Semiconductor and Transistor-Important Questions & Preparation Tips

In this article you will get the clue that from where and how the questions are being framed from the topic Semiconductor and transistor
The experts of jagranjosh.com have full confidence that you will not miss any of the questions in the board exam as well as in competitive exams from this chapter if you will keep the following terms / question in your mind while studying.

Semiconductor and transistor

Characteristics of semiconductor

CRT and LCD

Use and chemical name of galena

Band theory of solids

Types of semiconductor

Application of junction diode as rectifier

What is doping?
Relation between number of electrons, number of holes and number density of intrinsic carrier for a doped semi conductor
At absolute zero temperature a pure semi conductor behaves as insulator. Why?

Relation between conductivity and mobility

What is semi conductor diode?

Effect of heat on depletion layer and then the effect on barrier potential

Symbols of diodes in forward and reverse bias

Diagrammatic study of P-N junction diode in reversed and forward bias condition

Depletion layer

Junction resistance

Graph between resistance and voltage

Current due to diffusion and current due to drift

Relation between free electron and temperature

Ratio of current in forward bias and current in reverse bias

Main function of transistor in amplification

n-p-n and p-n-p transistor(which one is better and why?)

Parts which works as emitter ,base and collector

Order of doping and size for emitter ,base and collector

What is active situation?

Schematic representations of (a) n-p-n transistor and p-n-p transistor, and (b) Symbols for n-p-n and p-n-p transistors. Relation between Ic, Ib and Ie

Current transfer ratio current amplification ratio

Current gain, voltage gain and power gain in common base amplifier and in common emitter amplifier

Relation between current transfer ratio and current amplification ratio

Zener diode and its I-V graph

Zener diode as voltage regulator

Feedback amplifier and transistor oscillator

Analogue signal and digital signal

Truth table of various logic gates

What is Monolithic Integrated Circuit?

Sample questions:

Q1. Why is a Zener diode considered as a special purpose semiconductor diode?

Q2. Draw the I - v characteristics of a Zener diode and explain briefly how reverse current suddenly increases at the breakdown voltage.

Q3. Describe briefly with the help or a circuit diagram how a zener diode works to obtain a constant dc voltage from the unregulated dc output of a rectifier.

Q4.  Describe briefly, with the help of a diagram, the role of the two important processes involved in the formation of a p-n junction.

Q5. Name the device which is used as a voltage regulator. Draw the necessary circuit diagram and explain its working.

Q6. When the base current in a transistor is changed from 30µA to 80µA, the collector current is changed from 1.0mA to 3.5mA. Find the A.C.current amplification factor

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