Analog Electronics - ECE Questions and Answers

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According to Barkhausen criteria in order to sustain the oscillations

loop gain of the circuit must be negligible

loop gain of the circuit must be equal to unity

the phase shift around the circuit must be 180°

none of the above

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A Wien bridge oscillator uses

negative feedback

positive feedback

both negative and positive feedback

none of the above

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In the above case, what will be the value of capacitor to obtain 100 kHz frequency?

0.0065 pF

0.0130 pF

0.0260 pF

0.520 pF

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Equal amplitude ac signals are given as inputs to both inverting and given as inputs to both inverting and non-inverting terminals of an op-amp. The output will be zero when the phase difference between inputs is

0°

90°

180°

270°

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Which of the following can be used to isolate a low impedance from a high impedance source?

Emitter follower

p filter

Darlington pair

Any of the above

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A class C amplifier uses

high Q tuned circuit

low Q tuned circuit

untuned circuit

either (b) or (c)

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In figure

the collector currents of T₁ and T₂ are equal

the collector current of T₁ is more than that of T₂

the collector current of T₁ is double that of T₂

the collector currents of T₂ is more than that of T₁

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A three-section RC phase shift oscillator has R = 10K ohms and C = 0.001 μF. If the oscillator is to be made variable using the same value of R, what should be the value of capacitor to obtain a frequency if 1 kHz?

636 pF

180 pF

65 pF

30 pF