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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
The critical pressure gives the velocity of steam at the throat

More than the velocity of sound
Less than the velocity of sound
Equal to the velocity of sound
None of these

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Steam Boilers, Engines, Nozzles and Turbines
With increase in load, convection superheater has

Drooping characteristic
Flat characteristic
Rising characteristic
Linear characteristic

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Steam Boilers, Engines, Nozzles and Turbines
The ratio of heat actually used in producing the steam to the heat liberated in the furnace, is known as

Boiler efficiency
Power of a boiler
Equivalent evaporation
Factor of evaporation

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Steam Boilers, Engines, Nozzles and Turbines
A supercritical boiler is one that operates above the pressure and temperature of following values

218 kg/cm² abs and 540°C
1 kg/cm² and 100°C
218 kg/cm² abs and 373°C
100 kg/cm² and 540°C

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

Increases
None of these
Decreases
Has no effect on

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

Increases
Remain unaffected
First increases and then decreases
Decreases

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