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MCQs

Total Questions : 28 | Page 2 of 3 pages
Question 11. A Wien bridge oscillator uses ___________ feedback
  1.    Only positive
  2.    Only negative
  3.    Both positive and negative
  4.    None of the above
 Discuss Question
Answer: Option C. -> Both positive and negative
Question 12. An oscillator differs from an amplifier because it
  1.    Has more gain
  2.    Requires no input signal
  3.    Requires no d.c. supply
  4.    Always has the same input
 Discuss Question
Answer: Option B. -> Requires no input signal
Question 13. One condition for oscillation is ___________
  1.    A phase shift around the feedback loop of 180°
  2.    A gain around the feedback loop of one-third
  3.    A phase shift around the feedback loop of 0°
  4.    A gain around the feedback loop of less than 1
 Discuss Question
Answer: Option C. -> A phase shift around the feedback loop of 0°
Question 14. An oscillator converts ___________
  1.    a.c. power into d.c. power
  2.    d.c. power into a.c. power
  3.    mechanical power into a.c. power
  4.    none of the above
 Discuss Question
Answer: Option B. -> d.c. power into a.c. power
Question 15. In a phase shift oscillator, the frequency determining elements are ___________
  1.    L and C
  2.    R, L and C
  3.    R and C
  4.    None of the above
 Discuss Question
Answer: Option C. -> R and C
Question 16. In an LC transistor oscillator, the active device is ___________
  1.    LC tank circuit
  2.    Biasing circuit
  3.    Transistor
  4.    None of the above
 Discuss Question
Answer: Option C. -> Transistor
Question 17. ___________ is a fixed frequency oscillator
  1.    Phase-shift oscillator
  2.    Hartely-oscillator
  3.    Colpitt's oscillator
  4.    Crystal oscillator
 Discuss Question
Answer: Option D. -> Crystal oscillator
Question 18. The application where one would most likely find a crystal oscillator is ___________
  1.    Radio receiver
  2.    Radio transmitter
  3.    AF sweep generator
  4.    None of the above
 Discuss Question
Answer: Option B. -> Radio transmitter
Question 19. In an LC circuit, when the capacitor is maximum, the inductor energy is ___________
  1.    Minimum
  2.    Maximum
  3.    Half-way between maximum and minimum
  4.    None of the above
 Discuss Question
Answer: Option A. -> Minimum
Question 20. An important limitation of a crystal oscillator is ___________
  1.    Its low output
  2.    Its high Q
  3.    Less availability of quartz crystal
  4.    Its high output
 Discuss Question
Answer: Option A. -> Its low output

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