A motor of power 4 kW is used to drive a forced draught fan. The draught obtained is 45 mm of water. The temperature of the flue gases leaving the boiler is 300°C. The mass of air supplied per kg of fuel is 15 kg. The volume of air at N.T.P. is 0.7734 m3. The coal consumption rate is 1960 kg/hr. Calculate the ambient temperature if the efficiency of the fan is 78%.

A motor of power 4 kW is used to drive a forced draught fan. The drau

1.	A motor of power 4 kW is used to drive a forced draught fan. The draught obtained is 45 mm of water. The temperature of the flue gases leaving the boiler is 300°C. The mass of air supplied per kg of fuel is 15 kg. The volume of air at N.T.P. is 0.7734 m3. The coal consumption rate is 1960 kg/hr. Calculate the ambient temperature if the efficiency of the fan is 78%.
A.	25°C
B.	32°C
C.	27°C
D.	30°C
Answer» C. 27°C

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