Directly proportional to clearance volume
Greatly affected by clearance volume
Not affected by clearance volume
Inversely proportional to clearance volume
C. Not affected by clearance volume
Actual volume of the air delivered by the compressor when reduced to normal temperature and pressure conditions
Volume of air delivered by the compressor
Volume of air sucked by the compressor during its suction stroke
None of the above
Less power requirement
Better mechanical balance
Less loss of air due to leakage past the cylinder
Lower volumetric efficiency
Higher
Lower
Same
None of the above
Remain same
Decrease
Increase
None of the above
High calorific value
Ease of atomisation
Low freezing point
Both (A) and (C) above
Centrifugal
Reciprocating
Axial
Screw
In gas turbine plants
For operating pneumatic drills
In starting and supercharging of I.C. engines
All of the above
Compression index
Compression ratio
Compressor efficiency
Mean effective pressure
3 m³/ mt.
1.5 m³/ mt.
18 m³/ mt.
6 m³/ mt.
Air stream blocking the passage
Motion of air at sonic velocity
Unsteady periodic and reversed flow
Air stream not able to follow the blade contour
Centrifugal type
Reciprocating type
Lobe type
Axial flow type
The flow of air is parallel to the axis of the compressor
The static pressure of air in the impeller increases in order to provide centripetal force on the air
The impeller rotates at high speeds
The maximum efficiency is higher than multistage axial flow compressors
More
Less
Same
Depends on other factors
Rise gradually towards the point of use
Drop gradually towards the point of use
Be laid vertically
Be laid exactly horizontally
Same
More
Less
Zero
Vi = Vo
Vt > Vo
U < Vo
V = Uo
Radial flow compressors
Axial flow compressors
Pumps
All of these
It requires very big cylinder
It does not increase pressure much
It is impossible in practice
Compressor has to run at very slow speed to achieve it
Large gas turbines employ axial flow compressors
Axial flow compressors are more stable than centrifugal type compressors but not as efficient
Axial flow compressors have high capacity and efficiency
Axial flow compressors have instability region of operation
Gauge discharge pressure to the gauge intake pressure
Absolute discharge pressure to the absolute intake pressure
Pressures at discharge and suction corresponding to same temperature
Stroke volume and clearance volume
Centrifugal type
Axial flow type
Radial flow type
None of these
Compressor capacity
Compression ratio
Compressor efficiency
Mean effective pressure
H.P. compressor is connected to H.P. turbine and L.P. compressor to L.P. turbine
H.P. compressor is connected to L.P. turbine and L.P. compressor is connected to H.P. turbine
Both the arrangements can be employed
All are connected in series
High thermal efficiency
Reduction in compressor work
Decrease of heat loss in exhaust
Maximum work output
1 to 5 bar
5 to 8 bar
8 to 10 bar
10 to 15 bar
Atmosphere
Back to the compressor
Discharge nozzle
Vacuum
p₂/p₁ = p₃/p₂ = p₄/p₃
p₃/p₁ = p₄/p₂
p₁ p₂ = p₃ p₄
p₁ p₃ = p₂ p₄
Thrust power and fuel energy
Engine output and propulsive power
Propulsive power and fuel input
Thrust power and propulsive power
D₁/D₂ = (p₁ p₃)1/2
D₁/D₂ = (p₁/p₃)1/4
D₁/D₂ = (p₁ p₃)1/4
D₁/D₂ = (p₃/p₁)1/4
Control temperature
Control output of turbine
Control fire hazards
Increase efficiency