Question

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.

the frequency of one input is 5 times that of other

b.

the difference between the frequencies of the two signals is one fifth of hertz

c.

the difference between the frequencies of the two signals is 5 Hz

d.

either (a) or (c)

Answer: (b).the difference between the frequencies of the two signals is one fifth of hertz

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Q. 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

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