1.

For eliminating n^th harmonic from the EMF generated in the phase of a 3-phase alternator, the chording angle should be ______________(a) n∗full pitch(b) (1/n)∗full pitch(c) (2/n)∗full pitch(d) (3/n)∗full pitchI have been asked this question during an interview.I'm obligated to ask this question of EMF Polygon topic in chapter Synchronous Machines of Electrical Machines

Answer» RIGHT OPTION is (a) n∗full pitch

Best EXPLANATION: kpn=cosnε/2=0 ⇒ nε/2=90° ⇒ ε=180°/n=full pitch/n.


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