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  • Question

  • A carry look ahead adder is frequently used for addition because


  • Options
  • A. it costs less
  • B. it is faster
  • C. it is more accurate
  • D. is uses fewer gates

  • Correct Answer
  • it is faster 

    Explanation
    In look ahead carry adder the carry is directly derived from the gates when original inputs are being added. Hence the addition is fast. This process requires more gates and is costly.

    Digital Electronics problems

    Search Results

    • 1. In the expression A + BC, the total number of minterms will be

    • Options
    • A. 2
    • B. 3
    • C. 4
    • D. 5
      • Discuss
    • 2. Maxterm designation for A + B + C is

    • Options
    • A. M0
    • B. M1
    • C. M3
    • D. M4
      • Discuss
    • 3. A JK flip flop has tpd= 12 ns. The largest modulus of a ripple counter using these flip flops and operating at 10 MHz is

    • Options
    • A. 16
    • B. 64
    • C. 128
    • D. 256
      • Discuss
    • 4. The output of a half adder is

    • Options
    • A. SUM
    • B. CARRY
    • C. SUM and CARRY
    • D. none of the above
      • Discuss
    • 5. The fixed count that should be used so that the output register will represent the input for a 6 bit dual slope A/D converter uses a reference of -6v and a 1 MHz clock. It uses a fixed count of 40 (101000).

    • Options
    • A. 000110
    • B. 0010
    • C. 1111
    • D. 011101
      • Discuss
    • 6. A decade counter skips

    • Options
    • A. binary states 1000 to 1111
    • B. binary states 0000 to 0011
    • C. binary states 1010 to 1111
    • D. binary states 1111 to higher
      • Discuss
    • 7. Minimum number of 2-input NAND gates required to implement the function F = (x + y) (Z + W) is

    • Options
    • A. 3
    • B. 4
    • C. 5
    • D. 6
      • Discuss
    • 8. The basic storage element in a digital system is

    • Options
    • A. flip flop
    • B. counter
    • C. multiplexer
    • D. encoder
      • Discuss
    • 9. A counter type A/D converter contains a 4 bit binary ladder and a counter driven by a 2 MHz clock. Then conversion time

    • Options
    • A. 8 ? sec
    • B. 10 ? sec
    • C. 2 ? sec
    • D. 5 ? sec
      • Discuss
    • 10. Decimal 43 in hexadecimal and BCD number system is respectively.

    • Options
    • A. B2, 01000011
    • B. 2B, 01000011
    • C. 2B, 00110100
    • D. B2, 01000100
      • Discuss

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