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  • Question

  • The equation for the output frequency of a 555 timer operating in the astable mode is: The equation for the output frequency of a 555 timer operating in the astable mode is: . What value .
    What value of C1 will be required if R1 = 1 kΩ, R2 = 1 kΩ, and f = 1 kHz?


  • Options
  • A. 0.33 µF
  • B. 0.48 µF
  • C. 480 µF
  • D. 33 nF

  • Correct Answer
  • 0.48 µF 

    • More questions

    • 1. 

      The voltage across the inductor is ______ in the given circuit.


    • Options
    • A. 6.5 V
    • B. 12.4 V
    • C. 14 V
    • D. 50 V
      • Discuss
    • 2. The phase angle of an RC series circuit is = invtan (XC/R) = invtan (VC/VR).

    • Options
    • A. True
    • B. False
      • Discuss
    • 3. A digital logic device used as a buffer should have what input/output characteristics?

    • Options
    • A. high input impedance and high output impedance
    • B. low input impedance and high output impedance
    • C. low input impedance and low output impedance
    • D. high input impedance and low output impedance
      • Discuss
    • 4. To reduce the number of pins on the IC package, manufacturers often use ___________.

    • Options
    • A. MOSFET architecture
    • B. address multiplexing
    • C. address decoding
    • D. address demultiplexing
      • Discuss
    • 5. If a sine wave signal is 100 mV peak-to-peak, how many volts would be measured by a voltmeter?

    • Options
    • A. 14.14 mV
    • B. 35.4 mV
    • C. 63.7 mV
    • D. 70.7 mV
      • Discuss
    • 6. 

      In the given circuit, what is RUNK equal to if RV must be adjusted to 1,232 Ω in order to balance the bridge?


    • Options
    • A. 220 Ω
    • B. 6,899 Ω
    • C. 1,232 Ω
    • D. More information is needed in order to find RUNK.
      • Discuss
    • 7. Current cannot flow to ground through a(n) ________.

    • Options
    • A. mechanical ground
    • B. ac ground
    • C. virtual ground
    • D. virtual short
      • Discuss
    • 8. Once a PAL has been programmed:

    • Options
    • A. it cannot be reprogrammed.
    • B. its outputs are only active HIGHs
    • C. its outputs are only active LOWs
    • D. its logic capacity is lost
      • Discuss
    • 9. 
      Atoms in a silicon crystal are held together by ___ bonds.

    • Options
    • A. crystal
    • B. chemical
    • C. electrical
    • D. covalent
      • Discuss
    • 10. Maximum power will transfer across a transformer when the primary impedance equals the secondary impedance.

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

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