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Digital Arithmetic Operations and Circuits problems

  • 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. 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
  • 3. Which of the statements below best describes the given figure?

    Digital Electronics Digital Arithmetic Operations and Circuits: 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
  • 4. How many BCD adders would be required to add the numbers 97310 + 3910?

  • Options
  • A. 3
  • B. 4
  • C. 5
  • D. 6
    • Also asked in: Bank Exams

    • Discuss
  • 5. 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
  • 6. The binary adder circuit is designed to add ________ binary numbers at the same time.

  • Options
  • A. 2
  • B. 4
  • C. 6
  • D. 8
    • Discuss
  • 7. What is wrong, if anything, with the circuit in the given figure based on the logic analyzer display accompanying the circuit?

    Digital Electronics Digital Arithmetic Operations and Circuits: What is wrong, if anything, with the circuit in the given figure based on the logic analyzer display


  • 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
  • 8. Half-adders can be combined to form a full-adder with no additional gates.

  • Options
  • A. True
  • B. False
    • Discuss
  • 9. The decimal value for E16 is:

  • Options
  • A. 1210
  • B. 1310
  • C. 1410
  • D. 1510
    • Discuss
  • 10. 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
    • Discuss

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