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Steam Boilers, Engines, Nozzles and Turbines

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

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

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Steam Boilers, Engines, Nozzles and Turbines
The evaporation of 15.653 kg of water per hour from and at 100°C is called

One boiler h.p.
Equivalent evaporation
Evaporative capacity
Factor of evaporation

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Steam Boilers, Engines, Nozzles and Turbines
When the cross-section of a nozzle __________ continuously from entrance to exit, it is called a convergent nozzle.

None of these
Decreases
Remain same
Increases

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

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

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

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

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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)

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

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