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  • Question

  • Current cannot flow to ground through a(n) ________.


  • Options
  • A. mechanical ground
  • B. ac ground
  • C. virtual ground
  • D. virtual short

  • Correct Answer
  • virtual ground 

    • Operational Amplifiers problems

    Search Results

    • 1. Common-mode signals have _____.

    • Options
    • A. the same amplitude
    • B. the same phase
    • C. the same frequency
    • D. All of the above
      • Discuss
    • 2. ______ is NOT a characteristic of an ideal op-amp.

    • Options
    • A. Infinite voltage gain
    • B. Minimum bandwidth
    • C. Infinite input impedance
    • D. Zero output impedance
      • Discuss
    • 3. The Q of a crystal _________.

    • Options
    • A. is extremely low
    • B. is about 40 or so in most cases
    • C. is extremely high
    • D. none of the above
      • Discuss
    • 4. 

      The input voltage must be ______ in the given circuit to obtain the given output voltage.


    • Options
    • A. 343 mV
    • B. 400 mV
    • C. 480 mV
    • D. 600 mV
      • Discuss
    • 5. The common-mode rejection ratio (CMMR) is the ratio of _____ to ______.

    • Options
    • A. the differential voltage gain, the common-mode voltage gain
    • B. the differential power gain, the common-mode power gain
    • C. the ideal voltage gain, the actual voltage gain
    • D. signal voltage, noise voltage
      • Discuss
    • 6. The voltage required to force the differential output to zero is called _______.

    • Options
    • A. input-offset current
    • B. input-offset voltage
    • C. input bias current
    • D. slew rate voltage
      • Discuss
    • 7. 

      The input impedance is ______ for the amplifier in the given circuit. The data sheet values are Zin = 3 MΩ, Zout = 80 Ω, and Aol = 250,000.


    • Options
    • A. 4.7 kΩ
    • B. 22.7 kΩ
    • C. 3 MΩ
    • D. 68.6 kΩ
      • Discuss
    • 8. An op-amp circuit in which the output voltage is equal to the difference between the two input voltages is called a(n) _____

    • Options
    • A. integrator
    • B. differentiator
    • C. differential amplifier
    • D. voltage regulator
      • Discuss
    • 9. A virtual ground is a(n) ______ ground because this point is at zero volts.

    • Options
    • A. ordinary
    • B. voltage
    • C. chassis
    • D. earth
      • Discuss
    • 10. 

      The voltage gain is ______ for the amplifier in the given circuit.


    • Options
    • A. ?4
    • B. ?5
    • C. ?6
    • D. ?7
      • Discuss

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