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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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