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  • Question

  • A virtual ground is a(n) ______ ground because this point is at zero volts.


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

  • Correct Answer
  • voltage 

    • Operational Amplifiers problems

    Search Results

    • 1. 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
    • 2. 

      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
    • 3. 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
    • 4. Current cannot flow to ground through a(n) ________.

    • Options
    • A. mechanical ground
    • B. ac ground
    • C. virtual ground
    • D. virtual short
      • Discuss
    • 5. Common-mode signals have _____.

    • Options
    • A. the same amplitude
    • B. the same phase
    • C. the same frequency
    • D. All of the above
      • Discuss
    • 6. 

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


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

      The given circuit is ___.


    • Options
    • A. an inverting amplifier
    • B. a noninverting amplifier
    • C. a voltage follower
    • D. a differential amplifier
      • Discuss
    • 8. The resistors Rf and Ri in an op-amp circuit control ______ .

    • Options
    • A. positive feedback and current gain
    • B. negative feedback and power gain
    • C. negative feedback and voltage gain
    • D. open and closed loop gain
      • Discuss
    • 9. The 555 timer can be connected to operate a(n) ___________.

    • Options
    • A. astable multivibrator
    • B. bistable multivibrator
    • C. monostable multivibrator
    • D. astable multivibrator and a monostable multivibrator
      • Discuss
    • 10. An oscillator whose frequency can be controlled by an input "control voltage" is called a(n) ______ .

    • Options
    • A. PLL
    • B. Schmitt trigger
    • C. VCO
    • D. S-R latch
      • Discuss

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