Question

The plate current in a triode valve is zero. The temperature of the filament is high. It is possible that
(a) Vg > 0, Vp > 0
(b) Vg > 0, Vp < 0
(c) Vg < 0, Vp > 0
(d) Vg < 0, Vp < 0

Answer 1

The answers are (c) Vg < 0, Vp > 0, (b) Vg > 0, Vp < 0 and (d) Vg < 0, Vp < 0.

EXPLANATION:

• When the filament’s temperature is high, then there will be an emission of electrons. In the diode, for the plate current, other conditions are:

• (1) Positive grid voltage denoted as Vg

• (2) Positive plate voltage denoted as VP

• In a triode, the plate current will be zero if any of the conditions is not satisfied.

Answer 2

Explanation:

option c is the correct answer