Regarding mode of operation of CRO which of following statement is not correct.

Single beam CRO can show alternate and chop mode of operation both.

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For multiple input CRO attenuators and preamplifiers are provided separately.

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The display signal is blanked during flyback period, but not in hold off period, in CRO operation.

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Dual trace CRO is not better option when we are comparing two fast changing transients.

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Solution

The correct option is C The display signal is blanked during flyback period, but not in hold off period, in CRO operation.
The display is blanked during flyback and hold off period as well in CRO operation. Due to
sweep speed much higher than the decay time of CRT phosphor screen shows steady waveform for both channels

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