Operational Amplifiers 2 Questions and Answers

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Q21
In an open-loop op-amp circuit, whenever the inverting input (–) is negative relative to the noninverting input (+), the output will:
  • A swing negative
  • B close the loop
  • C be balanced
  • D swing positive
Answer: Option D
Q22
With a differential gain of 50,000 and a common-mode gain of 2, what is the common-mode rejection ratio?
  • A –87.9 dB
  • B –43.9 dB
  • C 43.9 dB
  • D 87.9 dB
Answer: Option D
Q23
If the input to a comparator is a sine wave, the output is a:
  • A ramp voltage
  • B sine wave
  • C rectangular wave
  • D sawtooth wave
Answer: Option C
Q24
What three subcircuits does a phase locked loop (PLL) consist of?
  • A phase comparator, comparator, and VCO
  • B phase comparator, bandpass filter, and VCO
  • C phase comparator, bandpass filter, and demodulator
  • D phase comparator, low-pass filter, and VCO
Answer: Option D
Q25
The major difference between ground and virtual ground is that virtual ground is only a:
  • A voltage reference
  • B current reference
  • C power reference
  • D difference reference
Answer: Option A
Q26
If an op-amp has one input grounded and the other input has a signal feed to it, then it is operating as what?
  • A Common-mode
  • B Single-ended
  • C Double-ended
  • D Noninverting mode
Answer: Option B
Q27
If the feedback/input resistor ratio of a feedback amplifier is 4.6 with 1.7 V applied to the noninverting input, what is the output voltage value?
  • A 7.82 V
  • B saturation
  • C cutoff
  • D 9.52 V
Answer: Option D
Q28
The Schmitt trigger is a two-state device that is used for:
  • A pulse shaping
  • B peak detection
  • C input noise rejection
  • D filtering
Answer: Option A
Q29
When a capacitor is used in place of a resistor in an op-amp network, its placement determines:
  • A open- or closed-loop gain
  • B integration or differentiation
  • C saturation or cutoff
  • D addition or subtraction
Answer: Option B
Q30
How many logic states does an S-R flip-flop have?
  • A 2
  • B 3
  • C 4
  • D 5
Answer: Option C

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