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At overloads, magnetic shunt ________(a) aids the series flux(b) diverts series flux(c) maintains zero flux(d) disables the shunt fluxThis question was posed to me during an online interview.Question is from Lag Adjustment Devices in section Measurement of Power and Related Parameters of Electrical Measurements

Answer»

Correct choice is (b) diverts series flux

For explanation I would say: As the magnetic SHUNT reaches saturation at OVERLOADS, magnetic shunt diverts the flux due to series MAGNET. As a result a large portion of the flux appears in the gap of the air disc. This compensates the SELF BRAKING torque.



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