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ESE 2021 Technical Quiz: Oscillators & feedback amplifiers

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Question 1

In a sinusoidal oscillator, sustained oscillations will be produced only if the loop gain (at the oscillation frequency) is

Question 2

Consider the following statements regarding Wien Bridge oscillator:
1) It has a larger bandwidth than the phase shift oscillator.
2) It has a smaller bandwidth than the phase shift oscillator.
3) It has 2 capacitors while the phase shift oscillator has 3 capacitors.
4) It has 3 capacitors while the phase shift oscillator has 2 capacitors.
Which of the above statements are correct?

Question 3

For 555 astable multivibrator, if C = 0.01 μF, RA = 10 kΩ, RB = 50 kΩ, the frequency and the duty cycle will be nearly

Question 4

The nature of feedback in the op-amp circuit shown is

Question 5

An amplifier has an open loop gain of 50 and input impedance 2 kΩ and output impedance 500 Ω. If negative feedback with feedback factors 0.8 is connected in current series feedback. The new input and output impedances are
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Jul 5ESE & GATE EE