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Chapter 20: Problem 1

The \(P-N\) junction diode is used as (A) An amplifier (B) A rectifier (C) An oscillator (D) A modulator

Short Answer

Expert verified
The primary function of a P-N junction diode is to act as a rectifier, which is used to convert an alternating current (AC) signal to a direct current (DC) signal. Therefore, the correct answer is (B) A rectifier.

Step by step solution

01

Identify the Function of a P-N Junction Diode

A P-N junction diode is a semiconductor device made of two dissimilar materials, a P-type semiconductor and an N-type semiconductor, joined together. It allows the current to flow in one direction (from P to N) but blocks the current in the opposite direction (from N to P). Now let's analyze each option:
02

Option (A): An amplifier

An amplifier is a device that is used to increase the amplitude or strength of input signals. A P-N junction diode does not have any amplification properties. So, a P-N junction diode is not used as an amplifier.
03

Option (B): A rectifier

A rectifier is a device that is used to convert an alternating current (AC) signal to a direct current (DC) signal. A P-N junction diode allows current to flow in only one direction, making it an ideal component in the rectification process. So, P-N junction diodes can be used as rectifiers.
04

Option (C): An oscillator

An oscillator is a device that generates a periodic or oscillating electronic signal, such as a sine wave or a square wave. A P-N diode is not suitable for generating oscillating signals. So, a P-N junction diode is not used as an oscillator.
05

Option (D): A modulator

A modulator is a device that is used to change the properties of a carrier signal (such as amplitude, frequency, or phase) in accordance with an input message signal. A P-N junction diode cannot modulate the properties of input signals. So, a P-N junction diode is not used as a modulator. Given these options, we can conclude that a P-N junction diode is primarily used for: (B) A rectifier

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Most popular questions from this chapter

The part of a transistor which is most heavily doped to produce large number of majority carriers is: [2002] (A) Emitter (B) Base (C) Collector (D) Can be any of the above three.

When \(N P N\) transistor is used as an amplifier (A) electrons move from base to collector. (B) holes move from emitter to base. (C) electrons move from collector to base. (D) holes move from base to emitter.

In a transistor, the emitter-base junction and the collector-base junction are (A) forward and forward biased respectively. (B) reverse and reverse biased respectively. (C) reverse and forward biased respectively. (D) forward and reverse biased respectively.

Which one of the following statements is not correct? (A) A diode does not obey Ohm's law (B) A \(P-N\) junction diode symbol shows an arrow identifying the direction of current (forward) flow (C) An ideal diode is an open switch (D) An ideal diode is an ideal one way conductor

Two \(P-N\) junctions can be connected in series by three different methods as shown in the Fig. \(20.5\). If the potential difference in the junctions is the same, then the correct connections will be (A) In the circuit (1) and (2) (B) In the circuit (2) and (3) (C) In the circuit (1) and (3) (D) Only in the circuit (1)
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