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     EduGorilla 
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    A 220 V D.C. shunt motor runs at 500 rpm when the armature current is 50 A.

    The armature resistance of the motor is 0.2. If the torque is doubled, the speed of the motor will be

    Options :-

    1. 476 rpm
    2. 479 rpm
    3. 454 rpm
    4. unchanged
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