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
B. Volumetric efficiency is high
Same
Lower
Higher
None of these
N.T.P. conditions
Intake temperature and pressure conditions
0°C and 1 kg/cm²
20°C and 1 kg/cm²
Electric motor
Engine
Either (A) or (B)
None of these
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
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
Poppet valve
Mechanical valve of the Corliss, sleeve, rotary or semi rotary type
Disc or feather type
Any of the above
Radial flow compressor
Axial flow compressor
Roots blower
Reciprocating compressor
Multistage compression
Cold water spray
Both (A) and (B) above
Fully insulating the cylinder
Less
More
Same
May be less or more depending upon speed
W₁/W₂ = n₂(n₁ - 1)/n₁(n₂ - 1)
W₁/W₂ = n₁(n₂ - 1)/n₂(n₁ - 1)
W₁/W₂ = n₁/n₂
W₁/W₂ = n₂/n₁
Atmosphere
Vacuum
Discharge nozzle
Back to the compressor
Diffuser inlet radius
Diffuser outlet radius
Impeller inlet radius
Impeller outlet radius
A propeller system
Gas turbine engine equipped with a propulsive nozzle and diffuse
Chemical rocket engine
Ramjet engine
Turbojet engine
Ramjet engine
Propellers
Rockets
Turbojet
Turbo-propeller
Rocket
Ramjet
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
Compression index
Compression ratio
Compressor efficiency
Mean effective pressure
3 m³/ mt.
1.5 m³/ mt.
18 m³/ mt.
6 m³/ mt.
More
Less
Same
Depends on other factors
Small quantities of air at high pressures
Large quantities of air at high pressures
Small quantities of air at low pressures
Large quantities of air at low pressures
p₂/p₁ = p₃/p₂ = p₄/p₃
p₃/p₁ = p₄/p₂
p₁ p₂ = p₃ p₄
p₁ p₃ = p₂ p₄
One air stream
Two or more air streams
No air stream
Solid fuel firing
Compressor efficiency
Volumetric efficiency
Isothermal efficiency
Mechanical efficiency
20 - 30 %
40 - 50 %
60 - 70 %
70 - 90 %
6 kg/cm²
10 kg/cm²
16 kg/cm²
25 kg/cm²
In two phases
In three phases
In a single phase
In the form of air and water mixture
34 %
50 %
60 %
72 %
Isothermal compression
Isentropic compression
Polytropic compression
None of these
Reduction of speed of incoming air and conversion of part of it into pressure energy
Compression of inlet air
Increasing speed of incoming air
Lost work