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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
The stage efficiency (ηS) is given by (where ηB = Blading efficiency, and ηN = Nozzle efficiency)

ηS = ηB / ηN
ηS = ηB × ηN
None of the listed here
ηS = ηN / ηB

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Steam Boilers, Engines, Nozzles and Turbines
For the same diameter and thickness of tube, a water tube boiler has ________ heating surface as compared to fire tube boiler.

None of these
More
Equal
Less

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Steam Boilers, Engines, Nozzles and Turbines
De-Laval turbine is a

Simple impulse turbine
Impulse-reaction turbine
Simple reaction turbine
None of these

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Steam Boilers, Engines, Nozzles and Turbines
The state of vapor under saturation condition is described by

Temperature alone
Pressure and temperature
Pressure and dryness fraction
Pressure alone

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Steam Boilers, Engines, Nozzles and Turbines
The crown of the fire box is made hemispherical in order to

Give maximum strength
Withstand pressure inside boiler
Resist intense heat in fire box
Give maximum space

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Steam Boilers, Engines, Nozzles and Turbines
A device used to increase the temperature of saturated steam without raising its pressure, is called

Superheater
Stop valve
Fusible plug
Blow off cock

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