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     EduGorilla 
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    For a 3-phase, 4-pole, 50 Hz synchronous motor, the frequency, pole number and the load torque are all halved. The motor speed will be

    Options :-

    1. 1500 r.p.m.
    2. 3000 r.p.m.
    3. 375 r.p.m.
    4. 75 r.p.m.
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