Electronic Devices and Circuit Theory-Oscillator Circuits Questions and Answers

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Q21
The twin-T oscillator produces a ________ response.
  • A low-pass
  • B high-pass
  • C band-pass
  • D band-stop
Answer: Option D
Q22
What is the typical value of quality factor for crystal oscillators?
  • A 20,000
  • B 1000
  • C 100
  • D 10
Answer: Option A
Q23
Which of the following improvements is (are) a result of the negative feedback in a circuit?
  • A Higher input impedance
  • B Better stabilized voltage gain
  • C Improved frequency response
  • D All of the above
Answer: Option D
Q24
In the Wien bridge oscillator, which of the following is (are) frequency-determining components?
  • A R1 and R2
  • B C1 and C2
  • C R1, R2, C1, and C2
  • D None of the above
Answer: Option C
Q25
A certain oscillator has a tap on the inductor in the tank circuit. This oscillator is probably
  • A a Colpitts oscillator.
  • B a Clapp oscillator
  • C a crystal oscillator.
  • D a Hartley oscillator.
Answer: Option D
Q26
At parallel resonance, the impedance of a crystal is
  • A minimum.
  • B maximum.
  • C equal
  • D zero.
Answer: Option B
Q27
Calculate the fr of a lead-lag network if R1 = R2 = 6.8 k, and C1 = C2 = 0.05 F.
  • A 468 Hz
  • B 4.68 kHz
  • C 46.8 kHz
  • D 468 kHz
Answer: Option A
Q28
Which of the following is (are) feedback?
  • A Voltage-series
  • B Voltage-shunt
  • C Current-series
  • D All of the above
Answer: Option D
Q29
What is the relationship between the series and parallel resonant frequencies of a quartz crystal?
  • A They are equal.
  • B Parallel resonant frequency is approximately 1 kHz higher than series resonant frequency.
  • C Series resonant frequency is approximately 1 kHz higher than parallel resonant frequency.
  • D none of the above
Answer: Option B
Q30
An op-amp integrator has a square-wave input. The output should be
  • A a sine wave.
  • B a triangle wave.
  • C a square wave
  • D pure dc.
Answer: Option B
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