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MEO Class II – MET : 2011/NOV/06 – 2012/NOV/06 – 2014/OCT/06 – 2014/AUG/06 – 2016/DEC/06 – 2022/OCT/06 – 2023/MAR/06
Question
Q6. A. Describe the effect of the following loads on power factor: -
(i) Induction motors; (ii) Transformers; (iii) Partly loaded motors; (iv) Cage type motors.
B. In a 50-Kav, star-connected, 440-V, 3-phase, 50-Hz alternator, the effective armature resistance is 0.25 ohm per phase. The synchronous reactance is 3.2 ohm per phase and leakage reactance is 0.5 ohm phase. Determine at rated load and unity power factor:
(a) Internal e.m.f Ea (b) no-load e.m.f E0 (c) percentage regulation on full-load (d) value of synchronous reactance which replaces armature reaction.
Asked in Year/Month/Ques No.