For a phase-shift oscillator, the gain of the amplifier stage must be greater than ________
  • a) 19
  • b) 30
  • c) 29
  • d) 1
What is the minimum frequency at which a crystal will oscillate?
  • a) fundamental
  • b) seventh harmonic
  • c) second harmonic
  • d) third harmonic
A circuit that can change the frequency of oscillation with an application of a dc voltage is sometimes called___________
  • a) a crystal oscillator
  • b) a voltage-controlled oscillator
  • c) an astable multivibrator
  • d) a Hartley oscillator
In order to start up, a feedback oscillator requires______
  • a) unity feedback equal to 1
  • b) negative feedback less than 1
  • c) positive feedback greater than 1
  • d) no feedback
The Nyquist plot combines the two Bode plots of gain versus frequency and phase shift versus frequency on a single plot.
  • a) True
  • b) False
An input signal is needed for an oscillator to start.
  • a) True
  • b) False
The lead-lag circuit in the Wien-bridge oscillator has a resonant frequency at which the attenuation is_________
  • a) 1/2
  • b) 1/4
  • c) 1/5
  • d) 1/3
At series resonance, the impedance of a crystal is________
  • a) minimum
  • b) maximum
  • c) equal
  • d) Zero
The twin-T oscillator produces a ________ response.
  • a) low-pass
  • b) high-pass
  • c) band -pass
  • d) band-stop
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) Lowered frequency response
  • d) Higher input impedance & Better stabilized voltage gain
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