The startor of a 415 V, 50 Hz, 6-pole, 970 rpm, 3-phase slip-ring induction motor is fed with normal voltage. The rotor with slip rings opencircuited is rotated at 500 rpm along the normal direction of it s rotation. The frequency of the voltage across slip rings will be _______ HZ.

The startor of a 415 V, 50 Hz, 6-pole, 970 rpm, 3-phase slip-ring indu

1.	The startor of a 415 V, 50 Hz, 6-pole, 970 rpm, 3-phase slip-ring induction motor is fed with normal voltage. The rotor with slip rings opencircuited is rotated at 500 rpm along the normal direction of it s rotation. The frequency of the voltage across slip rings will be _______ HZ.
A.	5 Hz
B.	25 Hz
C.	21 Hz
D.	45 Hz
Answer» C. 21 Hz

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The startor of a 415 V, 50 Hz, 6-pole, 970 rpm, 3-phase slip-ring induction motor is fed with normal voltage. The rotor with slip rings opencircuited is rotated at 500 rpm along the normal direction of it s rotation. The frequency of the voltage across slip rings will be _______ HZ.

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