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Steam Boilers, Engines, Nozzles and Turbines

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
Fire tube boilers are those in which

Flue gases pass through tubes and water around it
Tubes are laid vertically
Forced circulation takes place
Water passes through the tubes and flue gases around it

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Steam Boilers, Engines, Nozzles and Turbines
The high pressure and low pressure cylinders in a Woolf type compound engine are regarded as having cranks

180° to each other
0° to each other
None of these
90° to each other

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

0.601
0.577
0.546
0.582

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Steam Boilers, Engines, Nozzles and Turbines
Duplex feed pumps are used in small steam boilers. These operate on the principle of

Reciprocating pump
Centrifugal pump
Gear pump
Axial flow pump

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Steam Boilers, Engines, Nozzles and Turbines
The crown of the fire box is made hemispherical in order to

Give maximum space
Withstand pressure inside boiler
Resist intense heat in fire box
Give maximum strength

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