Isothermally
Polytropically
Isentropically
None of these
C. Isentropically
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
One adiabatic, two isobaric, and one constant volume
Two adiabatic and two isobaric
Two adiabatic, one isobaric and one constant volume
One adiabatic, one isobaric and two constant volumes
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
Is self operating at zero flight speed
Is not self operating at zero flight speed
Requires no air for its operation
Produces a jet consisting of plasma
Gas turbine uses low air-fuel ratio to economise on fuel
Gas turbine uses high air-fuel ratio to reduce outgoing temperature
Gas turbine uses low air-fuel ratio to develop the high thrust required
All of the above
Increase
Decrease
Remain unaffected
Other factors control it
Compressor capacity
Compression ratio
Compressor efficiency
Mean effective pressure
Paucity of O2
Increasing gas temperature
High specific volume
High friction losses
Back pressure
Critical pressure
Discharge pressure
None of these
Gas turbine
4-stroke petrol engine
4-stroke diesel engine
Multi cylinder engine
More
Less
Same
Depends on other factors
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
Isothermal H.P/indicated H.R
Isothermal H.P./shaft H.R
Total output/air input
Compression work/motor input
700°C
2000°C
1500°C
1000°C
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
At very high speed
At very slow speed
At average speed
At zero speed
Directly proportional to clearance volume
Greatly affected by clearance volume
Not affected by clearance volume
Inversely proportional to clearance volume
0.1 %
0.5 %
1.0 %
5 %
Compressor pressure ratio
Highest pressure to exhaust pressure
Inlet pressure to exhaust pressure
Pressures across the turbine
Compressor efficiency
Volumetric efficiency
Isothermal efficiency
Mechanical efficiency
Cool the air
Decrease the delivery temperature for ease in handling
Cause moisture and oil vapour to drop out
Reduce volume
They can generate very high thrust
They have high propulsion efficiency
These engines can work on several fuels
They are not air breathing engines
Centrifugal compressor
Axial compressor
Pumps
All of the above
Increases
Decreases
Remain constant
First decreases and then increases
Pressure ratio
Maximum cycle temperature
Minimum cycle temperature
All of the above
Increase velocity
Make the flow streamline
Convert pressure energy into kinetic energy
Convert kinetic energy into pressure energy
Compression index
Compression ratio
Compressor efficiency
Mean effective pressure
The compression ratio in each stage should be same
The intercooling should be perfect
The workdone in each stage should be same
All of the above
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