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 :

1. 15 and 200

2. 150 and 15000

3. 20 and 2000

4. 200 and 1000

Doubtly Asked 30 Oct 2026 NEET UG 2017 neet Save WhatsApp Report

1 answer

Best answer

Answer: 2. 150 and 15000

Key idea: in a common emitter amplifier, voltage gain \(A_v=\beta\dfrac{R_C}{R_B}\) and power gain \(=\beta A_v\).

\(A_v=100\times\dfrac{3\ \text{k}\Omega}{2\ \text{k}\Omega}=150\).

Power gain \(=\beta\times A_v=100\times150=15000\).

So voltage gain is 150 and power gain 15000.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

Was this answer helpful?