GATE EE 2014 Set 3 — Question 30
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Electrical & Electronic Measurements → Electronic & Digital Instruments → Lissajous Figures
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Question
The two signals and , shown in figure, are applied to and deflection plates of an oscilloscope.
The waveform displayed on the screen is
Correct answer
(A) [figure]
Solution
(triangular wave) drives the plates and (square wave) drives the plates, so the spot is at .
- For : , while rises from to (at ) and falls back to (at ). The spot moves up and down along the vertical segment , .
- For : , while falls from to (at ) and returns to (at ). The spot traces the vertical segment , .
- At the switching instants and , jumps between and while , so the spot crosses along the -axis () between and , drawing the horizontal segment.
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