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electronics and communication engineering measurements and instrumentation
1. Both X and Y plates of a CRO are excited by ac signals. The display is an ellipse which makes one rotation in 5 seconds. This means that
(A): either (a) or (c)
(B): the difference between the frequencies of the two signals is 5 Hz
(C): the difference between the frequencies of the two signals is one fifth of hertz
(D): the frequency of one input is 5 times that of other
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