Computer System Architecture - Digital Logic Circuits - Combinational Circuits
21. A demultiplexer is used to
- Option : C
- Explanation : In demultiplexer, inputs is inserted serially and then it gives multiple outputs which are in parallel form.
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22. An OR gate can be imagined as
- Option : B
- Explanation :
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23. Which combination of gates does not allow the implementation of an arbitrary boolean function?
- Option : A
- Explanation :
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24. How many full adders are required to construct an m-bit parallel adder ?
- Option : B
- Explanation : We need an adder for every bit. So we should need m full adders. A full adder adds a carry bit to two inputs and produces an output and a carry. But the most significant bits can use a half adder, which differs from the full adder as in that it has no carry input, so we need m-1 full adders in m bit parallel adder.
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- Option : A
- Explanation :
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