In squirrel cage induction motors which of the following methods of starting cannot be used ?
Correct answer: A. Resistance in rotor circuit
- A. Resistance in rotor circuit
- B. Resistance in stator circuit
- C. Auto-transformer starting
- D. Star-delta starting
Explanation
A squirrel-cage rotor has no accessible external circuit, so resistance cannot be inserted directly into its rotor circuit. Stator resistance, autotransformer, and star-delta methods can reduce the applied starting voltage.
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