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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
The economiser is used in boilers to

Increase flue gas temperature
Extract heat from the exhaust flue gases
Economize on fuel
Increase thermal efficiency of boiler

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Steam Boilers, Engines, Nozzles and Turbines
The pressure of feed water has to be raised before its entry into the boiler. The pressure is raised by a device known as

Feed check valve
Pressure gauge
Injector
Feed pump

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Steam Boilers, Engines, Nozzles and Turbines
The efficiency of a pressure-velocity compounded impulse turbine is __________ as compared to pressure compounded impulse turbine.

More
Same
None of these
Less

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Steam Boilers, Engines, Nozzles and Turbines
The stage efficiency (ηS) is given by (where ηB = Blading efficiency, and ηN = Nozzle efficiency)

ηS = ηN / ηB
ηS = ηB / ηN
ηS = ηB × ηN
None of the listed here

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Steam Boilers, Engines, Nozzles and Turbines
On Mollier chart, flow through turbine is represented by

Straight inclined line
Vertical straight line
Horizontal straight line
Curved line

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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

218 kg/cm² abs and 373°C
218 kg/cm² abs and 540°C
100 kg/cm² and 540°C
1 kg/cm² and 100°C

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