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Steam Boilers, Engines, Nozzles and Turbines

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

0.582
0.601
0.546
0.577

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Steam Boilers, Engines, Nozzles and Turbines
In impulse turbines, when friction is neglected, the relative velocity of steam at outlet tip of the blade is _________ the relative velocity of steam at inlet tip of the blade.

Less than
Equal to
Greater than
None of these

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

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

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Steam Boilers, Engines, Nozzles and Turbines
At very low temperature, the melting and boiling temperatures become equal. This temperature is

273.16°K
303°K
0°K
373°K

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Steam Boilers, Engines, Nozzles and Turbines
The radius of a dished head is taken approximately as

Two
Half
One fourth
One

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Steam Boilers, Engines, Nozzles and Turbines
In a throttling process

Steam entropy remains constant
Steam temperature remains constant
Steam enthalpy remains constant
Steam pressure remains constant

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