Voltage Series Feedback Amplifier MCQ

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• Find the bandwidth and total output offset voltage of a voltage follower? The following are the specifications for the op-amp 741: A=200000, fo =5hz and supply voltage =±15v.
  ক

  fF = 1000hz, VooT = ± 7.5µv.

  খ

  fF = 100khz, VooT = ± 7.5µv.

  গ

  fF = 10khz, VooT = ±7.5µv.

  ঘ

  fF = 1000khz, VooT = ± 7.5µv.
• Voltage follower is also called as
  ক

  None of the mentioned

  খ

  Non-inverting amplifier

  গ

  Inverting amplifier

  ঘ

  Normal buffer
• Find the input and output voltage in voltage follower circuit?
  ক

  Vin=2v and Vout = 3v

  খ

  Vin=10v and Vout = 11v

  গ

  Vin=9v and Vout = 9v

  ঘ

  Vin=4v and Vout = 7v
• Which is preferred to attain higher input resistance and the output amplitude equal to input?
  ক

  Voltage follower

  খ

  Voltage series feedback amplifier

  গ

  Voltage shunt feedback amplifier

  ঘ

  Inverter
• What is the gain of voltage follower?
  ক

  Gain > ∞

  খ

  Gain –>1

  গ

  Gain <1

  ঘ

  Gain –>∞
• Which of the following has the same characteristic as that of non-inverting amplifier with feedback?
  ক

  Perfect feedback amplifier

  খ

  Voltage follower

  গ

  Perfect voltage amplifier

  ঘ

  All of the mentioned
• What is the formula for total output offset voltage with feedback?
  ক

  VooT = ± Vo/(1+AB)

  খ

  VooT = ± Vsat*(1+AB)

  গ

  VooT = ± Vsat/(1+AB)

  ঘ

  VooT = ± Vo*(1+AB)
• How are the saturation voltage specified on the manufacture’s datasheet?
  ক

  Negative voltage

  খ

  Output voltage swing

  গ

  Supply voltage

  ঘ

  None of the mentioned
• The bandwidth of a non-inverting amplifier with feedback is equal to
  ক

  fo(AB)

  খ

  fo(AB-1)

  গ

  fo(1+AB)

  ঘ

  fo(1-AB)
• Find the unity gain bandwidth for voltage series feedback amplifier?
  ক

  UBG = Afo

  খ

  UBG = AfF

  গ

  UBG = Afo fF

  ঘ

  UBG = AFfo
• The output resistance of the op-amp with feedback is
  ক

  Same as that of the output resistance without feedback

  খ

  Greater than that of the output resistance without feedback

  গ

  Smaller than that of the output resistance without feedback

  ঘ

  None of the mentioned
• Find the input and output resistance for the circuit shown. Specification for 741 op-amp : A=400000 ; Ri = 33MΩ; Ro = 60Ω; RF = 11kΩ; R1 = 2kΩ; Supply voltage = ± 15v; Maximum output voltage swing = ± 13v.
  ক

  RIF = 66MΩ, ROF = 30Ω

  খ

  RIF = 30MΩ, ROF = 6kΩ

  গ

  RIF = 15kΩ, ROF = 50MΩ

  ঘ

  None of the mentioned
• When the non-inverting input terminal of an op-amp is equal to that of the inverting input terminal (ideally)
  ক

  a–>∞

  খ

  Vid ≅ 0

  গ

  AF = 1+( RF / R1)

  ঘ

  All of the mentioned
• Define the input resistance with feedback for voltage series feedback amplifier?
  ক

  RIF = (1-AB)

  খ

  RIF = (AB-1)

  গ

  RIF = (1+AB)

  ঘ

  None of the mentioned
• What must be the value of external components used in voltage series feedback amplifier?
  ক

  Less than 1MΩ

  খ

  Less than 10MΩ

  গ

  Less than 100MΩ

  ঘ

  Less than 0.1MΩ
• For the feedback circuit of voltage series feedback amplifier, find the feedback voltage for the specifications: R1=1kΩ, RF = 10kΩ and Vo= 25v.
  ক

  12.5v

  খ

  22v

  গ

  0.9v

  ঘ

  2.3v
• Which factor determines the gain of the voltage series feedback amplifier?
  ক

  Open loop voltage gain

  খ

  Feedback voltage

  গ

  Ratio of two resistors

  ঘ

  Gain of feedback circuit
• Express closed loop voltage gain (AF) in terms of open loop gain (A) and feedback circuit gain (B)?
  ক

  AF = A/AB

  খ

  AF = 1+ (A/AB)

  গ

  AF = A/(1+AB)

  ঘ

  AF = AB/(1+A)
• Why the feedback circuit is said to be negative for voltage series feedback amplifier?
  ক

  Feedback voltage is 180o out of phase with respect to input voltage

  খ

  Input voltage is 180o out of phase with respect to feedback voltage

  গ

  Feedback voltage is in same phase with respect to input voltage

  ঘ

  Input voltage is in same phase with respect to feedback voltage
• How is the difference voltage calculated in closed loop non-inverting amplifier?
  ক

  Vid= Vo – Vf

  খ

  Vid= Vin – Vf

  গ

  Vid= Vo – Vin

  ঘ

  Vid= Vf – Vin
• If the feedback voltage and the output voltage are given as 10v and 4v. Find the gain of the feedback circuit in voltage-series feedback amplifier?
  ক

  2.5v

  খ

  40v

  গ

  3v

  ঘ

  6.2v
• Specify the voltage gain of non-inverting amplifier with feedback amplifier with and without feedback?
  ক

  A= Vo/Vid, AF = Vf/Vo

  খ

  A= Vf/Vid, AF= Vo/Vf

  গ

  A= Vo/Vid, AF= Vo/Vin

  ঘ

  A= Vf/Vid, AF = Vf/Vin