📊 Electrical Drives and Controls (EDC)
Q. an external voltage source is in phase with the main voltage then speed will
  • (A) increase
  • (B) decrease
  • (C) remain unchanged
  • (D) first increases then decrease
💬 Discuss
✅ Correct Answer: (A) increase

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

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

💬 Discussion

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