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Calculate the extinction angle in purely inductive load if the firing angle is 13°.

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Calculate the extinction angle in purely inductive load if the firing angle is 13°.

(a) 328°

(b) 347°

(c) 349°

(d) 315°

This question was addressed to me in homework.

This interesting question is from Solid-State Switching Circuits topic in section Introduction to Solid-State Switching Circuits of Electric Drives

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Right answer is (b) 347°

Explanation: The extinction angle in the purely inductive load is 2π-∝=360°-13°=347°. The extinction angle is the angle at which current in the circuit becomes zero. The average value of the voltage in a purely inductive load is zero.

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