How many inputs must a full-adder have? 2 3 4 5

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3. Convert each of the decimal numbers to 8-bit two's-complement form and then perform subtraction by taking the two's-complement and adding.
Options
A. 0001 0011
B. 0000 1110
C. 0010 1110
D. 1110 0000

4. Which of the following is correct for full adders?
Options
A. Full adders have the capability of directly adding decimal numbers.
B. Full adders are used to make half adders.
C. Full adders are limited to two inputs since there are only two binary digits.
D. In a parallel full adder, the first stage may be a half adder.

5. The carry propagation delay in 4-bit full-adder circuits:
Options
A. is cumulative for each stage and limits the speed at which arithmetic operations are performed
B. is normally not a consideration because the delays are usually in the nanosecond range
C. decreases in direct ratio to the total number of full-adder stages
D. increases in direct ratio to the total number of full-adder stages, but is not a factor in limiting the speed of arithmetic operations

7. What is one disadvantage of the ripple-carry adder?
Options
A. The interconnections are more complex.
B. More stages are required to a full adder.
C. It is slow due to propagation time.
D. All of the above.

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