1
GATE EE 2001
MCQ (Single Correct Answer)
+1
-0.3
An op-amp has an open-loop gain of $${10^5}$$ and an open-loop upper cutoff frequency of $$10$$ $$Hz.$$ If this op-amp is connected as an amplifier with a closed-loop gain of $$100,$$ then the new upper cutoff frequency is
A
$$10$$ $$Hz$$
B
$$100$$ $$Hz$$
C
$$10$$ $$kHz$$
D
$$100$$ $$kHz$$
2
GATE EE 1994
True or False
+1
-0
A practical $$R$$-$$C$$ sinusoidal oscillator is built using a positive feedback amplifier with a closed loop gain slightly less than unity.
A
TRUE
B
FALSE
3
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

4
GATE EE 1993
MCQ (More than One Correct Answer)
+1
-0
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
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