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- Question
Why is a fast-look-ahead carry circuit used in the 7483 4-bit full-adder?
Options- A. to decrease the cost
- B. to make it smaller
- C. to slow down the circuit
- D. to speed up the circuit
- Correct Answer
- to speed up the circuit
- 1. The carry propagation delay in full-adder circuits:
Options- A. is normally not a consideration because the delays are usually in the nanosecond range.
- B. decreases in a direct ratio to the total number of FA stages.
- C. is cumulative for each stage and limits the speed at which arithmetic operations are performed.
- D. increases in a direct ratio to the total number of FA stages but is not a factor in limiting the speed of arithmetic operations. Discuss
- 2. Find the 2's complement of ?1101102.
Options- A. 1101002
- B. 1010102
- C. 0010012
- D. 0010102 Discuss
- 3. The 2's-complement system is to be used to add the signed binary numbers 11110010 and 11110011. Determine, in decimal, the sign and value of each number and their sum.
Options- A. ?113 and ?114, ?227
- B. ?14 and ?13, ?27
- C. ?11 and ?16, ?27
- D. ?27 and ?13, ?40 Discuss
- 4. Subtract the following binary numbers.
0101 1000 1010 0011 1101 1110 ?0010 0011 ?0011 1000 ?0101 0111
Options- A. 0011 0100 0110 1010 1000 0110
- B. 0011 0101 0110 1011 1000 0111
- C. 0011 0101 0110 1010 1000 0111
- D. 0011 0101 0110 1010 1000 0110 Discuss
- 5. Convert each of the following signed binary numbers (two's-complement) to a signed decimal number.
00000101 11111100 11111000
Options- A. ?5 +4 +8
- B. +5 ?4 ?8
- C. ?5 +252 +248
- D. +5 ?252 ?248 Discuss
- 6. Convert each of the signed decimal numbers to an 8-bit signed binary number (two's-complement).
+7 ?3 ?12
Options- A. 0000 0111 1111 1101 1111 0100
- B. 1000 0111 0111 1101 0111 0100
- C. 0000 0111 0000 0011 0000 1100
- D. 0000 0111 1000 0011 1000 1100 Discuss
- 7. What are constants in VHDL code?
Options- A. Fixed numbers represented by a name
- B. Fixed variables used in functions
- C. Fixed number types
- D. Constants do not exist in VHDL code. Discuss
- 8. What distinguishes the look-ahead-carry adder?
Options- A. It is slower than the ripple-carry adder.
- B. It is easier to implement logically than a full adder.
- C. It is faster than a ripple-carry adder.
- D. It requires advance knowledge of the final answer. Discuss
- 9. Which of the statements below best describes the given figure?
Options- A. Half-carry adder; Sum = 0, Carry = 1
- B. Half-carry adder; Sum = 1, Carry = 0
- C. Full-carry adder; Sum = 1, Carry = 0
- D. Full-carry adder; Sum = 1, Carry = 1 Discuss
- 10. How many BCD adders would be required to add the numbers 97310 + 3910?
Options- A. 3
- B. 4
- C. 5
- D. 6 Discuss
Digital Arithmetic Operations and Circuits problems
Search Results
Correct Answer: is cumulative for each stage and limits the speed at which arithmetic operations are performed.
Correct Answer: 0010102
Correct Answer: ?14 and ?13, ?27
Correct Answer: 0011 0101 0110 1011 1000 0111
Correct Answer: +5 ?4 ?8
Correct Answer: 0000 0111 1111 1101 1111 0100
Correct Answer: Fixed numbers represented by a name
Correct Answer: It is faster than a ripple-carry adder.
Correct Answer: Half-carry adder; Sum = 0, Carry = 1
Correct Answer: 3
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