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    Which of the following is NOT a self–starting motor?
    Question

    Which of the following is NOT a self–starting motor?

    A.

    Three–phase IM

    B.

    DC shunt motor

    C.

    DC series motor

    D.

    One–phase IM

    Correct option is D


    The one-phase induction motor (IM) is not a self-starting motor: 
    Explanation: When a single-phase supply is connected to the stator winding of a single-phase induction motor, it produces a pulsating magnetic field. The rotor does not rotate due to inertia, so the motor is not self-starting. 
    Starting: To make a single-phase induction motor self-starting, it is temporarily converted into a two-phase motor during starting. This is done by adding an extra winding to the stator, called a starting winding. The starting winding and the main winding are placed across the single-phase supply.

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