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NEET 2010
Exam
NEET
Year
2010
Subject
Physics
Chapter
Semiconductors

NEET 2010 · Physics · Semiconductors

A common emitter amplifier has a voltage gain of 50 , an input...

A common emitter amplifier has a voltage gain of 50 , an input impedance of 100Ω100 \Omega and an output impedance of 200Ω200 \Omega. The power gain the amplifier is

Options

  1. A500
  2. B1000
  3. C1250
  4. D50

Correct answer

C. 1250

Step-by-step solution

Voltage gain =β×=\beta \times impedance gain \Rightarrow \quad 50=β×200100⇒β=\beta \times \frac{200}{100} \Rightarrow \beta=25 Also, power gain =β2×=\beta^2 \times impedance gain =(25)^2 ×200100=\times \frac{200}{100}=1250
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