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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
During polytropic process

Work is done
All of these
Steam may be wet, dry or superheated after expansion
Heat transfer takes place across cylinder walls

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Steam Boilers, Engines, Nozzles and Turbines
In order to reduce the rotor speed of an impulse turbine, the method employed is

All of these
Velocity compounding
Pressure-velocity compounding
Pressure compounding

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Steam Boilers, Engines, Nozzles and Turbines
The critical pressure ratio for initially dry saturated steam is

0.577
0.601
0.546
0.582

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Steam Boilers, Engines, Nozzles and Turbines
In a 50% reaction turbine stage, tangential component of absolute velocity at rotor inlet is 537 m/s and the blade velocity is 454 m/s. The power output in kW of steam will be

282 kW
302 kW
260 kW
296 kW

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Steam Boilers, Engines, Nozzles and Turbines
Lancashire boiler is

Horizontal boiler
Internally fired boiler
All of these
Stationary fire tube boiler

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Steam Boilers, Engines, Nozzles and Turbines
The ratio of brake power to the indicated power is known as

Overall efficiency
Indicated thermal efficiency
Brake thermal efficiency
Mechanical efficiency

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