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
C. Gas turbine's blade will appear as impulse section at the hub and as a reaction section at tip
Pulsejet requires no ambient air for propulsion
Ramjet engine has no turbine
Turbine drives compressor in a Turbojet
Bypass turbojet engine increases the thrust without adversely affecting, the propulsive efficiency and fuel economy
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
The combustion chamber in a rocket engine is directly analogous to the reservoir of a supersonic wind tunnel
The stagnation conditions exist at the combustion chamber
The exit velocities of exhaust gases are much higher than those in jet engine
All of the above
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
Top side of main
Bottom side of main
Left side of main
Right side of main
Decreases net output but increases thermal efficiency
Increases net output but decreases thermal efficiency
Decreases net output and thermal efficiency both
Increases net output and thermal efficiency both
Closed cycle gas turbine is an I.C engine
Gas turbine uses same working fluid over and over again
Ideal efficiency of closed cycle gas turbine plant is more than Carnot cycle efficiency
Thrust in turbojet is produced by nozzle exit gases.
Provides greater flexibility
Provides lesser flexibility
In never used
Is used when gas is to be burnt
Compressor efficiency
Volumetric efficiency
Isothermal efficiency
Mechanical efficiency
To supply base load requirements
To supply peak load requirements
To enable start thermal power plant
In emergency
Forward curved
Backward curved
Radial
None of these
Control temperature
Control output of turbine
Control fire hazards
Increase efficiency
As large as possible
As small as possible
About 50% of swept volume
About 100% of swept volume
Thrust power and fuel energy
Engine output and propulsive power
Propulsive power and fuel input
Thrust power and propulsive power
Brayton or Atkinson cycle
Carnot cycle
Rankine cycle
Erricson cycle
Less power requirement
Better mechanical balance
Less loss of air due to leakage past the cylinder
Lower volumetric efficiency
Compression ratio
Work ratio
Pressure ratio
None of these
Pressure ratio
Pressure coefficient
Degree of reaction
Slip factor
Less
More
Same
May be less or more depending upon speed
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
2 : 1
4 :1
61 : 1
9 : 1
Atmospheric
Slightly more than atmospheric
Slightly less than atmospheric
Pressure slightly less than atmospheric and temperature slightly more than atmospheric
Radial flow compressors
Axial flow compressors
Pumps
All of these
Isothermal compression
Adiabatic compression
Isentropic compression
Polytropic compression
A.C. electric motor
Compressed air
Petrol engine
Diesel engine
The ratio of the discharge pressure to the inlet pressure of air is called compressor efficiency
The compression ratio for the compressor is always greater than unity
The compressor capacity is the ratio of workdone per cycle to the stroke volume
During isothermal compression of air, the workdone in a compressor is maximum
Equal to
Less than
More than
None of these
kg/m²
kg/m³
m³/min
m³/kg
Reheating
Inter cooling
Adding a regenerator
All of the above