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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
Film boiling occurs at

Atmospheric pressures
Very high pressures
Very low pressure
Medium pressures

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Steam Boilers, Engines, Nozzles and Turbines
The diameter of cylindrical shell of the Lancashire boiler is of the order of

1 to 1.75 m
1 to 1.25 m
2 to 4 m
1.75 to 2.75 m

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Steam Boilers, Engines, Nozzles and Turbines
The capacity of induced draft fan compared to forced draft fan in a boiler is

More
Same
Less
Less or more depending on size of boiler

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

Transport and dry the coal
Cool the scanners
Convert CO (formed in lower zone of furnace) into CO₂ at higher zone
Provide air around burners for obtaining optimum combustion

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Steam Boilers, Engines, Nozzles and Turbines
The relative heat absorption for successively added equal areas of boiler convection heating surfaces

First increases and then decreases
Remain unaffected
Increases
Decreases

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Steam Boilers, Engines, Nozzles and Turbines
The coal requirement per kW hour generation in the thermal power plant is of the order of

0.6 to 0.8 kg
1.0 to 1.5 kg
0.2 to 0.4 kg
0.1 to 0.2 kg

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