A boiler produces 4000 kg of dry and saturated steam in 6 hours. In the same time the mass of coal consumed is 300 kg of coal. The mean pressure of steam generated is 11 bar. The temperature of the feed water is 35 C. Determine the boiler efficiency if the calorific value of the fuel is 30000 kJ/kg.

A boiler produces 4000 kg of dry and saturated steam in 6 hours. In th

1.	A boiler produces 4000 kg of dry and saturated steam in 6 hours. In the same time the mass of coal consumed is 300 kg of coal. The mean pressure of steam generated is 11 bar. The temperature of the feed water is 35 C. Determine the boiler efficiency if the calorific value of the fuel is 30000 kJ/kg.
A.	85.64%
B.	75.65%
C.	95.65%
D.	87.78%
Answer» E.

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