Compresses 3 m³/min of standard air
Compresses 3 m³/ min of free air
Delivers 3 m³/ min of compressed air
Delivers 3 m³/ min of compressed air at delivery pressure
B. Compresses 3 m³/ min of free air
Reciprocating compressor
Centrifugal compressor
Axial flow compressor
Turbo compressor
Gas turbine plant
Petrol engine
Diesel engine
Solar plant
Increases as clearance volume increases
Decreases as clearance volume increases
Is independent of clearance volume
Increases as clearance volume decreases
Decreases net output but increases thermal efficiency
Increases net output but decreases thermal efficiency
Decreases net output and thermal efficiency both
Increases net output and thermal efficiency both
Equal to
Less than
Greater than
None of these
To cool the air during compression
To cool the air at delivery
To enable compression in two stages
To minimise the work of compression
Same
Higher
Lower
None of these
700°C
2000°C
1500°C
1000°C
Radial flow compressor
Axial flow compressor
Roots blower
Reciprocating compressor
Isothermal
Isentropic
Adiabatic
Isochoric
Compressor efficiency
Isothermal efficiency
Volumetric efficiency
Mechanical efficiency
Isothermal compression
Isentropic compression
Polytropic compression
None of these
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
Atmosphere
Back to the compressor
Discharge nozzle
Vacuum
Centrifugal pump
Reciprocating pump
Turbine
Sliding vane compressor
Compressor efficiency
Volumetric efficiency
Isothermal efficiency
Mechanical efficiency
Same
One-half
One fourth
One sixth
Atmospheric
Slightly more than atmospheric
Slightly less than atmospheric
Pressure slightly less than atmospheric and temperature slightly more than atmospheric
Increases with decrease in compression ratio
Decreases with decrease in compression ratio
Increases with increase in compression ratio
Decreases with increase in compression ratio
Backward curved blades has poor efficiency
Backward curved blades lead to stable performance
Forward curved blades has higher efficiency
Forward curved blades produce lower pressure ratio
Electric motor
Engine
Either (A) or (B)
None of these
Compressor pressure ratio
Highest pressure to exhaust pressure
Inlet pressure to exhaust pressure
Pressures across the turbine
7 : 1
15 : 1
30 : 1
50 : 1.
Reduced volume flow rate
Increased volume flow rate
Lower suction pressure
Lower delivery pressure
Power consumption per unit of air delivered is low
Volumetric efficiency is high
It is best suited for compression ratios around 7:1
The moisture in air is condensed in the intercooler
High h.p. and low weight
Low weight and small frontal area
Small frontal area and high h.p.
High speed and high h.p
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
Large gas turbines use radial inflow turbines
Gas turbines have their blades similar to steam turbine
Gas turbine's blade will appear as impulse section at the hub and as a reaction section at tip
Gas turbines use both air and liquid cooling
Requires less space for installation
Has compressor and combustion chamber
Has less efficiency
All of these
Work done in first stage should be more
Work done in subsequent stages should increase
Work done in subsequent stages should decrease
Work done in all stages should be equal