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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
The natural draught is produced by

Chimney
Steam jet
Centrifugal fan
Both (A) and (B)

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

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Steam Boilers, Engines, Nozzles and Turbines
The radius of a dished head is taken approximately as

Half
One fourth
Two
One

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Steam Boilers, Engines, Nozzles and Turbines
The pressure at which latent heat of vaporisation of water is zero, is

225.6 kg/cm²
100 kg/cm²
Below atmospheric pressure
1 kg/cm²

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Steam Boilers, Engines, Nozzles and Turbines
A safety valve in a locomotive starts leaking. The leaking medium will be

Super heated steam
Wet steam
Dry steam
Water

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Steam Boilers, Engines, Nozzles and Turbines
Mechanical equivalent of heat for 1 kcal or Joule's equivalent is equal to

539 kg.m
102 kg.m
421 kg.m
421 kg.m

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