Q. In a common emitter transistor amplifier the audio signal voltage across the collector is 3 V. The resistance of collector is 3 kΩ. If current gain is 100 and the base resistance is 2 kΩ, the voltage and power gain of the amplifier is :
A) 200 and 1000
B) 15 and 200
C) 150 and 15000
D) 20 and 2000
Explanation
[Solution] $A_v = \beta R_C/R_B = 100 \times 3/2 = 150$; power gain $= \beta A_v = 15000$. Answer (3).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.