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In the rotor voltage injection method, when an external voltage source is in opposite phase with the main voltage then speed will ___________

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In the rotor voltage injection method, when an external voltage source is in opposite phase with the main voltage then speed will ___________

(a) Increase

(b) Decrease

(c) Remain unchanged

(d) First increases then decrease

The question was posed to me by my college director while I was bunking the class.

My query is from Induction Motors Speed Control topic in portion Speed Control of Direct Current Motors & Induction Motors of Electric Drives

1 Answer

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The correct choice is (b) Decrease

Explanation: In the rotor injection method, when an external voltage is in opposite phase with the main voltage net voltage decreases and the value of slip increases and the value of rotor speed decreases.

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