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

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Digital Arithmetic Operations and Circuits problems

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1. Convert each of the decimal numbers to two's-complement form and perform the addition in binary.

+13 ?10

add ?7 add +15
Options
A. 0001 0100 0000 0101
B. 0000 0110 0001 1001
C. 0000 0110 0000 0101
D. 1111 0110 1111 0101

4. What is wrong, if anything, with the circuit in the given figure based on the logic analyzer display accompanying the circuit?
Options
A. The CO terminal is shorted to ground.
B. The S1 output is shorted to V_cc.
C. The P1 input is not being added into the total.
D. Nothing is wrong; the circuit is functioning correctly.

6. What is the major difference between half-adders and full-adders?
Options
A. Nothing basically; full-adders are made up of two half-adders.
B. Full adders can handle double-digit numbers.
C. Full adders have a carry input capability.
D. Half adders can handle only single-digit numbers.

7. The most commonly used system for representing signed binary numbers is the:
Options
A. 2's-complement system.
B. 1's-complement system.
C. 10's-complement system.
D. sign-magnitude system.

8. When performing subtraction by addition in the 2's-complement system:
Options
A. the minuend and the subtrahend are both changed to the 2's-complement.
B. the minuend is changed to 2's-complement and the subtrahend is left in its original form.
C. the minuend is left in its original form and the subtrahend is changed to its 2's-complement.
D. the minuend and subtrahend are both left in their original form.

10. Add the following hexadecimal numbers.

3C 14 3B

+25 +28 +DC
Options
A. 60 3C 116
B. 62 3C 118
C. 61 3C 117
D. 61 3D 117

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