Question

A triode valve has an amplification factor of 20 and its plate is given a potential of 300 V. The grid-voltage to reduce the plate current to zero, is :

• A. 25V
• B. 15V
• C. 12V
• D. 10 V

Answer 1

Answer: (B)

15V

Answer 2

The grid potential required to make plate current zero is given by ${{V}_{g}}=\frac{{{V}_{p}}}{\mu }$ Given, ${{V}_{p}}=300\,V,\,\mu =20$ $\therefore$ ${{V}_{g}}=\frac{300}{20}=15\,V$