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An oscilloscope is powered from 230 V mains having a nominal frequency of nearly 50 Hz. The triggering mode of the oscilloscope is set to LINE. A square wave from a function generator is fed to the Y input and a stable display (properly triggered) is obtained when the frequency of the function generator is 297 Hz. The actual frequency of the power supply is

An oscilloscope is powered from 230 V mains having a nominal frequency of nearly 50 Hz. The triggering mode of the oscilloscope is set to LINE. A square wave from a function generator is fed to the Y input and a stable display (properly triggered) is obtained when the frequency of the function generator is 297 Hz. The actual frequency of the power supply is Correct Answer 49.5 Hz

Frequency of the function generator = 297 Hz. If both inputs (X and Y) are sine waves with no phase difference, then we get a line on the screen.

This is possible if YY sine wave frequency is integral multiple of XX sine wave. From the options 49.5 gives integral multiple.

297/49.5 = 6 (integer)

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