Department of Pre-University Education, KarnatakaPUC Karnataka Science Class 12
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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 - Physics

ConceptConcept of Semiconductor Electronics: Materials, Devices and Simple Circuits

#### 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

#### Solution

(b) Vg > 0, Vp < 0
(c) Vg < 0, Vp > 0
(d) Vg < 0, Vp < 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, Vg
(2) Positive plate voltage, VP
If any of the above conditions is not satisfied, then plate current in a triode will be zero.

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#### APPEARS IN

Solution 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 Concept: Concept of Semiconductor Electronics: Materials, Devices and Simple Circuits.
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