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Home Digital Electronics Digital Arithmetic Operations and Circuits Comments

  • Question
  • 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

  • Correct Answer
  • arithmetic or logic 


  • Digital Arithmetic Operations and Circuits problems


    Search Results


    • 1. How many BCD adders would be required to add the numbers 97310 + 3910?

    • Options
    • A. 3
    • B. 4
    • C. 5
    • D. 6
    • Discuss
    • 2. 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
    • 3. 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
    • 4. 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
    • 5. 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
    • 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?


    • 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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