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Home ‣ Digital Electronics ‣ Digital Arithmetic Operations and Circuits Comments
  • Question

  • 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.

  • Correct Answer
  • It is faster than a ripple-carry adder. 

    • Digital Arithmetic Operations and Circuits problems

    Search Results

    • 1. 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
    • 2. 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
    • 3. 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
      • Discuss
    • 4. 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
    • 5. Find the 2's complement of ?1101102.

    • Options
    • A. 1101002
    • B. 1010102
    • C. 0010012
    • D. 0010102
      • Discuss
    • 6. 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
    • 7. How many BCD adders would be required to add the numbers 97310 + 3910?

    • Options
    • A. 3
    • B. 4
    • C. 5
    • D. 6
      • Discuss
    • 8. An input to the mode pin of an arithmetic/logic unit (ALU) determines if the function will be:

    • Options
    • A. one's-complemented
    • B. arithmetic or logic
    • C. positive or negative
    • D. with or without carry
      • Discuss
    • 9. The binary adder circuit is designed to add ________ binary numbers at the same time.

    • Options
    • A. 2
    • B. 4
    • C. 6
    • D. 8
      • Discuss
    • 10. 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 Vcc.
    • C. The P1 input is not being added into the total.
    • D. Nothing is wrong; the circuit is functioning correctly.
      • Discuss

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