Electronic Devices and Circuit Theory-Oscillator Circuits Questions and Answers

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Showing 10 of 40 questions
Q31
The frequency distortion arising because of varying amplifier gain with frequency is considerably reduced in a negative-voltage feedback amplifier circuit.
  • A True
  • B False
Answer: Option A
Q32
The feedback network in a Colpitts oscillator contains two series capacitors and a parallel inductor.
  • A TRUE
  • B FALSE
Answer: Option A
Q33
The positive feedback voltage in an oscillator has no net phase shift.
  • A TRUE
  • B FALSE
Answer: Option A
Q34
Crystal oscillators are inherently unstable.
  • A TRUE
  • B FALSE
Answer: Option B
Q35
For a Wien-bridge oscillator, resonance occurs when Vout/Vin = 1.
  • A True
  • B False
Answer: Option B
Q36
LC feedback elements are normally used in oscillators for frequencies greater than 1 MHz.
  • A TRUE
  • B FALSE
Answer: Option A
Q37
The frequency in a VCO can be varied with a DC voltage.
  • A TRUE
  • B FALSE
Answer: Option A
Q38
Oscillators operate on negative feedback.
  • A TRUE
  • B FALSE
Answer: Option B
Q39
The feedback signal in a Hartley oscillator is derived from an inductive voltage in the tank circuit.
  • A TRUE
  • B FALSE
Answer: Option A
Q40
In the astable mode, a 555 timer is connected as a free-running relaxation oscillator.
  • A TRUE
  • B FALSE
Answer: Option A

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