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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
The supersaturated flow of steam through a nozzle as compared to a stable flow, the available heat drop

Is unpredictable
Remains the same
Increases
Decreases

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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

1 kg/cm² and 100°C
218 kg/cm² abs and 540°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 pressure of steam __________ while flowing through a nozzle.

Decreases
Remains constant
None of these
Increases

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Steam Boilers, Engines, Nozzles and Turbines
An air preheater

Increases the efficiency of the boiler
All of these
Enables low grade fuel to be burnt
Increases evaporative capacity of the boiler

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Steam Boilers, Engines, Nozzles and Turbines
For the same length of stroke and speed of crankshaft, the piston speed for a double acting steam engine is _________ the piston speed of single acting steam engine.

Equal to
Four times
Twice
Three times

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Steam Boilers, Engines, Nozzles and Turbines
The effect of super-saturation is that the

Entropy and specific volume of the steam increases
All of these
Mass of the steam discharged increases
Exit velocity of steam reduces

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