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Electronics Engineering Objective Questions { Operational Amplifier and Its Applications  }



92. One condition for oscillation is
A. a phase shift around the feedback loop of 180?
B. a gain around the feedback loop of one-third
C. a phase shift around the feedback loop of 0?
D. a gain around the feedback loop of less than 1
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93.  A second condition for oscillations IS
A. a gain of 1 around the feedback loop
B. no gain around the feedback loop
C. the attenuation of the feedback circuit must be one-third
D. the feedback circuit must be capacitive
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94. In a certain oscillator, A, = 50. The attenuation of the feedback circuit must be
A.1
B.0.01
C.10
D.0.02
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95. For an oscillator to properly start, the gain around the feedback loop must initially be
A.1
B. greater than 1
C. less than 1
D. equal to attenuation of feedback circuit
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96.  In a Wien-bridge oscillator, if the resistances in the positive feedback circuit are decreased, the frequency
A. remains the same
B. decreases
C. increases
D. insufficient data
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97. In a Colpitt's oscillator, feedback is obtained
A. by magnetic induction
B. by a tickler coil
C. from the centre of split capacitors
D. none of the above
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98. The Q of a crystal is of the order of
A.100
B.1000
C.50
D. more than 10,000
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