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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
A device in which some portion of waste heat of flue gases is recovered to heat the air before it passes to the furnace for combustion purpose, is known as

Injector
Superheater
Air-preheater
Economizer

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Steam Boilers, Engines, Nozzles and Turbines
In a uniflow engine

Steam enters at the centre and exhausts at the other end
Steam enters and exhausts through the same port
Steam enters at one end and exhausts at the centre
None of these

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Steam Boilers, Engines, Nozzles and Turbines
Cut-off ratio is the ratio of

Clearance volume to the volume at cut-off
Volume at cut-off to the clearance volume
Swept volume to the volume at cut-off
Volume at cut-off to the swept volume

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

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

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Steam Boilers, Engines, Nozzles and Turbines
Clearance ratio is the ratio of

Clearance volume to the volume at cut-off
Swept volume to the clearance volume
Volume at cut-off to the swept volume
Clearance volume to the swept volume

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Steam Boilers, Engines, Nozzles and Turbines
The diameter of internal flue tubes of a Lancashire boiler is about ___ that of its shell.

Two-fifth
One-third
One-half
One-fourth

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