Railways Sample Paper RRBs Assistant Loco Pilot and Technician CBT STAGE-I Sample Paper-12

  • question_answer
    Electrical efficiency of a DC motor is equal to which of the following expressions?

    A)  \[\frac{\text{Output}\,\,\text{power-Input}\,\,\text{power}}{\text{Input}\,\,\text{power}}\]

    B)  \[\frac{\text{Input}\,\,\text{power-Copper}\,\,\text{loss}}{\text{Input}\,\,\text{power}}\]

    C)  \[\frac{\text{Input}\,\,\text{power-Total}\,\,\text{losses}}{\text{Input}\,\,\text{power}}\]

    D)  None of the above

    Correct Answer: B

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