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.

• A. 15
• B. 20
• C. 25
• D. 35

Answer 1

Answer: (C)

25

Answer 2

$\mu = \frac{(V_{p_{1}} - V_{p_{2}}}{(V_{G_{1}} - V_{G_{2}})} = \frac{(200 - 220)}{(0.5 - 1.3)} = 25.$