Question

The emitter-base junction of a transistor is__________ biased while the collector-base junction is ____________ biased.
A. Reverse, forward
B. Reverse, reverse
C. Forward, forward
D. Forward, reverse

Answer 1

Hint: Transistor is a semiconductor device used to amplify or switch electrons signals and electron power. In the n-p-n transistor the emitter base is forward and the collector base is reversed in the n-p-n junction diode.

Complete answer:
 Consider an n-p-n transistor,

In the above figure, the base is connected to the p transistor, whereas collector and emitter are connected to the n transistor. In base emitter transistors the current is flowing forward biased, whereas, in collector and emitter transistors the current is passing in reverse biased.Thus, the emitter-base junction is forward biased and collector-base junction is reverse biased.

The correct answer is option D.

Additional information: In n-p-n transistor, there are three terminals namely base, emitter and collector. In this transistor the flow of electrons is from emitter to collector, the base diode is slightly doped, the emitter diode is moderately doped and the collector diode is heavily doped. Base is the most important factor in n-p-n transistors.

In an n-p-n transistor is the movement of negative electrons, through the base region which constitute transistor action. Emitter base injects a large amount of charge carrier to the base. Section which collects the majority of charge carriers and supplied by the emitter is called collector. Emitter size is more than base but less than the collector.

Note: : In n-p-n emitter to base causes the flow of electron to n type. Biasing to the transistor ensures that it operates in the active region. The emitter base is forward biased in the n-p-n transistor; the collector base is reversed biased in the n-p-n transistor.