A motor which runs an induced draught fan, maintains a constant draught of 55 mm of water. The efficiency of the fan is 91%. The ambient temperature is 30°C and the temperature of the flue gases leaving the boiler is 330°C. The coal consumption rate is 1850 kg/hr. The volume of air at N.T.P. should be taken as 0.7734 m3. Find the power of the motor if 20 kg of air is required for complete combustion of 1 kg of fuel.

A motor which runs an induced draught fan, maintains a constant draug

1.	A motor which runs an induced draught fan, maintains a constant draught of 55 mm of water. The efficiency of the fan is 91%. The ambient temperature is 30°C and the temperature of the flue gases leaving the boiler is 330°C. The coal consumption rate is 1850 kg/hr. The volume of air at N.T.P. should be taken as 0.7734 m3. Find the power of the motor if 20 kg of air is required for complete combustion of 1 kg of fuel.
A.	4.65 kW
B.	7.69 kW
C.	12.65 kW
D.	10.41 kW
Answer» E.

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