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Steam Boilers, Engines, Nozzles and Turbines

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

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

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Steam Boilers, Engines, Nozzles and Turbines
In water wall furnace, the heat is transferred to the water walls by

Conduction
Convection
Radiation and conduction
Radiation

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Steam Boilers, Engines, Nozzles and Turbines
An economiser in a boiler

Increases steam flow
Decreases fuel consumption
Increases steam pressure
Decreases steam pressure

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Steam Boilers, Engines, Nozzles and Turbines
Equivalent evaporation is the amount of water evaporated in a boiler from and at

Room temperature
Saturation temperature at given pressure
0°C
100°C

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Steam Boilers, Engines, Nozzles and Turbines
Over fire burning is the phenomenon of

Supply of excess, air
Burning CO and unburnt in upper zone of furnace by supplying more air
Fuel bed firing
Supply of excess coal

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Steam Boilers, Engines, Nozzles and Turbines
The pressure at which latent heat of vaporisation of water is zero, is

225.6 kg/cm²
Below atmospheric pressure
1 kg/cm²
100 kg/cm²

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MORE MCQ ON Steam Boilers, Engines, Nozzles and Turbines

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