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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
The draught (in mm of water), for maximum discharge of flue gases through the chimney, is given by (where H = Height of the chimney in meters, and T1 = Absolute temperature of air outside the chimney in K)

T1 /88.25H
176.5H/T1
T1 /176.5H
88.25H/T1

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Steam Boilers, Engines, Nozzles and Turbines
Steam turbines may be classified according to

Number of stages
All of these
Direction of steam flow
Mode of steam action

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Steam Boilers, Engines, Nozzles and Turbines
The capacity of induced draft fan compared to forced draft fan in a boiler is

Less
Less or more depending on size of boiler
Same
More

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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.

Less
Same
None of these
More

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Steam Boilers, Engines, Nozzles and Turbines
An economiser is generally placed between

Air preheater and chimney
None of these
Last superheater or reheater and air preheater
Induced draft fan and forced draft fan

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

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

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