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The two inputs of a CRO are fed with two stationary periodic signals. The figure changes from ellipse to circle and back to ellipse with its major axis changing orientation slowly and repeatedly. The following inference can be made from this.

The two inputs of a CRO are fed with two stationary periodic signals. The figure changes from ellipse to circle and back to ellipse with its major axis changing orientation slowly and repeatedly. The following inference can be made from this. Correct Answer There is a constant but small phase difference between the signals

X = A sinωt Y = A sin (ωt-∅t) Phase difference = ∅t For ellipse, A1 ≠ A2 For circle, A1 = A2 Hence, there is a constant but small difference between the signals.

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