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 $ .
