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Analog Electronics problems

1. In a BJT circuit a pnp transistor is replaced by npn transistor. To analyse the new circuit
Options
A. all calculations done earlier have to be repeated
B. replace all calculated voltages by reverse values
C. replace all calculated currents by reverse values
D. replace all calculated voltages and currents by reverse values

2. An amplifier has a large ac input signal. The clipping occurs on both the peaks. The output voltage will be nearly a
Options
A. sine wave
B. square wave
C. triangular wave
D. (a) or (c)

3. If an amplifier with gain of - 1000 and feedback factor ? = - 0.1 had a gain change of 20% due to temperature, the change in gain of the feedback amplifier would be
Options
A. 10%
B. 5%
C. 0.2%
D. 0.01%

5. To protect the diodes in a rectifier and capacitor input filter circuit it is necessary to use
Options
A. surge resistor
B. surge inductor
C. surge capacitor
D. both (a) and (b)

6. In figure v₁ = 8 V and v₂ = 4 V. Which diode will conduct?
Options
A. D₂ only
B. D₁ only
C. Both D₁ and D₂
D. Neither D₁ nor D₂

8. A half wave diode rectifier has a capacitance input filter. If input voltage is V_m sin ?t, PIV is
Options
A. V_m
B. 2 V_m
C. 3 V_m
D. 4 V_m

9. The efficiency of a full wave rectifier using centre tapped transformer is twice that in full wave bridge rectifier.
Options
A. True
B. False

10. The transistor of following figure in Si diode with a base current of 40 ?A and I_CBO = 0, if V_BB = 6V, R_E = 2 k? and ? = 90, I_BQ = 20 ?A then R_B =
Options
A. 200 k?
B. 265 k?
C. 150 k?
D. 100 k?

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