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The rotor voltage on open circuit between slip rings should not exceed 500 V for small machines.

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The rotor voltage on open circuit between slip rings should not exceed 500 V for small machines.

(a) true

(b) false

I 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

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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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