In an experiment to study the input characteristics of NPN transistor operating in common emitter mode, which of the following is true?*2 pointsInput characteristics is a plot between Collector-emitter voltage and collector current. And base current is measured using Ammeter having range from 0 microampere to 200 microamperes.Input characteristics is a plot between base-emitter voltage and base current. Knee voltage decreases with increase in collector emitter voltage.Input characteristics is a plot between collector-emitter voltage and base current. And base current is measured using Ammeter having range 0 mA to 200 mA.Input characteristics is a plot between base-emitter voltage and base current. And the base current is measured using Ammeter having range from 0 mA to 200 mA.
Question
In an experiment to study the input characteristics of NPN transistor operating in common emitter mode, which of the following is true?*2 pointsInput characteristics is a plot between Collector-emitter voltage and collector current. And base current is measured using Ammeter having range from 0 microampere to 200 microamperes.Input characteristics is a plot between base-emitter voltage and base current. Knee voltage decreases with increase in collector emitter voltage.Input characteristics is a plot between collector-emitter voltage and base current. And base current is measured using Ammeter having range 0 mA to 200 mA.Input characteristics is a plot between base-emitter voltage and base current. And the base current is measured using Ammeter having range from 0 mA to 200 mA.
Solution
The correct answer is: "Input characteristics is a plot between base-emitter voltage and base current. Knee voltage decreases with increase in collector emitter voltage."
In a common emitter NPN transistor, the input characteristics are studied by plotting a graph between the base-emitter voltage (Vbe) and the base current (Ib). The knee voltage, which is the voltage at which the transistor starts to conduct, decreases with an increase in the collector-emitter voltage. This is because as the collector-emitter voltage increases, the barrier potential decreases, allowing more current to flow.
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