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Combinational Logic Circuits problems

  • 1. Which of the following combinations of logic gates can decode binary 1101?

  • Options
  • A. One 4-input AND gate
  • B. One 4-input AND gate, one OR gate
  • C. One 4-input NAND gate, one inverter
  • D. One 4-input AND gate, one inverter
    • Discuss
  • 2. An output gate is connected to four input gates; the circuit does not function. Preliminary tests with the DMM indicate that the power is applied; scope tests show that the primary input gate has a pulsing signal, while the interconnecting node has no signal. The four load gates are all on different ICs. Which instrument will best help isolate the problem?

  • Options
  • A. Current tracer
  • B. Logic probe
  • C. Oscilloscope
  • D. Logic analyzer
    • Discuss
  • 3. A full-adder has a Cin = 0. What are the sum (∑) and the carry (Cout) when A = 1 and B = 1?

  • Options
  • A. ∑ = 0, Cout = 0
  • B. ∑ = 0, Cout = 1
  • C. ∑ = 1, Cout = 0
  • D. ∑ = 1, Cout = 1
    • Discuss
  • 4. Two 4-bit binary numbers (1011 and 1111) are applied to a 4-bit parallel adder. The carry input is 1. What are the values for the sum and carry output?

  • Options
  • A. ∑4∑3∑2∑1 = 0111, Cout = 0
  • B. ∑4∑3∑2∑1 = 1111, Cout = 1
  • C. ∑4∑3∑2∑1 = 1011, Cout = 1
  • D. ∑4∑3∑2∑1 = 1100, Cout = 1
    • Discuss
  • 5. The device shown here is most likely a ________.

    Digital Electronics Combinational Logic Circuits: The device shown here is most likely a ________.


  • Options
  • A. comparator
  • B. multiplexer
  • C. demultiplexer
  • D. parity generator
    • Discuss
  • 6. Which of the following combinations cannot be combined into K-map groups?

  • Options
  • A. Corners in the same row
  • B. Corners in the same column
  • C. Diagonal corners
  • D. Overlapping combinations
    • Discuss
  • 7. Which of the figures in figure (a to d) is equivalent to figure (e)?

    Digital Electronics Combinational Logic Circuits: Which of the figures in figure (a to d) is equivalent to figure (e)?


  • Options
  • A. a
  • B. b
  • C. c
  • D. d
    • Discuss
  • 8. Which of the figures shown below represents the exclusive-NOR gate?

    Digital Electronics Combinational Logic Circuits: Which of the figures shown below represents the exclusive-NOR gate?


  • Options
  • A. a
  • B. b
  • C. c
  • D. d
    • Also asked in: Bank Exams

    • Discuss
  • 9. How many outputs would two 8-line-to-3-line encoders, expanded to a 16-line-to-4-line encoder, have?

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

    • Discuss
  • 10. Looping on a K-map always results in the elimination of:

  • Options
  • A. variables within the loop that appear only in their complemented form.
  • B. variables that remain unchanged within the loop.
  • C. variables within the loop that appear in both complemented and uncomplemented form.
  • D. variables within the loop that appear only in their uncomplemented form.
    • Discuss

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