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Q10. A three phase, 100-hp, 2400V, 6-pole, 50 Hz induction motor is tested, with the following test results obtained: No-load test (at 50 Hz) Block-rotor test (at 12.5 Hz) 420 35 11500 Signal Voltage (V) 2400 Current (A) 10 Power (W) 4200 Stator resistance is measured at 1.75 Ω per phase. a) Find the parameters of the equivalent circuit b) At a slip of 0.25, calculate the power and torque output and the efficiency of this motor. Ans. : a) RI = 1.75 ohm, XI= 12.36 ohm, Xm-125.54 ohm, X2= 12.36 ohm and R2=1.38 ohm and b) 32.225 kW, 410.3 N.m and 51.1 %

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