An overloaded fan-cooled induction motor has copper losses of 4 kW and iron losses of 2.5 kW. The motor cooling system d

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An Overloaded Fan Cooled Induction Motor Has Copper Losses Of 4 Kw And Iron Losses Of 2 5 Kw The Motor Cooling System D 1 (23.06 KiB) Viewed 22 times

An overloaded fan-cooled induction motor has copper losses of 4 kW and iron losses of 2.5 kW. The motor cooling system dissipates heat at a rate of 3.5 kW. Q49. Determine the net heat increase (MJ) of the motor if it is run on overload for 1.25 hours. (a) 11.25 MJ (b) 13.50 MJ (c) 15.75 MJ (d) 18.00 MJ (e) 29.25 MJ Q50. Calculate the operating temperature of the motor after 1.25 hours, if the motor initial operating temperature is 30 °C. The motor has a mass of 500 kg and the average specific heat capacity of the motor is 400 J/(kg*C). (a) 37.5°C (b) 48.75 °C (c) 84.0°C (d) 97.5 °C (e) 176.25 °C