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Calculate the extinction angle in purely inductive load if the firing angle is π÷4.

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Calculate the extinction angle in purely inductive load if the firing angle is π÷4.

(a) 315°

(b) 145°

(c) 345°

(d) 285°

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This key question is from Solid State Controlled Drives topic in chapter Introduction to Solid State Controlled Drives of Electric Drives

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Correct choice is (a) 315°

Explanation: The extinction angle in the purely inductive load is 2π-∝=360°-45°=315°. 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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