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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

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

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Steam Boilers, Engines, Nozzles and Turbines
The ratio of the temperature rise of cooling water to the vacuum temperature minus inlet cooling water temperature is called

Nozzle efficiency
Boiler efficiency
Condenser efficiency
Vacuum efficiency

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Steam Boilers, Engines, Nozzles and Turbines
In a nozzle, the effect of super-saturation is to

Decrease specific volume of steam
Increase the heat drop
Decrease dryness fraction of steam
Increase the entropy

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Steam Boilers, Engines, Nozzles and Turbines
The heat balance sheet for the boiler shows the

Moisture present in the fuel
Steam formed by combustion of hydrogen per kg of fuel
All of these
Complete account of heat supplied by 1 kg of dry fuel and the heat consumed

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Steam Boilers, Engines, Nozzles and Turbines
The friction in the nozzle __________ exit velocity of steam.

Increases
None of these
Has no effect on
Decreases

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Steam Boilers, Engines, Nozzles and Turbines
Which of the following substance will have same percentage in both proximate and ultimate analysis?

Hydrogen
Ash
Moisture
Volatile matter

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