2 kg/cm²
6 kg/cm²
10 kg/cm²
14.7 kg/cm²
A. 2 kg/cm²
More power
Less power
Same power
More/less power depending on other factors
Injecting water into the compressor
Burning fuel after gas turbine
Injecting ammonia into the combustion chamber
All of the above
Forward curved
Backward curved
Radial
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
Work required to compress the air isothermally to the actual work required to compress the air for the same pressure ratio
Isothermal power to the shaft power or B.P. of the motor or engine required to drive the compressor
Volume of free air delivery per stroke to the swept volume of the piston
Isentropic power to the power required to drive the compressor
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
Carbonisation of coal
Passing steam over incandescent coke
Passing air and a large amount of steam over waste coal at about 65°C
Partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast
Lower at low speed
Higher at high altitudes
Same at all altitudes
Higher at high speed
As large as possible
As small as possible
About 50% of swept volume
About 100% of swept volume
High thermal efficiency
Reduction in compressor work
Decrease of heat loss in exhaust
Maximum work output
Remain same
Decrease
Increase
None of the above
Same
Higher
Lower
Dependent on other factors
Atmospheric conditions at any specific location
20°C and 1 kg/cm² and relative humidity 36%
0°C and standard atmospheric conditions
15°C and 1 kg/cm²
Isothermal
Adiabatic
Polytropic
None of the above
Isothermally
Polytropically
Isentropically
None of these
In a two stage reciprocating air compressor with complete intercooling, maximum work is saved.
The minimum work required for a two stage reciprocating air compressor is double the work required for each stage.
The ratio of the volume of free air delivery per stroke to the swept volume of the piston is called volumetric efficiency.
None of the above
Larger air handling ability per unit frontal area
Higher pressure ratio per stage
Aerofoil blades are used
Higher average velocities
Same
More
Less
Depends on other factors
Increases
Decreases
Remain constant
First decreases and then increases
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
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
Indicated power
Brake power
Frictional power
None of these
550 km/hr
1050 km/hr
1700 km/hr
2400 km/hr
A propeller system
Gas turbine engine equipped with a propulsive nozzle and diffuse
Chemical rocket engine
Ramjet engine
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
Increases as clearance volume increases
Decreases as clearance volume increases
Is independent of clearance volume
Increases as clearance volume decreases
Does not change
Increases
Decreases
First decrease and then increase
Gas turbine requires lot of cooling water
Gas turbine is capable of rapid start up and loading
Gas turbines has flat efficiency at part loads
Gas turbines have high standby losses and require lot of maintenance
Radial flow compressor
Axial flow compressor
Roots blower
Reciprocating compressor
Compressor efficiency
Isentropic efficiency
Euler's efficiency
Pressure coefficient