The transistor of following figure in Si diode with a base current of 40 ?A and

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Question
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?

Correct Answer

265 k?

Explanation

The transistor of following figure in Si diode with a base current of 40 ?A and ICBO = 0, if VBB = 6

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Analog Electronics problems

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

2. 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

4. 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

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. If the input to the ideal comparator shown in the figure is a sinusoidal signal of 8 V (peak to peak) without any DC component, then the output of the comparator has a duty cycle of
Options
A. 1/2
B. 1/3
C. 1/6
D. 1/12

7. For a system to work, as oscillator the total phase shift of the loop gain must be equal to
Options
A. 90�
B. 45�
C. 270�
D. 360�

8. The input impedance of op-amp circuit of figure is
Options
A. 120 k ohm
B. 110 k ohm
C. infinity
D. 10 k ohm

9. An RC coupled amplifier has an open loop gain of 200 and a lower cutoff frequency of 50 Hz. If negative feedback with ? = 0.1 is used, the lower cut off frequency will be
Options
A. about 50 Hz
B. about 5 Hz
C. about 2.38 Hz
D. about 70.5 Hz

10. For a base current of 10 ?A, what is the value of collector current in common emitter if ?_dc = 100
Options
A. 10 ?A
B. 100 ?A
C. 1 mA
D. 10 mA

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