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  • Question

  • What starts a free-running multivibrator?


  • Options
  • A. a trigger
  • B. an input signal
  • C. an external circuit
  • D. nothing

  • Correct Answer
  • nothing 

    • Operational Amplifiers problems

    Search Results

    • 1. What is the output waveform?


    • Options
    • A. sine wave
    • B. square wave
    • C. +15 V
    • D. ?15 V
      • Discuss
    • 2. The magnitude of closed-loop voltage gain (Acl) of an inverting amplifier equals:

    • Options
    • A. the ratio of the input resistance to the feedback resistance
    • B. the open-loop voltage gain Aol
    • C. the feedback resistance divided by the input resistance
    • D. the input resistance
      • Discuss
    • 3. An output that is proportional to the addition of two or more inputs is from which type of amplifier?

    • Options
    • A. differentiator
    • B. difference
    • C. summing
    • D. analog subtractor
      • Discuss
    • 4. When a capacitor is used in place of a resistor in an op-amp network, its placement determines:

    • Options
    • A. open- or closed-loop gain
    • B. integration or differentiation
    • C. saturation or cutoff
    • D. addition or subtraction
      • Discuss
    • 5. If the gain of a closed-loop inverting amplifier is 3.9, with an input resistor value of 1.6 kilohms, what value of feedback resistor is necessary?

    • Options
    • A. 6240 ohms
    • B. 2.4 kilohms
    • C. 410 ohms
    • D. 0.62 kilohms
      • Discuss
    • 6. The closed-loop voltage gain of an inverting amplifier equals:

    • Options
    • A. the ratio of the input resistance to the feedback resistance
    • B. the open-loop voltage gain
    • C. the feedback resistance divided by the input resistance
    • D. the input resistance
      • Discuss
    • 7. With a differential gain of 50,000 and a common-mode gain of 2, what is the common-mode rejection ratio?

    • Options
    • A. ?87.9 dB
    • B. ?43.9 dB
    • C. 43.9 dB
    • D. 87.9 dB
      • Discuss
    • 8. What is the cutoff frequency of this low-pass filter?


    • Options
    • A. 4.8 kHz
    • B. 3.8 kHz
    • C. 2.8 kHz
    • D. 1.8 kHz
      • Discuss
    • 9. How many leads does the TO-5 metal can package of an operational amplifier have?

    • Options
    • A. 8, 10, or 12
    • B. 6, 8, or 10
    • C. 8 or 14
    • D. 8 or 16
      • Discuss
    • 10. A circuit that uses an amplifier with passive filter elements is called a(n):

    • Options
    • A. relaxation oscillator
    • B. signal generator
    • C. differential amplifier
    • D. active filter
      • Discuss

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