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Ques:-

Control field of microinstruction contain two groups of control signal group 1 supports none or one of 64 control signals and group 2 supports at most 6 from remaining. What is size of micro operation?

(what is the meaning of "from remaining" here?)
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One or none = vertical miP = 6 bit
atmost n require horizontal miP = 6 bit
so total 12 bit.
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It means that there are total 64 control signals available in the Control Unit, and there are two groups considered here. One group will have either none or one control signal from the given 64 signals. The other group can have at most 6 control signals from the remaining 63 signals, if the previous group used one signal, or from 64 signals, if the previous group didn't use any signal.

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