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  • Question
  • What type of logic circuit is represented by the figure shown below?

    What type of logic circuit is represented by the figure shown below? XOR XNOR XAND XNAND


  • Options
  • A. XOR
  • B. XNOR
  • C. XAND
  • D. XNAND

  • Correct Answer
  • XNOR 


  • Combinational Logic Circuits problems


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    • 1. In VHDL, macrofunctions is/are:

    • Options
    • A. digital circuits.
    • B. analog circuits.
    • C. a set of bit vectors.
    • D. preprogrammed TTL devices.
    • Discuss
    • 2. Which of the following is an important feature of the sum-of-products form of expressions?

    • Options
    • A. All logic circuits are reduced to nothing more than simple AND and OR operations.
    • B. The delay times are greatly reduced over other forms.
    • C. No signal must pass through more than two gates, not including inverters.
    • D. The maximum number of gates that any signal must pass through is reduced by a factor of two.
    • Discuss
    • 3. 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
    • 4. 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
    • Discuss
    • 5. Which of the figures shown below represents the exclusive-NOR gate?


    • Options
    • A. a
    • B. b
    • C. c
    • D. d
    • Discuss
    • 6. What will a design engineer do after he/she is satisfied that the design will work?

    • Options
    • A. Put it in a flow chart
    • B. Program a chip and test it
    • C. Give the design to a technician to verify the design
    • D. Perform a vector test
    • Discuss
    • 7. Convert BCD 0001 0010 0110 to binary.

    • Options
    • A. 1111110
    • B. 1111101
    • C. 1111000
    • D. 1111111
    • Discuss
    • 8. How many data select lines are required for selecting eight inputs?

    • Options
    • A. 1
    • B. 2
    • C. 3
    • D. 4
    • Discuss
    • 9. For the device shown here, assume the D input is LOW, both S inputs are HIGH, and the input is HIGH. What is the status of the outputs?


    • Options
    • A. All are HIGH.
    • B. All are LOW.
    • C. All but are LOW.
    • D. All but are HIGH.
    • Discuss
    • 10. How many 4-bit parallel adders would be required to add two binary numbers each representing decimal numbers up through 30010?

    • Options
    • A. 1
    • B. 2
    • C. 3
    • D. 4
    • Discuss


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