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Home ‣ Digital Electronics ‣ Multivibrators and 555 Timer See What Others Are Saying!
  • Question

  • Which mode of operation is being used when a 555 timer chip has two external resistors and an external capacitor?


  • Options
  • A. monostable
  • B. pulse stretching
  • C. Schmitt triggering
  • D. astable

  • Correct Answer
  • astable 

    • More questions

    • 1. The Boolean equation ________ results from this Karnaugh map.


    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 2. The circuit shown below is a(n) ________.


    • Options
    • A. R/2R ladder D/A converter
    • B. four-bit decoder
    • C. binary-weighted-input DAC
    • D. four-bit A/D converter
      • Discuss
    • 3. In VHDL, what is a GENERATE statement?

    • Options
    • A. The start statement of a program
    • B. Not used in VHDL or ADHL
    • C. A way to get the computer to generate a program from a circuit diagram
    • D. A way to tell the compiler to replicate several components
      • Discuss
    • 4. The output current capability for a HIGH output condition is called a source current.

    • Options
    • A. True
    • B. False
      • Discuss
    • 5. The number of gates that can be connected to a single output without exceeding the current ratings of the gate is called ________.

    • Options
    • A. fan-out
    • B. propagation
    • C. dissipation
    • D. SSI
      • Discuss
    • 6. A major advantage of ECL logic over TTL and CMOS is ________.

    • Options
    • A. low power dissipation
    • B. high speed
    • C. both low power dissipation and high speed
    • D. neither low power dissipation nor high speed
      • Discuss
    • 7. Programs written for the 8080A must have slight modifications to run on the 8085A.

    • Options
    • A. True
    • B. False
      • Discuss
    • 8. The Boolean expression is equal to ________.

    • Options
    • A. C
    • B. D
    • C. C + D
    • D. 1
      • Discuss
    • 9. 111010002 is the 2's-complement representation of ?24.

    • Options
    • A. True
    • B. False
      • Discuss
    • 10. When the output of an AND-OR circuit is complemented, it results in an AND-OR-Invert circuit.

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

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