1.

The rotor voltage on open circuit between slip rings should not exceed 500 V for small machines.(a) true(b) falseI got this question in a national level competition.Query is from Design of Wound Rotor topic in section Three Phase Induction Motor of Design of Electrical Machines

Answer»

The CORRECT option is (a) true

Easy explanation: The rotor voltage on open circuit between slip rings should not EXCEED 500 V for the small machines. The voltage is limited to a small VALUE in order to protect persons working the motor if the brush gear is not PERFECTLY protected.



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