Conversion of pressure energy into kinetic energy
Conversion of kinetic energy into pressure energy
Centripetal action
Generating pressure directly
B. Conversion of kinetic energy into pressure energy
Inlet whirl velocity
Outlet whirl velocity
Inlet velocity of flow
Outlet velocity of flow
0.1 to 1.2 m³/s
0.15 to 5 m³/s
Above 5 m³/s
None of these
Isothermal H.P/indicated H.R
Isothermal H.P./shaft H.R
Total output/air input
Compression work/motor input
p₂/p₁ = p₃/p₂ = p₄/p₃
p₃/p₁ = p₄/p₂
p₁ p₂ = p₃ p₄
p₁ p₃ = p₂ p₄
Low frontal area
Higher thrust
High pressure rise
None of these
Same
Lower
Higher
None of these
Mass flow rate
Pressure ratio
Change in load
Stagnation pressure at the outlet
Free air delivery
Compressor capacity
Swept volume
None of these
Large discharge at high pressure
Low discharge at high pressure
Large discharge at low pressure
Low discharge at low pressure
Electric motor
Engine
Either (A) or (B)
None of these
Pressure ratio
Pressure coefficient
Degree of reaction
Slip factor
Increase of work ratio
Decrease of thermal efficiency
Decrease of work ratio
Both (A) and (B) above
Equal to
Double
Three times
Six times
D₁/D₂ = (p₁ p₃)1/2
D₁/D₂ = (p₁/p₃)1/4
D₁/D₂ = (p₁ p₃)1/4
D₁/D₂ = (p₃/p₁)1/4
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
Equal to zero
In the direction of motion of blades
Opposite to the direction of motion of blades
Depending on the velocity
Jet velocity
Twice the jet velocity
Half the jet velocity
Average of the jet velocity
Ammonia and water vapour
Carbon dioxide
Nitrogen
Hydrogen
Compressor capacity
Compression ratio
Compressor efficiency
Mean effective pressure
34 %
50 %
60 %
72 %
(v₁² -v₂²)/2g
(v₁ - v₂)²/2g
(v₁² -v₂²)/g
(v₁ - v₂)²/g
Stainless steel
High alloy steel
Duralumin
Timken, Haste alloys
Increases with increase in compression ratio
Decreases with increase in compression ratio
In not dependent upon compression ratio
May increase/decrease depending on compressor capacity
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
Ideal compression
Adiabatic compression
Isentropic compression
Isothermal compression
To cool the air during compression
To cool the air at delivery
To enable compression in two stages
To minimise the work of compression
Reduced
Increased
Zero
None of these
Equal to
Less than
More than
None of these
Reduced volume flow rate
Increased volume flow rate
Lower suction pressure
Lower delivery pressure
Centrifugal pump
Reciprocating pump
Turbine
Sliding vane compressor