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1H-QUESTION 1 (25 Marks)-2014 A 2 hp, 120 V, 60 Hz, 4-Pole, three-phase, Y-connected synchronous motor has armature resistance and synchronous reactance of 0.2 Î© and 10 Î©, respectively (1 hp = 746 W). The rotational loss, core loss, and field winding loss are 35 W, 20 W, and 30 W, respectively. It is operating at full-load with unity power factor. Determine: a) Armature current Ia (magnitude and phase angle). (10 Marks) b) Input power Pin and efficiency n (in percentage). (8 Marks) c) Excitation voltage Ex (magnitude and phase angle) and power angle Î¸. (7 Marks) Solution: Ia = 7.61 A, Z0 = 1611.75 W, n = 92.6%, Ef = 102 V, Î¸ = -48.32.

          1H-QUESTION 1 (25 Marks)-2014
    A 2 hp, 120 V, 60 Hz, 4-Pole, three-phase, Y-connected synchronous motor has armature resistance and synchronous reactance of 0.2 Î© and 10 Î©, respectively (1 hp = 746 W). The rotational loss, core loss, and field winding loss are 35 W, 20 W, and 30 W, respectively. It is operating at full-load with unity power factor. Determine:
    a) Armature current Ia (magnitude and phase angle). (10 Marks)
    b) Input power Pin and efficiency n (in percentage). (8 Marks)
    c) Excitation voltage Ex (magnitude and phase angle) and power angle Î¸. (7 Marks)
    Solution: Ia = 7.61 A, Z0 = 1611.75 W, n = 92.6%, Ef = 102 V, Î¸ = -48.32.

1h ouestion 1 25 marks 2014 a 2 hp 120 v 60 hz 4 pole three phase y connected synchronous motor has armature resistance and synchronous reactance of 02 q and 10 q respectively 1 hp 746 w the 36396

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