Digital Arithmetic Operations and Circuits problems
- 1. What logic function is the sum output of a half-adder?
Options- A. AND
- B. exclusive-OR
- C. exclusive-NOR
- D. NAND Discuss
Correct Answer: exclusive-OR
- 2. Solve this binary problem: 01110010 ? 01001000 =
Options- A. 00011010
- B. 00101010
- C. 01110010
- D. 00111100 Discuss
Correct Answer: 00101010
- 3. Solving ?11 + (?2) will yield which two's-complement answer?
Options- A. 1110 1101
- B. 1111 1001
- C. 1111 0011
- D. 1110 1001 Discuss
Correct Answer: 1111 0011
- 4. Perform subtraction on each of the following binary numbers by taking the two's-complement of the number being subtracted and then adding it to the first number.
01001 01100
00011 00111
Options- A. 01100 10011
- B. 00110 00101
- C. 10110 10101
- D. 00111 00100 Discuss
Correct Answer: 00110 00101
- 5. Which of the following is the primary advantage of using binary-coded decimal (BCD) instead of straight binary coding?
Options- A. Fewer bits are required to represent a decimal number with the BCD code.
- B. BCD codes are easily converted from decimal.
- C. the relative ease of converting to and from decimal
- D. BCD codes are easily converted to straight binary codes. Discuss
Correct Answer: the relative ease of converting to and from decimal
- 6. A half-adder circuit would normally be used each time a carry input is required in an added circuit.
Options- A. True
- B. False Discuss
Correct Answer: False
- 7. Fast-look-ahead carry circuits found in most 4-bit full-adder circuits:
Options- A. determine sign and magnitude
- B. reduce propagation delay
- C. add a 1 to complemented inputs
- D. increase ripple delay Discuss
Correct Answer: reduce propagation delay
- 8. Solve the following:
Options- A. 10011110
- B. 01211110
- C. 000100000100
- D. 001000001000 Discuss
Correct Answer: 000100000100
- 9. Solve this binary problem: 01000110 ÷ 00001010 =
Options- A. 0111
- B. 10011
- C. 1001
- D. 0011 Discuss
Correct Answer: 0111
- 10. One way to make a four-bit adder perform subtraction is by:
Options- A. inverting the output.
- B. inverting the carry-in.
- C. inverting the B inputs.
- D. grounding the B inputs. Discuss
Correct Answer: inverting the B inputs.
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