Electrical Machines
A 3-phase, alternator has generated emf per phase of 230 V with 10% 3rd harmonic and 6% 5th harmonic content. Calculate rms line voltage for star connection.

 50 V.
  230.2 V.
 399 V.
 100 V.

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Electrical Machines
When the supply terminal of a DC shunt motor are interchanged

 The direction of rotation will reverse.
 The motor will stop.
 The motor will run much faster in the same direction.
  The motor will run at its normal speed in the same direction as before.

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