Load angle for a synchronous motor

Q.  A synchronous motor is running at a load angle of 25 degree at rated frequency with negligible armature resistance. Now, if the supply frequency is increased by 15% keeping the other parameters constant, then the new load angle will be equal to
- Published on 29 Oct 15

a. 26.89 degree
b. 29.07 degree
c. 32.05 degree
d. 38.20 degree

ANSWER: 29.07 degree

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