Semiconducting Devices Question 272
Question: For a triode $ r _{p}=10 $ kilo ohm and $ g _{m}=3 $ milli mho. If the load resistance is double of plate resistance, then the value of voltage gain will be
[RPMT 1994]
Options:
A) 10
B) 20
C) 15
D) 30
Show Answer
Answer:
Correct Answer: B
Solution:
Voltage gain $ A _{V}=\frac{\mu }{1+\frac{r _{p}}{R _{L}}} $ and $ \mu =r _{p}\times g _{m} $
$ \Rightarrow \mu =10\times 10^{3}\times 3\times {{10}^{-3}}=30 $
$ \therefore A _{v}=\frac{\mu }{1+\frac{r _{p}}{2r _{p}}}=\frac{2}{3}\mu =\frac{2}{3}\times 30=20.$
