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Combinational Logic Circuits problems

  • 1. 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
  • 2. In VHDL, macrofunctions is/are:

  • Options
  • A. digital circuits.
  • B. analog circuits.
  • C. a set of bit vectors.
  • D. preprogrammed TTL devices.
    • Discuss
  • 3. What type of logic circuit is represented by the figure shown below?

    Digital Electronics Combinational Logic Circuits: What type of logic circuit is represented by the figure shown below?


  • Options
  • A. XOR
  • B. XNOR
  • C. XAND
  • D. XNAND
    • Discuss
  • 4. 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
  • 5. Convert BCD 0001 0010 0110 to binary.

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

  • Options
  • A. 1
  • B. 2
  • C. 3
  • D. 4
    • Discuss
  • 7. For the device shown here, assume the D input is LOW, both S inputs are HIGH, and the Digital Electronics Combinational Logic Circuits: 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 Digital Electronics Combinational Logic Circuits: For the device shown here, assume the D input is LOW, both S inputs are HIGH, and the outputs?

    Digital Electronics Combinational Logic Circuits: For the device shown here, assume the D input is LOW, both S inputs are HIGH, and the


  • Options
  • A. All are HIGH.
  • B. All are LOW.
  • C. All but are LOW.
  • D. All but are HIGH.
    • Discuss
  • 8. 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
  • 9. Solve the network in the figure given below for X.

    Digital Electronics Combinational Logic Circuits: Solve the network in the figure given below for X.


  • Options
  • A. A + BC + D
  • B. ((A + B)C) + D
  • C. D(A + B + C)
  • D. (AC + BC)D
    • Discuss
  • 10. As a technician you are confronted with a TTL circuit board containing dozens of IC chips. You have taken several readings at numerous IC chips, but the readings are inconclusive because of their erratic nature. Of the possible faults listed, select the one that most probably is causing the problem.

  • Options
  • A. A defective IC chip that is drawing excessive current from the power supply
  • B. A solar bridge between the inputs on the first IC chip on the board
  • C. An open input on the first IC chip on the board
  • D. A defective output IC chip that has an internal open to Vcc
    • Discuss

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