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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
When the back pressure of a nozzle is below the designed value of pressure at exit of nozzle, the nozzle is said to be

Choked
Over-damping
None of these
Under-damping

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Steam Boilers, Engines, Nozzles and Turbines
The variation of steam pressure in the nozzle depends upon

Velocity of steam
Specific volume of steam
Dryness fraction of steam
All of these

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

Moisture present in the fuel
All of these
Steam formed by combustion of hydrogen per kg of fuel
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 Locomotive boiler has

167 fire tubes and 14 superheated tubes
147 fire tubes and 34 superheated tubes
137 fire tubes and 44 superheated tubes
157 fire tubes and 24 superheated tubes

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Steam Boilers, Engines, Nozzles and Turbines
The missing quantity per stroke is equal to

Mass of cushion steam + cylinder feed
Cylinder feed indicated mass of steam
Mass of cushion steam + indicated mass of steam
Cylinder feed + indicated mass of steam

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Steam Boilers, Engines, Nozzles and Turbines
In order to compare the capacity of boilers, the feed water temperature and working pressure are taken as

50°C and normal atmospheric pressure
100°C and normal atmospheric pressure
100°C and 1.1 bar pressure
50°C and 1.1 bar pressure

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