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The boiler efficiency is given by (where m = Total mass of water evaporated into steam in kg/h, m_f = Mass of fuel in kg/h, C = Calorific valve of fuel in kJ/kg of fuel, h = Total heat of steam in kJ/kg, and h_f1 = Sensible heat of feed water in kJ /kg)

Options:

A . `(m_f .C)/(m_s (h - h_(f1)))`

B . `(m_f .C)/(m_s (h + h_(f1)))`

C . `(m_s (h - h_(f1)))/(m_f .C)`

D . `(m_s (h + h_(f1)))/(m_f .C)`

Answer: Option C

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