DC amplifiers have a tendency to be unstable. True False Due to drift.

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Question
DC amplifiers have a tendency to be unstable.
Options
A. True
B. False

Correct Answer

True

Explanation

Due to drift.

Analog Electronics problems

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2. In figure, V_EB = 0.6 V, ? = 99. Then V_C and I_C are
Options
A. 9.3 V and 1.98 mA respectively
B. 4.6 V and 1.98 mA respectively
C. 9.3 V and 0.02 mA respectively
D. 4.6 V and 0.02 mA respectively

3. Assertion (A): For large signal variations an amplifier circuit has to be analysed graphically
Reason (R): The output characteristics of a transistor is nonlinear.
Options
A. Both A and R are correct and R is correct explanation for A
B. Both A and R are correct but R is not correct explanation for A
C. A is correct R is wrong
D. A is wrong R is correct

4. In class C operation of an amplifier circuit, the collector current exists for
Options
A. 360� of input wave
B. 180� of input wave
C. more than 180� of input wave
D. less than 180� of input wave

6. Study the circuit of figure and examine the following statements
1. It is an active low pass finer.
2. It is a second order filter.
3. The change in gain is 40 dB/decade.
Which of the above statements are correct?
Options
A. 1, 2 and 3
B. 1 and 2
C. 1 and 3
D. 2 and 3

7. The 'h' parameters of the circuit shown in the figure are h_ib = 25 ?, h_fb = 0.999 and h_ob = 10^-6? The Voltage gain is
Options
A. 0.99
B. 1.98
C. 2.0
D. 4

8. A forward voltage of 9 V is applied to a diode in series with a 1 k? load resistor. The voltage across load resistor is zero. It indicates that
Options
A. diode is short circuited
B. diode is open circuited
C. resistor is open circuited
D. diode is either short circuited or open circuited

9. To prevent a DC return between source and load, it is necessary to use
Options
A. resistor between source and load
B. inductor between source and load
C. capacitor between source and load
D. either (a) or (b)

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