Operational Amplifiers 3 Questions and Answers

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Q21
In which of the following operations is the resulting output signal of the differential amplifier near zero?
  • A Single-ended
  • B Double-ended
  • C Common-mode
  • D None of the above
Answer: Option C
Q22
What is the voltage gain of the unity follower?
  • A 0
  • B 1
  • C –1
  • D Infinity
Answer: Option B
Q23
Negative feedback added to an op-amp ________ the bandwidth and ________ the gain.
  • A increases, increases
  • B increases, decreases
  • C decreases, decreases
  • D decreases, increases
Answer: Option B
Q24
What is the scale multiplier (factor) of a basic integrator?
  • A R / C
  • B C / R
  • C –RC
  • D –1 / RC
Answer: Option D
Q25
Which of the following circuits is referred to as a BiMOS circuit?
  • A Bipolar and FET
  • B Bipolar and MOSFET
  • C Opposite-type MOSFETs
  • D None of the above
Answer: Option B
Q26
In the differential amplifier circuit, which of the following terminals are connected together?
  • A Bases
  • B Collectors
  • C One base to another collector
  • D Emitters
Answer: Option D
Q27
What is the cutoff frequency of an op-amp if the unity-gain frequency is 1.5 MHz and the open-loop gain is 100,000?
  • A 5 Hz
  • B 10 Hz
  • C 15 Hz
  • D 20 Hz
Answer: Option C
Q28
The ________ is the voltage gain of an op-amp with external feedback.
  • A Aol
  • B Acl
  • C Av
  • D [NIL]
Answer: Option B
Q29
A(n) ________ amplifier configuration has an input impedance approximately equal to the input resistor Ri and an output impedance approximately equal to the output impedance of the op-amp itself.
  • A non-inverting
  • B inverting
  • C voltage-follower
  • D [NIL]
Answer: Option B
Q30
What is the difference voltage if the inputs are an ideal in-phase signal?
  • A The differential gain times twice the input signal.
  • B The differential gain times the input signal.
  • C The common-mode gain times twice the input signal.
  • D The common-mode gain times the input signal.
Answer: Option D

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