When the excitation voltage is increased from 1 to 1.3 pu of a 3-phase synchronous motor. Then load angle for the constant power operation ________(a) must be decreased(b) can also be increased(c) increased(d) decreasedI have been asked this question by my college professor while I was bunking the class.I'm obligated to ask this question of Power Factor Correction by Synchronous Motors topic in section Synchronous Motors of Electrical Machines

When the excitation voltage is increased from 1 to 1.3 pu of a 3-phase

1.	When the excitation voltage is increased from 1 to 1.3 pu of a 3-phase synchronous motor. Then load angle for the constant power operation ________(a) must be decreased(b) can also be increased(c) increased(d) decreasedI have been asked this question by my college professor while I was bunking the class.I'm obligated to ask this question of Power Factor Correction by Synchronous Motors topic in section Synchronous Motors of Electrical Machines
Answer» The correct ANSWER is (a) must be decreased To elaborate: ‘Ef*sinδ’ is to be maintained constant. so if EXCITATION voltage INCREASES then the load angle must decrease.

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