Electronic Devices Question 266

Question: The slopes of anode and mutual characteristics of a triode are 0.02 $mAV^{-1}$ and 1 $mAV^{-1}$ respectively. What is the amplification factor of the valve

[MP PMT 1990]

Options:

A) 5

B) 50

C) 500

D) 0.5

Show Answer

Answer:

Correct Answer: B

Solution:

The slope of anode characteristic curve $ =\frac{1}{r _{p}} $
$ \Rightarrow r _{p}=\frac{1}{0.02mA/V}=50\frac{V}{mA}=50\times 10^{3}\frac{V}{A} $

The slope of mutual characteristic curve = gm = 1 x 10${^3}$ A/V.

$ \therefore \mu =r _{p}\times g _{m}=50\times 10^{3}\times {{10}^{-3}}=50 $ .



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