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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
The ratio of heat utilized to produce steam and the heat liberated in furnace is known as

Boiler evaporative capacity
Boiler efficiency
Factor of evaporation
Boiler effectiveness

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Steam Boilers, Engines, Nozzles and Turbines
The fire tubes in a Scotch marine boiler are

None of the listed here
Inclined
Horizontal
Vertical

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

Gross efficiency
Nozzle efficiency
None of these
Diagram efficiency

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Steam Boilers, Engines, Nozzles and Turbines
Fire tube boilers are those in which

Flue gases pass through tubes and water around it
Water passes through the tubes and flue gases around it
Forced circulation takes place
Tubes are laid vertically

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Steam Boilers, Engines, Nozzles and Turbines
A throttle governed steam engine develops 15 kW with 280 kg per hour of steam and 35 kW with 520 kg per hour of steam. The steam consumption in kg per hour when developing 20 kW will be nearly

150 kg/h
280 kg/h
210 kg/h
340 kg/h

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Steam Boilers, Engines, Nozzles and Turbines
Relative percentage of heat absorbed through the heat transfer of (i) Furnace water wall (ii) Boiler tank (iii) Superheater (iv) Economizer (v) Air-heater of a typical boiler of 200 MW capacity would be of the order of

48 : 20 : 15 : 7 : 10
7 : 15 : 20 : 10 : 48
10 : 7 : 15 : 20 : 48
20 : 48 : 7 : 15 : 10

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