Electrical Machines
With the increases in field excitation of a DC generator, its generated emf

 increases.
  decreases.
  increases upto a limit and then remains almost constant.
  remains constant.

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Electrical Machines
No load primary current in a transformer

 leads the applied voltage somewhat less than 90Ã&
 lags behind applied voltage by exactly 90Â&am
 lags behind applied voltage somewhat less than 90Ã
 leads the applied voltage by exactly 90Â&

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