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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
The diameter of flue tube in a Cornish boiler is _________ that of the shell.

Two-fifth
Three-fifth
One-third
One-fourth

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Steam Boilers, Engines, Nozzles and Turbines
The high steam and low water safety valve is used to blow off steam when the

None of these
Water level in the boiler becomes too low
Steam pressure exceeds the working pressure
Both (A) and (B)

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

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

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Steam Boilers, Engines, Nozzles and Turbines
Gradually increasing temperature of flue gases at inlet to chimney for given steam outputs is an indication of

Raising of steam temperature
Fouling of heat transfer surfaces
High calorific value coal being burnt
Higher effectiveness of boiler

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Steam Boilers, Engines, Nozzles and Turbines
Blading efficiency is also known as

Nozzle efficiency
Diagram efficiency
Stage efficiency
None of these

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Steam Boilers, Engines, Nozzles and Turbines
The flow of steam is supersonic

At the entrance to the nozzle
In the divergent portion of the nozzle
At the throat of the nozzle
In the convergent portion of the nozzle

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