1
GATE EE 1994
Subjective
+1
-0
Given figure shows a two stage small signal transistor feedback amplifier. Match the defective component (listed on the left hand side below) with its probable effect on the circuit (listed below) GATE EE 1994 Analog Electronics - Feedback Amplifiers and Oscillator Circuits Question 1 English

List - $${\rm I}$$
$$A.$$ Capacitor $${C_1}$$ is open
$$B.$$ Capacitor $${C_3}$$ is open
$$C.$$ Capacitor $${C_4}$$ is open
$$D.$$ $$R{C_2}$$ is shorted

List - $${\rm II}$$
$$P.$$ All $$dc$$ voltages normal, $${V_0}$$ increases marginally
$$Q.$$ Collector of $$T{R_2}$$ at $${V_{cc}},\,\,{V_0} = 0$$
$$R.$$ All $$dc$$ voltages normal, gain of $${2^{nd}}$$ stage decreases, $${V_0}$$ decreases.
$$S.$$ All $$dc$$ voltage normal, $${V_0} = 0$$
$$T.$$ All $$dc$$ voltages normal, overall gain of the amplifier increases, $${V_0}$$ increase
$$U.$$ No change

2
GATE EE 1993
MCQ (More than One Correct Answer)
+1
-0.3
A Wein bridge oscillator is shown in figure. Which of the following statements are true if $$'f'$$ is the frequency of oscillation? GATE EE 1993 Analog Electronics - Feedback Amplifiers and Oscillator Circuits Question 2 English
A
For $$R = 1\,k\Omega ,\,C = {1 \over {2\pi }}\mu F,\,\,f = 1\,kHz$$
B
$$R = 3\,k\Omega ,\,C = {1 \over {18\pi }}\mu F,\,\,f = 3\,kHz$$
C
The gain of the op-amp stage should be less than two for proper operation
D
The gain of the op-amp stage should be three for proper operation
3
GATE EE 1992
MCQ (Single Correct Answer)
+1
-0.3
In a common Emitter amplifier, the un bypassed emitter resistance provides
A
Voltage - shunt feedback
B
Current - Series feedback
C
Negative - Voltage feedback
D
Positive - current feedback
4
GATE EE 1992
MCQ (Single Correct Answer)
+1
-0.3
The voltage series feedback in a feedback amplifier leads to
A
increase in band width, while the voltage gain becomes less sensitive to variations in components and device characteristics
B
decrease in overall gain, while the input resistance decreases
C
increase in distortion, while the output resistance decreases
D
decrease in input resistance, while the output resistance increases
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