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Home ‣ Digital Electronics ‣ Combinational Logic Circuits See What Others Are Saying!
  • Question

  • A 74HC147 priority encoder has ten active-LOW inputs and four active-LOW outputs. What would be the state of the four outputs if inputs 4 and 5 are LOW and all other inputs are HIGH?


  • Options
  • A. A 74HC147 priority encoder has ten active-LOW inputs and four active-LOW outputs. What would be the
  • B. A 74HC147 priority encoder has ten active-LOW inputs and four active-LOW outputs. What would be the
  • C. A 74HC147 priority encoder has ten active-LOW inputs and four active-LOW outputs. What would be the
  • D. A 74HC147 priority encoder has ten active-LOW inputs and four active-LOW outputs. What would be the

  • Correct Answer
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    • More questions

    • 1. How many gates would be required to implement the following Boolean expression before simplification? XY + X(X + Z) + Y(X + Z)

    • Options
    • A. 1
    • B. 2
    • C. 4
    • D. 5
      • Discuss
    • 2. 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
      • Discuss
    • 3. In an even-parity system, the following data will produce a parity bit = 1.
      data = 1010011

    • Options
    • A. True
    • B. False
      • Discuss
    • 4. Mapping the SOP expression , we get ________.


    • Options
    • A. (A)
    • B. (B)
    • C. (C)
    • D. (D)
      • Discuss
    • 5. In the digital clock project, the AHDL block codes are connected using graphic design files.

    • Options
    • A. True
    • B. False
      • Discuss
    • 6. The main advantage of semiconductor RAM is its ability to:

    • Options
    • A. retain stored data when power is interrupted or turned off
    • B. be written to and read from rapidly
    • C. be randomly accessed
    • D. be sequentially accessed
      • Discuss
    • 7. The binary number for octal 458 is ________.

    • Options
    • A. 100010
    • B. 100101
    • C. 110101
    • D. 100100
      • Discuss
    • 8. Which of the following instructions will move the contents of the accumulator to register 6?

    • Options
    • A. MOV 6R, A
    • B. MOV R6, A
    • C. MOV A, 6R
    • D. MOV A, R6
      • Discuss
    • 9. Because of their nonvolatility, high speed, low power requirements, and lack of moving parts, ________ have become feasible alternatives to magnetic disk storage.

    • Options
    • A. CD-ROMs
    • B. flash memory modules
    • C. ROMs
    • D. EPROMs
      • Discuss
    • 10. What two functions does a DRAM controller perform?

    • Options
    • A. address multiplexing and data selection
    • B. address multiplexing and the refresh operation
    • C. data selection and the refresh operation
    • D. data selection and CPU accessing
      • Discuss

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