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Combinational Logic Circuits problems


  • 1. Which statement below best describes a Karnaugh map?

  • Options
  • A. A Karnaugh map can be used to replace Boolean rules.
  • B. The Karnaugh map eliminates the need for using NAND and NOR gates.
  • C. Variable complements can be eliminated by using Karnaugh maps.
  • D. Karnaugh maps provide a visual approach to simplifying Boolean expressions.
  • Discuss
  • 2. The binary numbers A = 1100 and B = 1001 are applied to the inputs of a comparator. What are the output levels?

  • Options
  • A. A > B = 1, A < B = 0, A < B = 1
  • B. A > B = 0, A < B = 1, A = B = 0
  • C. A > B = 1, A < B = 0, A = B = 0
  • D. A > B = 0, A < B = 1, A = B = 1
  • Discuss
  • 3. Convert BCD 0001 0111 to binary.

  • Options
  • A. 10101
  • B. 10010
  • C. 10001
  • D. 11000
  • Discuss
  • 4. Which of the following statements accurately represents the two BEST methods of logic circuit simplification?

  • Options
  • A. Boolean algebra and Karnaugh mapping
  • B. Karnaugh mapping and circuit waveform analysis
  • C. Actual circuit trial and error evaluation and waveform analysis
  • D. Boolean algebra and actual circuit trial and error evaluation
  • Discuss
  • 5. Each "1" entry in a K-map square represents:

  • Options
  • A. a HIGH for each input truth table condition that produces a HIGH output.
  • B. a HIGH output on the truth table for all LOW input combinations.
  • C. a LOW output for all possible HIGH input conditions.
  • D. a DON'T CARE condition for all possible input truth table combinations.
  • Discuss
  • 6. A certain BCD-to-decimal decoder has active-HIGH inputs and active-LOW outputs. Which output goes LOW when the inputs are 1001?

  • Options
  • A. 0
  • B. 3
  • C. 9
  • D. None. All outputs are HIGH.
  • Discuss
  • 7. Which of the following expressions is in the sum-of-products form?

  • Options
  • A. (A + B)(C + D)
  • B. (AB)(CD)
  • C. AB(CD)
  • D. AB + CD
  • Discuss
  • 8. Which gate is best used as a basic comparator?

  • Options
  • A. NOR
  • B. OR
  • C. Exclusive-OR
  • D. AND
  • Discuss
  • 9. The implementation of simplified sum-of-products expressions may be easily implemented into actual logic circuits using all universal ________ gates with little or no increase in circuit complexity. (Select the response for the blank space that will BEST make the statement true.)

  • Options
  • A. AND/OR
  • B. NAND
  • C. NOR
  • D. OR/AND
  • Discuss
  • 10. In HDL, LITERALS is/are:

  • Options
  • A. digital systems.
  • B. scalars.
  • C. binary coded decimals.
  • D. a numbering system.
  • Discuss

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