An amplifier with loop gain A? will be more stable for value of A? as 0.95 0.7 1

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Question
An amplifier with loop gain A? will be more stable for value of A? as
Options
A. 0.95
B. 0.7
C. 1.2
D. 1.5

Correct Answer

0.7

Explanation

A feedback amplifier is stable if loop gain is less than unity. More less, more stable, hence ? will be more stable.

Analog Electronics problems

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1. The load impedance Z_L of a CE amplifier has R and L in series. The phase difference between output and input will be
Options
A. 180�
B. 0
C. more than 90� but less than 180�
D. more than 180� but less than 270�

3. S_i transistor of following figure has a = 0.9 and I_CE= 0, V_EE = 5 V and V_CC = 13 V, then R_E will be if I_EQ = 1 mA
Options
A. 3 k?
B. 4 k?
C. 5 k?
D. 4.3 k?

6. A bridge rectifier circuit has input of 50 Hz frequency. The load resistance is R_L and filter capacitance is C. For good output wave shape, the time constant R_LC should be at least equal to
Options
A. 10 ms
B. 20 ms
C. 50 ms
D. 100 ms

7. In figure The minimum and maximum load currents are
Options
A. 0 and 60 mA
B. 0 and 120 mA
C. 10 mA and 60 mA
D. 10 mA and 120 mA

9. Consider the following statements : A clamper circuit
1. adds or subtracts a dc voltage to a waveform
2. does not change the waveform
3. amplifiers the waveform
Which are correct?
Options
A. 1, 2
B. 1, 3
C. 1, 2, 3
D. 2, 3

10. Gain of the amplifier is 'A'. Then the I/P impedance and O/P impedance of the closed loop amplifier shown below would be
Options
A.
B.
C.
D.

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