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

  • What is the major difference between half-adders and full-adders?


  • Options
  • A. Nothing basically; full-adders are made up of two half-adders.
  • B. Full adders can handle double-digit numbers.
  • C. Full adders have a carry input capability.
  • D. Half adders can handle only single-digit numbers.

  • Correct Answer
  • Full adders have a carry input capability. 

    • Digital Arithmetic Operations and Circuits problems

    Search Results

    • 1. How many inputs must a full-adder have?

    • Options
    • A. 4
    • B. 2
    • C. 5
    • D. 3
      • Discuss
    • 2. 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
    • 3. The decimal value for E16 is:

    • Options
    • A. 1210
    • B. 1310
    • C. 1410
    • D. 1510
      • Discuss
    • 4. Half-adders can be combined to form a full-adder with no additional gates.

    • Options
    • A. True
    • B. False
      • Discuss
    • 5. 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
    • 6. The most commonly used system for representing signed binary numbers is the:

    • Options
    • A. 2's-complement system.
    • B. 1's-complement system.
    • C. 10's-complement system.
    • D. sign-magnitude system.
      • Discuss
    • 7. When performing subtraction by addition in the 2's-complement system:

    • Options
    • A. the minuend and the subtrahend are both changed to the 2's-complement.
    • B. the minuend is changed to 2's-complement and the subtrahend is left in its original form.
    • C. the minuend is left in its original form and the subtrahend is changed to its 2's-complement.
    • D. the minuend and subtrahend are both left in their original form.
      • Discuss
    • 8. A full-adder adds ________.

    • Options
    • A. two single bits and one carry bit
    • B. two 2-bit binary numbers
    • C. two 4-bit binary numbers
    • D. two 2-bit numbers and one carry bit
      • Discuss
    • 9. Add the following hexadecimal numbers.

      3C   14   3B
      +25   +28   +DC

    • Options
    • A. 60    3C    116
    • B. 62    3C    118
    • C. 61    3C    117
    • D. 61    3D    117
      • Discuss
    • 10. Multiply the following binary numbers.

      1010   1011   1001
      ×0011   ×0111   ×1010

    • Options
    • A. 0001  1110    0100  1101    0101  1011
    • B. 0001  1110    0100  1100    0101  1010
    • C. 0001  1110    0100  1101    0101  1010
    • D. 0001  1101    0100  1101    0101  1010
      • Discuss

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