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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 critical pressure gives the velocity of steam at the throat

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

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Steam Boilers, Engines, Nozzles and Turbines
The rate of discharge through the nozzle ___ when the exit pressure is gradually reduced.

None of the listed here
Increases
Remains same
Decreases

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Steam Boilers, Engines, Nozzles and Turbines
The critical pressure ratio for initially dry saturated steam is

0.582
0.601
0.577
0.546

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Steam Boilers, Engines, Nozzles and Turbines
The amount of water evaporated in kg per kg of fuel burnt is called

Evaporative capacity of a boiler
None of these
Boiler efficiency
Equivalent evaporation from and at 100° C

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Steam Boilers, Engines, Nozzles and Turbines
The safety valve at superheater as compared to drum safety valve setting is set at

Higher value
Same value
Lower value
Any value

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