CYLINDER
❑ CRANKSHAFT
❑ CONNECTING ROD
❑ CROSSHEAD
❑ PISTON ROD
TYPES OF POSITIVE DISPLACEMENT COMPRESSORS - Answer-
types of compressor - Answer-POSITIVE DISPLACEMENT COMPRESSORS
DYNAMIC COMPRESSORS
TYPES OF DYNAMIC COMPRESSORS - Answer-CENTRIFUGAL COMPRESSOR
AXIAL COMPRESSOR
