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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
Presence of moisture in fuel oil would

Because sputtering, possibly extinguishing flame
Aid in proper combustion
Clean the nozzles
Keep the burner tips cool

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Steam Boilers, Engines, Nozzles and Turbines
The maximum discharge of steam through a convergent-divergent nozzle depends upon

Both (A) and (B)
Initial pressure and volume of steam
Area of nozzle at throat
Final pressure of steam leaving the nozzle

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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

Equivalent evaporation
Power of a boiler
Factor of evaporation
Boiler efficiency

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Steam Boilers, Engines, Nozzles and Turbines
The ratio of the clearance volume to the swept volume is called

Clearance ratio
Expansion ratio
Cut-off ratio
None of these

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

0.546
0.582
0.577
0.601

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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
None of these
Equal to the velocity of sound

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