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Q.

In a single state transistor amplifier, when the signal changes by 0.02 V, the base current change by 10μA  and collector current by 1 mA. If collector load RC=2kΩ  and RL=10kΩ , Calculate Current gain, Input impedance, Effective a.c. load, Voltage gain and power gain.

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a

50,2KΩ,1.66KΩ,83,8300

b

100,1KΩ,1.66KΩ,83,8300

c

100,2KΩ,1.66KΩ,83,830

d

100,2KΩ,1.66KΩ,83,8300

answer is D.

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Detailed Solution

(i) Current Gain  β=δicδib=100010=100 (ii) Input impedance  Ri=δVBEδib=0.0210=0.002μΩ=2kΩ(iii) Effective(ac)load RAC=RCRLRC+RL=2(10)2+10=1.66kΩ(iv) Voltage gain  AV=β×RACRin=100×1.662=83.33(v) Power gain, AP=AV×β=83.33×100=8333
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