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The ratio of output power to input power...

The ratio of output power to input power of an elecrtic device is called…….

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The correct Answer is:
effeciency of electric device
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Knowledge Check

  • A viscous clutch as shown in figure tranmits torque. Radius of each clutch plate is R and separation between the plates is a and is completely filled with liquid of coefficient of viscous mu . If omega_(i) and omega_(0) are angular velocities of plates connected to input and output respectively. If efficiency of transmission is ratio of output power to input power, then efficiency is given by

    A
    `1-(omega_(0))/(omega_(i))`
    B
    `(omega_(0))/(omega_(i))`
    C
    `(omega_(0)^(2))/(omega_(i)^(2))`
    D
    `(omega_(0)^(2))/(omega_(i)^(2))`

  • The output power in step-up transformer used in practice is

    A
    greater than the input power
    B
    equal to the input power
    C
    less than the input power
    D
    None of these

  • For an ideal transformer ratio of output ot the input power is always

    A
    greater than one
    B
    equal ot one
    C
    less than one
    D
    zero

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