Remove impurities from air
Reduce volume of air
Cause moisture and oil vapour to drop out
Cool the air
C. Cause moisture and oil vapour to drop out
Increases
Decreases
Remains same
Increases/decreases depending on compressor capacity
Same
Higher
Lower
Dependent on other factors
It is inefficient
It is bulky
It requires cooling water for its operation
None of the above
In two phases
In three phases
In a single phase
In the form of air and water mixture
Centrifugal compressor
Axial compressor
Pumps
All of the above
Pressure ratio
Maximum cycle temperature
Minimum cycle temperature
All of the above
Large quantity of air at high pressure
Small quantity of air at high pressure
Small quantity of air at low pressure
Large quantity of air at low pressure
Radial flow
Axial flow
Centrifugal
None of the above
1.03 kg/cm²
1.06 kg/cm²
1.00 kg/cm²
0.53 kg/cm²
Isothermal compression
Adiabatic compression
Isentropic compression
Polytropic compression
Forward curved
Backward curved
Radial
None of these
Equal to
Less than
More than
None of these
Inlet losses
Impeller channel losses
Diffuser losses
All of the above
From an air conditioned room maintained at 20°C
From outside atmosphere at 1°C
From coal yard side
From a side where cooling tower is located nearby
Surrounding air
Compressed atmospheric air
Its own oxygen
None of these
10 bar
20 bar
30 bar
50 bar
Closed cycle
Open cycle
Both of the above
Closed/open depending on other considerations
Rise gradually towards the point of use
Drop gradually towards the point of use
Be laid vertically
Be laid exactly horizontally
(p₁ - p₂)/2
(p₁ + p₂)/2
p₁/p₂
p₁ p₂
Control temperature
Control output of turbine
Control fire hazards
Increase efficiency
Vacuum
Atmospheric air
Compressed air
Oxygen alone
Isothermally
Polytropically
Isentropically
None of these
Isothermal compression
Isentropic compression
Polytropic compression
None of these
As large as possible
As small as possible
About 50% of swept volume
About 100% of swept volume
1 to 5 bar
5 to 8 bar
8 to 10 bar
10 to 15 bar
Equal to
Less than
More than
None of these
The ratio of the discharge pressure to the inlet pressure of air is called compressor efficiency
The compression ratio for the compressor is always greater than unity
The compressor capacity is the ratio of workdone per cycle to the stroke volume
During isothermal compression of air, the workdone in a compressor is maximum
Equal to
Double
Three times
Six times
Carries its own oxygen
Uses surrounding air
Uses compressed atmospheric air
Does not require oxygen
Atmospheric conditions at any specific location
20°C and 1 kg/cm² and relative humidity of 36%
0°C and standard atmospheric conditions
15°C and 1 kg/cm²