Oscillator MCQs

31. Oscillators are widely used in

  1. Radio broadcasting
  2. Television broadcasting
  3. Radio and television receiver
  4. All of these

Answer. d

32. If you need to design a relaxation oscillator circuit. The most likely device to use might be

  1. A SCR
  2. A UJT
  3. A TRIAC
  4. All of these

Answer. b

33. Crystal oscillator uses

  1. Silicon crystal
  2. Germanium crystal
  3. Crystal diode
  4. Piezo-electric quartz crystal

Answer. d

34. For audio applications, which of the following is most common oscillator

  1. Crystal oscillator
  2. LC oscillator
  3. RC oscillator
  4. None of these

Answer. c

35. Frequency of oscillation of Colpitts oscillator is given by

  1.  f_o=\frac{1}{2\pi\sqrt{\frac{L}{C_{eq}}}}
  2. f_o=\frac{1}{2\pi\sqrt{LC_{eq}}}
  3. f_o=\frac{1}{2\pi\sqrt{\frac{C_{eq}}{L}}}
  4. None of these

Answer. b

36. The frequency of oscillations of a phase shift oscillator is

  1.  \frac{1}{2\pi RC\sqrt{6}}
  2. \frac{1}{2\pi\sqrt{6RC}}
  3. \frac{1}{2\pi\sqrt{RC}}
  4. \frac{1}{2\pi RC}

Answer. a

37. Which of the following is the fixed frequency oscillator?

  1. Colpitts
  2. Crystal
  3. Hartley
  4. Wien bridge

Answer. b

38. Colpitt’s oscillator works in ___________ mode.

  1. Class A
  2. Class B
  3. Class C
  4. Class AB

Answer. c

39. Crystal oscillator is a constant frequency oscillator due to

  1. Rigidity
  2. Vibrations
  3. Low Q 
  4. High Q

Answer. d

40. A hartley oscillator generates

  1. very low frequency oscillation
  2. radio-frequency oscillation
  3. microwave oscillation
  4. audio-frequency oscillation

Answer. b

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