5.2 kg/s steam at 1825 kN/m2 pressure, using coal of calorific value 3,000 kcal/kg. The boiler produces 158,400 kg per day. What is the boiler

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A boiler plant raises 5.2 kg/s steam at 1825 kN/m2 pressure, using coal of calorific value 3,000 kcal/kg. The boiler produces 158,400 kg per day. What is the boiler efficiency?

a.45%          b. 60%            c. 75%              d. 83%

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