Oscillators – Exercise – 2

61. Which of the following improvements is (are) a result of the negative feedback in a circuit?

(a) Higher input impedance
(b) Better stabilized voltage gain
(c) Improved frequency response
(d) All of the above

Answer
Answer : (d)
Explanation
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62. Which of the following is (are) feedback?

(a) Voltage-series
(b) Voltage-shunt
(c) Current-series
(d) All of the above

Answer
Answer : (d)
Explanation
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63. Nota

64. At what phase shift is the magnitude of βA at its minimum in the Nyquist plot?

(a) 90º
(b) 180º
(c) 270º
(d)

Answer
Answer : (d)
Explanation
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65. Which of the following is required for oscillation?

(a) β A > 1
(b) The phase shift around the feedback network must be 180º.
(c) Both βA > 1 and the phase shift around the feedback network must be 180º.
(d) None of the above

Answer
Answer : (c)
Explanation
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