No propeller
Propeller in front
Propeller at back
Propeller on the top
A. No propeller
Increases
Decreases
Remain same
First increases and then decreases
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
Does not change
Increases
Decreases
First decrease and then increase
Compressor capacity
Compression ratio
Compressor efficiency
Mean effective pressure
There is no pressure drop in the intercooler
The compression in both the cylinders is polytropic
The suction and delivery of air takes place at constant pressure
All of the above
1
1.2
1.3
1.4
Increases with decrease in compression ratio
Decreases with decrease in compression ratio
Increases with increase in compression ratio
Decreases with increase in compression ratio
Better lubrication is possible advantages of multistage
More loss of air due to leakage past the cylinder
Mechanical balance is better
Air can be cooled perfectly in between
Centrifugal type
Axial flow type
Radial flow type
None of these
At very high speed
At very slow speed
At average speed
At zero speed
0.1 bar and 20°C
1 bar and 20°C
0.1 bar and 40°C
1 bar and 40°C
Same
Higher
Lower
None of these
Less
More
Same
May be less or more depending on ambient conditions
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
Work required to compress the air isothermally to the actual work required to compress the air for the same pressure ratio
Isothermal power to the shaft power or B.P. of the motor or engine required to drive the compressor
Volume of free air delivery per stroke to the swept volume of the piston
Isentropic power to the power required to drive the compressor
Decreasing the compression work
Increasing the compression work
Increasing the turbine work
Both (A) and (C) above
To supply base load requirements
To supply peak load requirements
To enable start thermal power plant
In emergency
Slip factor
Velocity factor
Velocity coefficient
None of the above
Less
More
Same
More/less depending on compressor capacity
Decreases
Increases
Does not change
None of these
Pressure drop across the valves
Superheating in compressor
Clearance volume and leakages
All of these
Increase temperature
Reduce turbine size
Increase power output
Increase speed
10 : 1
15 : 1
20 : 1
60 : 1
1.03 kg/cm²
1.06 kg/cm²
1.00 kg/cm²
0.53 kg/cm²
6 kg/cm²
10 kg/cm²
16 kg/cm²
25 kg/cm²
Toughness
Fatigue
Creep
Corrosion resistance
Higher
Lower
Same
None of the above
Lower power consumption per unit of air delivered
Higher volumetric efficiency
Decreased discharge temperature
All of the above
Reheating
Inter cooling
Adding a regenerator
All of the above
Same
More
Less
Zero