Normalized carrier frequency for 3 phase VSI SPWM

Q.  In a 3 phase VSI SPWM to use a single carrier signal and preserve the features of PWM technique, the normalized carrier frequency should be
- Published on 08 Sep 15

a. Multiple of two
b. Odd multiple of three
c. Odd multiple of five
d. Odd multiple of seven

ANSWER: Odd multiple of three

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