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Home ‣ Digital Electronics ‣ Combinational Logic Circuits Comments
  • Question

  • The 7447A is a BCD-to-7-segment decoder with ripple blanking input and output functions. The purpose of these lines is to ________.


  • Options
  • A. turn off the display for any nonsignificant digit
  • B. turn off the display for any zero
  • C. turn off the display for leading or trailing zeros
  • D. test the display to assure all segments are operational

  • Correct Answer
  • turn off the display for any nonsignificant digit 

    • Combinational Logic Circuits problems

    Search Results

    • 1. The ________ statement evaluates the variable status.

    • Options
    • A. IF/THEN
    • B. IF/THEN/ELSE
    • C. CASE
    • D. ELSIF
      • Discuss
    • 2. A Karnaugh map will ________.

    • Options
    • A. eliminate the need for tedious Boolean simplifications
    • B. allow any circuit to be implemented with just AND and OR gates
    • C. produce the simplest sum-of-products expression
    • D. give an overall picture of how the signals flow through the logic circuit
      • Discuss
    • 3. The circuit given below implements the equation, .


    • Options
    • A. True
    • B. False
      • Discuss
    • 4. A pull-up resistor is a resistor used to keep a given point in a circuit HIGH when in the active state.

    • Options
    • A. True
    • B. False
      • Discuss
    • 5. In an even-parity system, the following data will produce a parity bit = 1.
      data = 1010011

    • Options
    • A. True
    • B. False
      • Discuss
    • 6. The correct output for this XOR truth table is ________.


    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 7. A circuit that can convert one of ten numerical keys pressed on a keyboard to BCD is a ________.

    • Options
    • A. priority encoder
    • B. decoder
    • C. multiplexer
    • D. demultiplexer
      • Discuss
    • 8. In VHDL, data can be each of the following types except ________.

    • Options
    • A. BIT
    • B. BIT_VECTOR
    • C. STD_LOGIC
    • D. STD_VECTOR
      • Discuss
    • 9. A 4-bit adder has the following inputs: C0 = 0, A1 = 0, A2 = 1, A3 = 0, A4 = 1, B1 = 0, B2 = 1, B3 = 1, B4 = 1. The output will be ________.

    • Options
    • A. 01100
    • B. 10101
    • C. 11000
    • D. 00011
      • Discuss
    • 10. In an odd-parity system, the data that will produce a parity bit = 1 is ________.

    • Options
    • A. data = 1010011
    • B. data = 1111000
    • C. data = 1100000
    • D. All of the above
      • Discuss

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