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    A 4 pole, 50 Hz IM operates at 7% slip. The frequency of EMF induced in the rotor will be ________.
    Question

    A 4 pole, 50 Hz IM operates at 7% slip. The frequency of EMF induced in the rotor will be ________.

    A.

    0.5 Hz

    B.

    3.5 Hz

    C.

    1.5 Hz

    D.

    2.5 Hz

    Correct option is B

    Given: Slip s=7%=0.07 Supply frequency fs=50 HzThe frequency of the EMF induced in the rotor is given by:fr=s×fsfr=7100×50=3.5 Hz\text{Given:} \\[4pt]\bullet \; \text{Slip } s = 7\% = 0.07 \\[4pt]\bullet \; \text{Supply frequency } f_s = 50\,\text{Hz} \\[8pt]\text{The frequency of the EMF induced in the rotor is given by:} \\[4pt]f_r = s \times f_s \\[6pt]f_r = \frac{7}{100} \times 50 = 3.5\,\text{Hz}​​

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