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Combinational Logic Circuits - Technical MCQs

Q1:

Two 4-bit binary numbers (1011 and 1111) are applied to a 4-bit parallel adder. The carry input is 1. What are the values for the sum and carry output?

A 4321 = 0111, Cout = 0

B 4321 = 1111, Cout = 1

C 4321 = 1011, Cout = 1

D 4321 = 1100, Cout = 1

ANS:C - 4321 = 1011, Cout = 1

---1 <- Previous Carry
1011
1111
-------
1 1011 <- Cout is 1 and result is 1011.

@Narendra, @Anjana, @Biswajit.

Consider the carry input given in the question.