Increases
Decreases
Remain constant
First decreases and then increases
C. Remain constant
10 to 40 %
40 to 60 %
60 to 70 %
70 to 90 %
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
p₂ = p₁ × p₃
p₂ = p₁/p₃
p₂ = p₁ × p₂
p₂ = p₃/p₁
More power
Less power
Same power
More/less power depending on other factors
Isothermal H.P/indicated H.R
Isothermal H.P./shaft H.R
Total output/air input
Compression work/motor input
Provides greater flexibility
Provides lesser flexibility
In never used
Is used when gas is to be burnt
Mass
Energy
Flow
Linear momentum
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
Brayton or Atkinson cycle
Rankine cycle
Carnot cycle
Erricson cycle
The reciprocating compressors are best suited for high pressure and low volume capacity
The effect of clearance volume on power consumption is negligible for the same volume of discharge
Both (A) and (B)
None of these
The ratio of stroke volume to clearance volume
The ratio of the air actually delivered to the amount of piston displacement
Reciprocal of compression ratio
Index of compressor performance
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
Equal to
Double
Three times
Six times
Thrust and range of aircraft
Efficiency of the engine
Both (A) and (B)
None of these
(p₁ - p₂)/2
(p₁ + p₂)/2
p₁/p₂
p₁ p₂
Same
Less
More
None of these
Lower at low speed
Higher at high altitudes
Same at all altitudes
Higher at high speed
Gas turbine is a self starting unit
Gas turbine does not require huge quantity of water like steam plant
Exhaust losses in gas turbine are high due to large mass flow rate
Overall efficiency of gas turbine plant is lower than that of a reciprocating engine
Top side of main
Bottom side of main
Left side of main
Right side of main
Isothermally
Adiabatically
Isentropically
Isochronically
Higher
Lower
Equal
Cant be compared
Increases power output
Improves thermal efficiency
Reduces exhaust temperature
Do not damage turbine blades
Exit nozzle, which is a constant volume process
Exit nozzle, which is essentially an isentropic process
Turbine blades, which is a constant volume process
Turbine blades, which is essentially an isentropic process
Increase of work ratio
Decrease of thermal efficiency
Decrease of work ratio
Both (A) and (B) above
1 : 1.2
1 : 2
1 : 5
1 : 10
2 : 1
4 :1
61 : 1
9 : 1
10 bar
20 bar
30 bar
50 bar
Decreases
Increases
Does not change
None of these
Reheating
Inter cooling
Adding a regenerator
All of the above
Centrifugal compressors deliver practically constant pressure over a considerable range of capacities
Axial flow compressors have a substantially constant delivery at variable pressures
Centrifugal compressors have a wider stable operating range than axial flow compressors
Axial flow compressors are bigger in diameter compared to centrifugal type