Digital Logic

Combinational Circuits Logic functions & Minimization Number representation and computer arithmetic Sequential Circuits

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Digital Logic - Combinational Circuits

21:

A demultiplexer is used to

A.	Route the data from single input to one of many outputs
B.	Perform serial to parallel conversion
C.	Both (a) & (b)
D.	Select data from several inputs and route it to single output
	Answer Report Discuss
	Option: C Explanation : In demultiplexer, inputs is inserted serially and then it gives multiple outputs which are in parallel form. Click on Discuss to view users comments. nidhi said: (1:00pm on Saturday 18th July 2015) its d select data from several inputs and route it to singal output Write your comments here: Updating your Comments.. Updating your Comments..

22: An OR gate can be imagined as

A.	Switches connected in series
B.	Switches connected in parallel
C.	MOS transistors connected in series
D.	None of these
	Answer Report Discuss
	Option: B Explanation : Click on Discuss to view users comments. Write your comments here: Updating your Comments.. Updating your Comments..

23: Which combination of gates does not allow the implementation of an arbitrary boolean function?

A.	OR gates and AND gates only
B.	OR gates and exclusive OR gate only
C.	OR gates and NOT gates only
D.	NAND gates only
	Answer Report Discuss
	Option: A Explanation : Click on Discuss to view users comments. Write your comments here: Updating your Comments.. Updating your Comments..

24:

How many full adders are required to construct an m-bit parallel adder ?

A.	m/2
B.	m-1
C.	m
D.	m+1
	Answer Report Discuss
	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 parllel adder. Click on Discuss to view users comments. Write your comments here: Updating your Comments.. Updating your Comments..

25: Parallel adders are

A.	combinational logic circuits
B.	sequential logic circuits
C.	both (a) and (b)
D.	None of these
	Answer Report Discuss
	Option: A Explanation : Click on Discuss to view users comments. Write your comments here: Updating your Comments.. Updating your Comments..

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