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Draw and discuss Pentode Plate Characteristics.
Ans: Pentode Plate Characteristics: Pentode plate characteristics (plate current-plate voltage curves at constant grid voltage) are portrayed in fig. (a).
1. Characteristics are non-linear below the knee of the curve.
2. Dip noticed in the plate characteristics of a tetrode is eliminated in the pentode plate characteristics. This is because of the suppression effect of suppressor grid.
3. Over the major portion (above the knee) of the characteristics plate current is largely independent of plate voltage. So pentode may be thought as a constant current device. A pentode is generally operated in this region.
Carnot's theorem (S. Carnot) The theorem which states that no engine operating among two temperatures can be more capable than a reversible engine.
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division
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