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Home ‣ Digital Electronics ‣ Combinational Logic Circuits Comments
  • Question

  • What is the indication of a short to ground in the output of a driving gate?


  • Options
  • A. Only the output of the defective gate is affected.
  • B. There is a signal loss to all load gates.
  • C. The node may be stuck in either the HIGH or the LOW state.
  • D. The affected node will be stuck in the HIGH state.

  • Correct Answer
  • There is a signal loss to all load gates. 

    • Combinational Logic Circuits problems

    Search Results

    • 1. How many 1-of-16 decoders are required for decoding a 7-bit binary number?

    • Options
    • A. 5
    • B. 6
    • C. 7
    • D. 8
      • Discuss
    • 2. For the device shown here, let all D inputs be LOW, both S inputs be HIGH, and the input be HIGH. What is the status of the Y output?


    • Options
    • A. LOW
    • B. HIGH
    • C. Don't Care
    • D. Cannot be determined
      • Discuss
    • 3. For the device shown here, let all D inputs be LOW, both S inputs be HIGH, and the input be LOW. What is the status of the Y output?


    • Options
    • A. LOW
    • B. HIGH
    • C. Don't Care
    • D. Cannot be determined
      • Discuss
    • 4. Which of the circuits in figure (a to d) is the sum-of-products implementation of figure (e)?


    • Options
    • A. a
    • B. b
    • C. c
    • D. d
      • Discuss
    • 5. A logic probe is placed on the output of a gate and the display indicator is dim. A pulser is used on each of the input terminals, but the output indication does not change. What is wrong?

    • Options
    • A. The output of the gate appears to be open.
    • B. The dim indication on the logic probe indicates that the supply voltage is probably low.
    • C. The dim indication is a result of a bad ground connection on the logic probe.
    • D. The gate may be a tristate device.
      • Discuss
    • 6. When adding an even parity bit to the code 110010, the result is ________.

    • Options
    • A. 1110010
    • B. 1111001
    • C. 110010
    • D. 001101
      • Discuss
    • 7. The design concept of using building blocks of circuits in a PLD program is called a(n):

    • Options
    • A. hierarchical design.
    • B. architectural design.
    • C. digital design.
    • D. verilog.
      • Discuss
    • 8. The carry propagation can be expressed as ________.

    • Options
    • A. Cp = AB
    • B. Cp = A + B
    • C.
    • D.
      • Discuss
    • 9. How many flip-flops are in the 7475 IC?

    • Options
    • A. 1
    • B. 2
    • C. 4
    • D. 8
      • Discuss
    • 10. A 555 timer is connected for astable operation as shown below along with the output waveform. It is determined that the duty cycle should be 0.5. What steps need to be taken to correct the duty cycle, while maintaining the same output frequency?


    • Options
    • A. Increase the value of C.
    • B. Increase Vcc and decrease RL.
    • C. Decrease R1 and R2.
    • D. Decrease R1 and increase R2.
      • Discuss

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