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Steam Boilers, Engines, Nozzles and Turbines

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
Governing
Reheating

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Steam Boilers, Engines, Nozzles and Turbines
Primary air is the air used to

Convert CO (formed in lower zone of furnace) into CO₂ at higher zone
Provide air around burners for obtaining optimum combustion
Transport and dry the coal
Air delivered by forced draft fan

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

0.601
0.582
0.546
0.577

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Steam Boilers, Engines, Nozzles and Turbines
The flow through a nozzle is regarded as

Constant pressure flow
Constant volume flow
Isentropic flow
Isothermal flow

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Steam Boilers, Engines, Nozzles and Turbines
The crown of the fire box is made hemispherical in order to

Give maximum space
Give maximum strength
Resist intense heat in fire box
Withstand pressure inside boiler

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Steam Boilers, Engines, Nozzles and Turbines
In a De-Laval nozzle expanding superheated steam from 10 bar to 0.1 bar, the pressure at the minimum cross-section (i. e. pressure at throat, p₂) will be

8.2 bar
9.9 bar
3.3 bar
5.46 bar

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