Semiconducting Devices Question 62
Question: A change of 0.8 mA in the anode current of a triode occurs when the anode potential is changed by 10 V. If m = 8 for the triode, then what change in the grid voltage would be required to produce a change of 4 mA in the anode current
Options:
A) 6.25 V
B) 0.16 V
C) 15.2 V
D) None of these
Show Answer
Answer:
Correct Answer: A
Solution:
The first data gives value of plate resistance $ r _{p}=\frac{\Delta V _{p}}{\Delta i _{p}}=\frac{10}{0.8\times {{10}^{-3}}}=\frac{10^{5}}{8}\Omega $
Also $ g _{m}=\frac{\Delta i _{p}}{\Delta V _{g}} $ and $ g _{m}=\frac{\mu }{r _{p}} $
Therefore $ \Delta V _{g}=\frac{\Delta i _{p}\times r _{p}}{\mu }=\frac{4\times {{10}^{-3}}\times 10^{5}/8}{8}=6.25V $
