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 draug

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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