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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
Size of boiler tubes is specified by

Outside diameter and inside diameter
Mean diameter and thickness
Outside diameter and thickness
Inside diameter and thickness

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Steam Boilers, Engines, Nozzles and Turbines
The heat loss in a boiler takes place in the form of

Heat carried away by ash
All of these
Heat carried away by flue gases
Moisture present in fuel and steam formed by combustion of hydrogen in fuel

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Steam Boilers, Engines, Nozzles and Turbines
The velocity of steam leaving the nozzle (V) is given by (where K = Nozzle coefficient or nozzle efficiency, and hd = Enthalpy or heat drop during expansion of steam in a nozzle)

V = 44.72 K hd
V = 44.72 K hd
V = 44.72 hd K
V = 44.72 K hd

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Steam Boilers, Engines, Nozzles and Turbines
The diameter of tubes for natural circulation boiler as compared to controlled circulation boilers is

Same
More
Less
Could be more or less depending on other factors

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Steam Boilers, Engines, Nozzles and Turbines
Which type of boiler can meet rapid changes of load?

Vertical fire tube type
Forced circulation type
Horizontal water tube type
Horizontal fire tube type

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Steam Boilers, Engines, Nozzles and Turbines
Latent heat of dry steam at atmospheric pressure is equal to

539 kcal/ kg
539 BTU/ lb
427 kcal/ kg
100 kcal/ kg

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