A 50 HP , 440 Volt , 3 - phase , 50 Hz Induction motor with star - connected stator winding gave the following test results : ( i ) No load test : Applied line voltage 440 V , line current 24 A , wattmeter reading 5150 and 3350 watts. ( ii ) Blocked rotor test : applied line voltage 33.6 volt , line current 65 A , wattmeter reading 2150 and 766 watts . Calculate the parameters of the equivalent circuit .

2. A 250 kVA, 480 V, 50 Hz, delta-connected alternator with a rated field current of 5 A was tested and the following test data were obtained: • Open circuit terminal voltage from OC test data is 540 V at the rated IF. • Short circuit current from SC test data is 300 A at the rated IF. • A dc current of 20A is flowing through any two stator armature terminals, when a DC voltage of 10 V was applied to two of the terminals. Evaluate the following from above tests data the armature resistance, the approximate synchronous reactance and voltage regulation at rated load and 0.7 pf lead.

A 3-phase 8-pole induction motor is connected to a 3-phase system with line-to-line voltage of 400V (peak) and frequency of 60HZ. Stator resistor is 0.72 and total stator copper loss is 840W. Iron loss is 400W and friction loss is 133W. Motor is rotating at 888rpm. Input power factor is 95% lagging. Determine: (i) Input power (ii) Output mechanical power and efficiency