Question:medium

A 3-\(\phi\), 50 Hz synchronous motor is to be operated at constant flux by frequency control. If frequency is decreased by 4% of rated frequency at the same flux, then the voltage should be

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Constant flux operation means a direct linear relationship between voltage and frequency (\(V \propto f\)). Because it is a direct linear relationship, any percentage change applied to the frequency requires an identical percentage change in the voltage. - Frequency drops by 4% \(\rightarrow\) Voltage drops by 4%. No complex formulas needed!

Updated On: Jun 25, 2026

\( \text{Decreased by 4%} \)
\( \text{Increased by 4%} \)
\( \text{Decreased by 16%} \)
\( \text{Constant} \)

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The Correct Option is A

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