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1. |
The two inputs of a CRO are fed with two stationary periodic signals. In the X-Y mode, the screen shows a figure which 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. [GATE2009] |
A. | The signals are not sinusoidal |
B. | The amplitudes of the signals are very close but not equal |
C. | The signals are sinusoidal with their frequencies very close but not equal |
D. | There is a constant but small phase difference between the signals |
Answer» E. | |