A motor rated 5 kW runs a forced draught fan. It maintains a constant draught of 50 mm of water. Mass of air supplied per kg of fuel is 18 kg. Determine the efficiency of the fan is the ambient temperature is 27 C and 1500 kg of coal is consumed per hour respectively. (Take V0 = 0.7734 m3)

A motor rated 5 kW runs a forced draught fan. It maintains a constant

1.	A motor rated 5 kW runs a forced draught fan. It maintains a constant draught of 50 mm of water. Mass of air supplied per kg of fuel is 18 kg. Determine the efficiency of the fan is the ambient temperature is 27 C and 1500 kg of coal is consumed per hour respectively. (Take V₀ = 0.7734 m³)
A.	63%
B.	78%
C.	84%
D.	59%
Answer» B. 78%

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A motor rated 5 kW runs a forced draught fan. It maintains a constant draught of 50 mm of water. Mass of air supplied per kg of fuel is 18 kg. Determine the efficiency of the fan is the ambient temperature is 27 C and 1500 kg of coal is consumed per hour respectively. (Take V0 = 0.7734 m3)

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A motor rated 5 kW runs a forced draught fan. It maintains a constant draught of 50 mm of water. Mass of air supplied per kg of fuel is 18 kg. Determine the efficiency of the fan is the ambient temperature is 27 C and 1500 kg of coal is consumed per hour respectively. (Take V₀ = 0.7734 m³)