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

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Solution

(b) V_g > 0, V_p < 0
(c) V_g < 0, V_p > 0
(d) V_g < 0, V_p < 0

If the temperature of the filament is high, then it will emit electrons. Other conditions for the plate current in the diode are:
(1) Positive grid voltage, V_g
(2) Positive plate voltage, V_P
If any of the above conditions is not satisfied, then plate current in a triode will be zero.

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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

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