Operational Amplifiers 3 Questions and Answers

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Q1
For an op-amp having a slew rate SR = 5 V/ms, what is the maximum closed-loop voltage gain that can be used when the input signal varies by 0.2 V in 10 ms?
  • A 150
  • B 200
  • C 250
  • D 300
Answer: Option C
Q2
An op-amp has an open-loop gain of 100,000 and a cutoff frequency of 40 Hz. Find the open-loop gain at a frequency of 30 Hz.
  • A 800
  • B 8,000
  • C 80,000
  • D 100,000
Answer: Option D
Q3
What is the level of the voltage between the input terminals of an op-amp?
  • A Virtually zero
  • B 5 V
  • C 18 V
  • D 22 V
Answer: Option A
Q4
An op-amp has an open-loop gain of 75,000 and a cutoff frequency of 100 Hz. At 1 kHz the open-loop gain is down by
  • A 10 dB.
  • B 6 dB.
  • C 20 dB.
  • D 3 dB.
Answer: Option C
Q5
What is the difference output voltage of any signals applied to the input terminals?
  • A The differential gain times the difference input voltage.
  • B The common-mode gain times the common input voltage.
  • C The sum of the differential gain times the difference input voltage and the common-mode gain times the common input voltage.
  • D The difference of the differential gain times the difference input voltage and the common-mode gain times the common input voltage.
Answer: Option C
Q6
A three-stage op-amp can have a maximum phase lag of ________°.
  • A –180
  • B –90
  • C –270
  • D none of the above
Answer: Option C
Q7
The summing amplifier contains an inverting amplifier.
  • A TRUE
  • B FALSE
Answer: Option A
Q8
What is the open-loop gain of an op-amp at the gain-bandwidth product of the op-amp?
  • A 200,000
  • B 50,000
  • C 200
  • D 1
Answer: Option D
Q9
The ________ amplifier configuration has the highest input impedance and the lowest output impedance of the three basic op-amp configurations.
  • A non-inverting
  • B inverting
  • C voltage-follower
  • D [NIL]
Answer: Option C
Q10
A certain op-amp has an open-loop voltage gain of 150,000. What is this gain expressed in dB?
  • A 51.7 dB
  • B 103.5 dB
  • C 150,000 dB
  • D 5.18 dB
Answer: Option B

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