Measurement and Instrumentation
A Lissajous pattern on an oscilloscope has 5 horinzontal tangencies and 2 vertical tangencies. The frequency of horizontal input is 100 Hz. The frequency of the vertical will be

 400 Hz.
 500 Hz.
 625 Hz.
 250 Hz.

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Measurement and Instrumentation
Which of following statement are correct in case of power factor meter?

 The restoring torque is provided by a controlling torque.
 It consist of two coils mounted at right angles to each other.
 The deflection is proportional to phase angle between field coil and crossed coil.
 Both B and C.

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