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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
The critical pressure ratio for gases is

0.528
0.582
0.546
0.577

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Steam Boilers, Engines, Nozzles and Turbines
The process of maintaining the speed of the turbine constant for various load conditions, is known as

None of these
Bleeding
Reheating
Governing

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Steam Boilers, Engines, Nozzles and Turbines
A single stage impulse turbine with a diameter of 1.2 m runs at 3000 r.p.m. If the blade speed ratio is 0.42, then the inlet velocity of steam will be

188 m/s
79 m/s
450 m/s
900 m/s

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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

302 kW
260 kW
296 kW
282 kW

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Steam Boilers, Engines, Nozzles and Turbines
Stage efficiency is also known as

Gross efficiency
Nozzle efficiency
None of these
Diagram efficiency

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Steam Boilers, Engines, Nozzles and Turbines
The pressure compounded impulse turbine as compared to velocity compounded turbine require __________ number of stages.

Less
More
Same
None of these

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