Electronic Devices Question 216

Question: The transconductance of a triode amplifier is 2.5 mili mho having plate resistance of 20 KW, amplification 10. Find the load resistance

[RPMT 2001]

Options:

A) 5 kW

B) 25 kW

C) 20 kW

D) 50 kW

Show Answer

Answer:

Correct Answer: A

Solution:

Voltage amplification $ A _{v}=\frac{\mu }{1+\frac{r _{p}}{R _{L}}}=\frac{r _{p}\times g _{m}\times R _{L}}{R _{L}+r _{p}} $
$ \Rightarrow 10=\frac{20\times 10^{3}\times 2.5\times {{10}^{-3}}\times R _{L}}{(R _{L}+20\times 10^{3})} $
$ \Rightarrow R _{L}=5k\Omega $ .



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