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Home Digital Electronics Digital Arithmetic Operations and Circuits Comments

  • Question
  • One way to make a four-bit adder perform subtraction is by:


  • Options
  • A. inverting the output.
  • B. inverting the carry-in.
  • C. inverting the B inputs.
  • D. grounding the B inputs.

  • Correct Answer
  • inverting the B inputs. 


  • Digital Arithmetic Operations and Circuits problems


    Search Results


    • 1. Solve this binary problem: 01000110 ÷ 00001010 =

    • Options
    • A. 0111
    • B. 10011
    • C. 1001
    • D. 0011
    • Discuss
    • 2. Solve the following:

    • Options
    • A. 10011110
    • B. 01211110
    • C. 000100000100
    • D. 001000001000
    • Discuss
    • 3. Fast-look-ahead carry circuits found in most 4-bit full-adder circuits:

    • Options
    • A. determine sign and magnitude
    • B. reduce propagation delay
    • C. add a 1 to complemented inputs
    • D. increase ripple delay
    • Discuss
    • 4. A half-adder circuit would normally be used each time a carry input is required in an added circuit.

    • Options
    • A. True
    • B. False
    • Discuss
    • 5. Which of the following is the primary advantage of using binary-coded decimal (BCD) instead of straight binary coding?

    • Options
    • A. Fewer bits are required to represent a decimal number with the BCD code.
    • B. BCD codes are easily converted from decimal.
    • C. the relative ease of converting to and from decimal
    • D. BCD codes are easily converted to straight binary codes.
    • Discuss
    • 6. The two's-complement system is to be used to add the signed numbers 11110010 and 11110011. Determine, in decimal, the sign and value of each number and their sum.

    • Options
    • A. ?14 and ?13, ?27
    • B. ?113 and ?114, 227
    • C. ?27 and ?13, 40
    • D. ?11 and ?16, ?27
    • Discuss
    • 7. Solve this BCD problem: 0100 + 0110 =

    • Options
    • A. 00010000BCD
    • B. 00010111BCD
    • C. 00001011BCD
    • D. 00010011BCD
    • Discuss
    • 8. The truth table for a full adder is shown below. What are the values of X, Y, and Z?

    • Options
    • A. X = 0, Y = 1, Z = 1
    • B. X = 1, Y = 1, Z = 1
    • C. X = 1, Y = 0, Z = 1
    • D. X = 0, Y = 0, Z = 1
    • Discuss
    • 9. 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
    • 10. 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


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