Electronic Devices and Circuit Theory-Oscillator Circuits

Electronic Devices and Circuit Theory-Oscillator Circuits
31. The frequency distortion arising because of varying amplifier gain with frequency is considerably reduced in a negative-voltage feedback amplifier circuit.
  • True
  • False
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32. The feedback network in a Colpitts oscillator contains two series capacitors and a parallel inductor.
  • TRUE
  • FALSE
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33. The positive feedback voltage in an oscillator has no net phase shift.
  • TRUE
  • FALSE
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34. Crystal oscillators are inherently unstable.
  • TRUE
  • FALSE
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35. For a Wien-bridge oscillator, resonance occurs when Vout/Vin = 1.
  • True
  • False
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36. LC feedback elements are normally used in oscillators for frequencies greater than 1 MHz.
  • TRUE
  • FALSE
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37. The frequency in a VCO can be varied with a DC voltage.
  • TRUE
  • FALSE
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38. Oscillators operate on negative feedback.
  • TRUE
  • FALSE
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39. The feedback signal in a Hartley oscillator is derived from an inductive voltage in the tank circuit.
  • TRUE
  • FALSE
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40. In the astable mode, a 555 timer is connected as a free-running relaxation oscillator.
  • TRUE
  • FALSE
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Electronics
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