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Steam Boilers, Engines, Nozzles and Turbines

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

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

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Steam Boilers, Engines, Nozzles and Turbines
The height of chimney in a power plant is governed by

Quantity of flue gases to be handled
Control of pollution
The draft to be created
Limitation of construction facilities

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Steam Boilers, Engines, Nozzles and Turbines
The critical pressure ratio for initially superheated steam is __________ as compared to initially dry saturated steam.

None of these
More
Less
Same

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Steam Boilers, Engines, Nozzles and Turbines
Green coal, in order to be burnt, must be

Heated to its ignition point
Burnt as powder
Burnt in excess air
Heated sufficiently

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Steam Boilers, Engines, Nozzles and Turbines
The increase in pressure

Lowers the boiling point of a liquid
Raises the boiling point of a liquid
Does not affects the boiling point of a liquid
Reduces its volume

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Steam Boilers, Engines, Nozzles and Turbines
Natural water circulation, by convection in water tube boilers, with increase in pressure of boiler

Increases
First increases and then decreases
Decreases
Remain unaffected

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