Question

Frequency of oscillation in an electronic energy meter depends on __________

(a) output current of multiplier

(b) output voltage of multiplier

(c) output power of multiplier

(d) input resistance of multiplier

This question was posed to me in an international level competition.

This is a very interesting question from Electronic Energy Meter, Adjustments in Single Phase Energy meters in section Measurement of Power and Related Parameters of Electrical Measurements

Answer 1

Correct answer is (a) output current of multiplier

The explanation is: Oscillator used in an energy meter generates a square wave. The frequency of the this depends on the output current flowing through the multiplier.