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MCQs

Total Questions : 28 | Page 3 of 3 pages
Question 21. In Colpitt's oscillator, feedback is obtained ___________
  1.    By magnetic induction
  2.    By a tickler coil
  3.    From the centre of split capacitors
  4.    None of the above
 Discuss Question
Answer: Option C. -> From the centre of split capacitors
Question 22. For an oscillator to properly start, the gain around the feedback loop must initially be
  1.    1
  2.    Greater than 1
  3.    Less than 1
  4.    Equal to attenuation of feedback circuit
 Discuss Question
Answer: Option B. -> Greater than 1
Question 23. The Q of the crystal is of the order of ___________
  1.    100
  2.    1000
  3.    50
  4.    More than 10,000
 Discuss Question
Answer: Option D. -> More than 10,000
Question 24. If the crystal frequency changes with temperature, we say that crystal has ___________ temperature coefficient
  1.    Positive
  2.    Zero
  3.    Negative
  4.    None of the above
 Discuss Question
Answer: Option A. -> Positive
Question 25. In a Wien-bridge oscillator, if the resistances in the positive feedback circuit are decreased, the frequency ___________
  1.    Remains the same
  2.    Decreases
  3.    Increases
  4.    Insufficient data
 Discuss Question
Answer: Option C. -> Increases
Question 26. A second condition for oscillations is ___________
  1.    A gain of 1 around the feedback loop
  2.    No gain around the feedback loop
  3.    The attention of the feedback circuit must be one-third
  4.    The feedback circuit must be capacitive
 Discuss Question
Answer: Option A. -> A gain of 1 around the feedback loop
Question 27. In an LC oscillator, if the value of L is increased four times, the frequency of oscillations is ___________
  1.    Increased 2 times
  2.    Decreased 4 times
  3.    Increased 4 times
  4.    Decreased 2 times
 Discuss Question
Answer: Option D. -> Decreased 2 times
Question 28. The piezoelectric effect in a crystal is ___________
  1.    A voltage developed because of mechanical stress
  2.    A change in resistance because of temperature
  3.    A change in frequency because of temperature
  4.    None of the above
 Discuss Question
Answer: Option A. -> A voltage developed because of mechanical stress

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