The two inputs of a CRO are fed with two stationary periodic signals. In the X-Y mode, the screen shows a

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 

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
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Answer :

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 The signals are sinusoidal with their frequencies very close but not equal 

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