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In ac rotating machines, the generated or speed emf 
  • a)
    Iags φ by 900
  • b)
    Ieads φ by 900
  • c)
    is in phase with the working flux φ
  • d)
    Iags φ by 1800
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
In ac rotating machines, the generated or speed emfa)Iags φ by 900...
In ac rotating machines like synchronous generators/motor/induction motors, working flux (φ) leads generated emf by 900. However, in static device like a transformer working flux (φ) lags the applied voltage by 900.
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Most Upvoted Answer
In ac rotating machines, the generated or speed emfa)Iags φ by 900...
In AC rotating machines, the generated or speed EMF (electromotive force) lags the applied voltage by an angle determined by the power factor of the circuit. The power factor is determined by the load connected to the machine and can be either lagging or leading. In a lagging power factor, the generated EMF lags the applied voltage, while in a leading power factor, the generated EMF leads the applied voltage. The phase angle between the generated EMF and the applied voltage is known as the power factor angle.
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