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Of what substance are the brushes of an ...

Of what substance are the brushes of an electric motor made ?

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Knowledge Check

  • Work of electric motor is

    A
    To convert ac into dc
    B
    To convert dc into ac
    C
    Both (a) and (b)
    D
    To convert ac into mechanical work

  • An electric motor converts

    A
    Mechanincal energy into electrical energy
    B
    Thermal energy into electrical energy.
    C
    Electrical energy into mechanical energy
    D
    Radiant energy into electrical energy.

  • An electric motor converts

    A
    mechanical energy into electrical energy.
    B
    electrical energy into sound energy
    C
    electrical energy into mechanical energy
    D
    mechanical energy into sound energy.

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