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Railways Sample Paper RRBs Assistant Loco Pilot and Technician CBT STAGE-I Sample Paper-21

  • question_answer
    A device by which the amplitude of an alternating emf is increased or decreased is

    A)  Choke coil        

    B)  Transformer

    C)  Dynamo          

    D)         Electric motor

    Correct Answer: B

    Solution :

    Transformer is a device which can increase or decrease the amplitude of emf. Choke coil allows DC to pass through it but obstruct the path of AC Dynamo converts mechanical energy to electrical energy. Electric motor converts electrical energy to mechanical energy,


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