Operational Amplifiers 2 Questions and Answers

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Q31
An output that is proportional to the addition of two or more inputs is from which type of amplifier?
  • A differentiator
  • B difference
  • C summing
  • D analog subtractor
Answer: Option C
Q32
In a PLL, to obtain lock, the signal frequency must:
  • A come within the lock range
  • B be less than the capture frequency
  • C come within the capture range
  • D be greater than the capture frequency
Answer: Option C
Q33
An ideal amplifier should have:
  • A high input current
  • B zero offset
  • C high output impedance
  • D moderate gain
Answer: Option B
Q34
A differential amplifier has a common-mode gain of 0.2 and a common-mode rejection ratio of 3250. What would the output voltage be if the single-ended input voltage was 7 mV rms?
  • A 1.4 mV rms
  • B 650 mV rms
  • C 4.55 V rms
  • D 0.455 V rms
Answer: Option C
Q35
The magnitude of closed-loop voltage gain (Acl) of an inverting amplifier equals:
  • A the ratio of the input resistance to the feedback resistance
  • B the open-loop voltage gain Aol
  • C the feedback resistance divided by the input resistance
  • D the input resistance
Answer: Option C
Q36
What is the difference between common-mode and differential-mode input signals?
  • A phase relationship
  • B voltage
  • C current
  • D apparent power
Answer: Option A
Q37
A circuit that uses an amplifier with passive filter elements is called a(n):
  • A relaxation oscillator
  • B signal generator
  • C differential amplifier
  • D active filter
Answer: Option D

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