Electronic Devices Question 202

Question: In the circuit of a triode valve, there is no change in the plate current, when the plate potential is increased from 200 volt to 220 volt and the grid potential is decreased from - 0.5 volt to -1.3 volt. The amplification factor of this valve is

[MP PMT 1989]

Options:

A) 15

B) 20

C) 25

D) 35

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Answer:

Correct Answer: C

Solution:

$ \mu =\frac{({V _{p _{1}}}-{V _{p _{2}}}}{({V _{G _{1}}}-{V _{G _{2}}})} $

$ =\frac{(200-220)}{(0.5-1.3)}=25.$



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