Operational Amplifiers 3 Questions and Answers

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Q31
The midrange open-loop gain of an op-amp is 135 dB. With negative feedback this gain is reduced to 72 dB. The closed-loop gain is
  • A 135 dB.
  • B 72 dB.
  • C 207 dB.
  • D 63 dB.
Answer: Option B
Q32
What is the level of the current through the amplifier input(s) to ground in an op-amp?
  • A Virtually zero
  • B 1.7 mA
  • C 2.8 mA
  • D 3.3 mA
Answer: Option A
Q33
Open-loop voltage gain of an op-amp can range up to ________.
  • A 10,000
  • B 50,000
  • C 100,000
  • D 200,000
Answer: Option D
Q34
At what input voltage level does the output voltage level become numerically equal to the value of the common-mode gain of the amplifier?
  • A Vi1 = –Vi2 = 0.25 V
  • B Vi1 = –Vi22 = 0.50 V
  • C Vi1 = –Vi2 = 0.75 V
  • D Vi1 = –Vi2 = 1.00 V
Answer: Option B
Q35
Which of the following is (are) the result of gain reduction by a feedback?
  • A The amplifier voltage gain is a more stable and precise value.
  • B The input impedance of the circuit is increased over that of the op-amp alone.
  • C The output impedance is reduced over that of the op-amp alone.
  • D All of the above
Answer: Option D
Q36
An inverting amplifier has an input impedance equal to the feedback resistor Rf.
  • A TRUE
  • B FALSE
Answer: Option B
Q37
Closed-loop gain is the gain with negative feedback.
  • A TRUE
  • B FALSE
Answer: Option A
Q38
Negative feedback decreases the bandwidth and increases the voltage gain.
  • A TRUE
  • B FALSE
Answer: Option B
Q39
A good op-amp has low voltage gain, low output impedance, and high input impedance.
  • A TRUE
  • B FALSE
Answer: Option B
Q40
A non-inverting amplifier has a higher input impedance and a lower output impedance than the op-amp itself (without feedback).
  • A TRUE
  • B FALSE
Answer: Option A

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