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Home Digital Electronics Combinational Logic Circuits See What Others Are Saying!
  • Question
  • Occasionally, a particular logic expression will be of no consequence in the operation of a circuit, such as in a BCD-to-decimal converter. These result in ________ terms in the K-map and can be treated as either ________ or ________, in order to ________ the resulting term.


  • Options
  • A. don't care, 1's, 0's, simplify
  • B. spurious, AND's, OR's, eliminate
  • C. duplicate, 1's, 0's, verify
  • D. spurious, 1's, 0's, simplify

  • Correct Answer
  • don't care, 1's, 0's, simplify 


  • More questions

    • 1. Edge-triggered flip-flops must have:

    • Options
    • A. very fast response times
    • B. at least two inputs to handle rising and falling edges
    • C. positive edge-detection circuits
    • D. negative edge-detection circuits
    • Discuss
    • 2. A positive edge-triggered D flip-flop will store a 1 when ________.

    • Options
    • A. the D input is HIGH and the clock transitions from HIGH to LOW
    • B. the D input is HIGH and the clock transitions from LOW to HIGH
    • C. the D input is HIGH and the clock is LOW
    • D. the D input is HIGH and the clock is HIGH
    • Discuss
    • 3. An active-HIGH input S-R latch has a 1 on the S input and a 0 on the R input. What state is the latch in?

    • Options
    • A.
    • B.
    • C.
    • D.
    • Discuss
    • 4. Binary-coded-decimal 0111 1001 0011 is ________ in binary.

    • Options
    • A. 011110010011
    • B. 010110101111
    • C. 001100110011
    • D. 001100011001
    • Discuss
    • 5. In the digital clock project HDL code, the MOD-12 counter is using ________.

    • Options
    • A. a BCD counter followed by a MOD-2 counter
    • B. a single HDL module
    • C. a MOD-6 counter followed by a MOD-2 counter
    • D. a MOD-12 counter followed by a D flip-flop
    • Discuss
    • 6. In Boolean algebra, = A.

    • Options
    • A. True
    • B. False
    • Discuss
    • 7. Why can a synchronous counter operate at a higher frequency than a ripple counter?

    • Options
    • A. The flip-flops change one after the other.
    • B. The flip-flops change at the same time.
    • C. A synchronous counter cannot operate at higher frequencies.
    • D. A ripple counter is faster.
    • Discuss
    • 8. Which of the following is correct for a D latch?

    • Options
    • A. The output toggles if one of the inputs is held HIGH.
    • B. Q output follows the input D when the enable is HIGH.
    • C. Only one of the inputs can be HIGH at a time.
    • D. The output complement follows the input when enabled.
    • Discuss
    • 9. The XOR gate will produce a HIGH output if only one but not both of the inputs is HIGH.

    • Options
    • A. True
    • B. False
    • Discuss
    • 10. A mnemonic is an English-like instruction that is converted by an assembler into a machine code for use by a processor.

    • Options
    • A. True
    • B. False
    • Discuss


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