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Digital Arithmetic Operations and Circuits - Technical MCQs

Q1:

For a 4-bit parallel adder, if the carry-in is connected to a logical HIGH, the result is:

A the same as if the carry-in is tied LOW since the least significant carry-in is ignored.

B that carry-out will always be HIGH.

C a one will be added to the final result.

D the carry-out is ignored.

ANS:C - a one will be added to the final result.

For Example, consider two 4-bit Numbers: A = 1100 and B = 1000; Cin =1 (as given).

Add A & B.
1100
1000
-------
10100

Now Cin added to the final result.
10100
-----1
--------
10101.

Hence, option C is correct.