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What is meant by stabilization in transistor?

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What is thermal runaway of a transistor?

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What is the main use of a transistor?

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Main use of a transistor as amplifier and as switch.

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What is self biasing of transistor?

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What do you mean by biasing of a transistor?

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Why biasing is required for a transistor?

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What is role of HFE in transistor ?

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Explain working of n-p-n transistor in unbiased condition.

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Construction of NPN transistor: For an unbiased transistor no external power supplies are connected to it. Base is sandwiched between collector & emitter terminal. It is thin & lightly doped ... providing external power supply to transistor & this process is known as Biasing.

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Compare P.N.P and N.P.N transistor.

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Parameter PNP transistor NPN transistor Definition Two blocks of p- types semiconductors are separated by one thin block of n-type semiconductor. Transistor in which two ntype layer ... Positive Voltage  Emitter Terminal Collector Terminal Ground Signal High Low

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Draw construction of SCR using two transistor model. Explain its operation.

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Two Transistor Model of SCR or Thyristor

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Draw the V-I characteristics of power transistor. 

Answer :

V-I characteristics of power transistor:

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Describe thermal runaway of transistor and explain how it can be avoided.

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Concept of thermal runaway:  1.We know that  IC = β IB + (1+ β) ICO  Where ICO is the leakage current and ICO is strongly dependent on temperature. 2. Leakage current approximately doubles for ...   Thermal runaway can be avoided by : 1) Using stabilization circuitry 2) Heat sink 

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Define α and β of the transistor. 

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α: The ratio of collector current IC to emitter current IE for a constant collector to base voltage VCB in the CB configuration is called current gain alpha (α).   β : The ratio of collector ... a constant collector to emitter voltage VCE in the CE configuration is called current gain beta (β) .

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Description :

List various transistor biasing methods.

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Types of biasing methods: i. Base bias (or fixed bias) ii. Base bias with emitter feedback. iii. Base bias with collector feedback iv. Voltage divider bias (or self bias) v. Emitter bias. 

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Transistor operating configurations

Answer :

Transistor operating configurations

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Define junction field effect transistor (JFET) and give an example.

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Junction Field-Effect Transistor: It is a semiconductor device having three terminals, namely Gate, Drain and Source, in which the current flow is controlled by an electric field set up by an external voltage applied ... : i) n-channel JFET and ii) p-channel JFET Examples of JFET: BFW 10, BFW 11 

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Description :

Define α & β and derive the relation between (α) &) (β) of transistor.

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α : The ratio of output collector current IC to input emitter current IE in the CB configuration is called current gain alpha (α).  β : The ratio of output collector current IC to the input base current IB in the CE configuration is ... ( 1/β) + 1  hence 1/ α = (1+β )/ β  Therefore, α = β /(1+β)

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Define biasing of transistor

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Biasing of transistor is the process that makes the base emitter junction of transistor always forward biased and collector junction reverse biased for achieving the faithful amplification .

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With neat diagram explain working of NPN transistor.

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N-p-n transistor is made by sandwiching thin layer of p-type semiconductor between two layers of n-type semiconductor. It has three terminals - Emitter, Base and collector. The npn transistor has two ... up in the collector as it is more positive. In this way, current flows in the transistor.

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Draw and explain self-basing of a transistor.

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Transistor Biasing is the process of setting a transistors DC operating voltage or current conditions to the correct level so that any AC input signal can be amplified correctly by the transistor. ExplanationIt ... Applying KVL to o/p loop , Collector-emitter voltage, VCE = VCC − IC RC

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Compare between CB , CE & CC transistor configuration.

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Parameter CB CE CC I/P impedance Low Or 50Ω Medium Or 600Ωto 4kΩ High Or 1 MΩ Current Gain Less than or equal to 1 High Highest Voltage Gain Medium Medium Less ... k Ω to 50 k Ω Low Or 50 Ω Phase shift between input and output 0° 360° 0° 

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Why transistor is called as bipolar device.

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BJT is called bipolar device because in BJT current conduction takes place due to majority as well as minority charge carriers that is because of electrons as well as holes.

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What is meant by distortion in amplifiers?

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ICB0 in a transistor can be reduced by reducing:  (1) IB (2) VCC (3) IE (4) Temperature

Answer :

ICB0 in a transistor can be reduced by reducing: Temperature.

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What is meant by ‘Capital Gain’ ? (1) Part of profits added to the capital (2) Appreciation in the money value of assets (3) Additions to the capital invested in a business (4) None of these

Answer :

Appreciation in the money value of assets

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What is meant by the term “midnight sun” ? (1) Twilight (2) Rising Sun (3) Very bright moon (4) Sun shining in the polar circle for long time

Answer :

Sun shining in the polar circle for long time

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What is meant by pinch off voltage in MOSFET?

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What is meant by body effect in MOSFET?

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What is meant by feedback in electronics?

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What is meant by feeder in power system?

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A feeder line is a peripheral route or branch in a network which connects smaller or more remote nodes with a route or branch carrying heavier traffic. The term is applicable to any system based on a hierarchical network.

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The problem for the research related to metaphysics can be Options: A) What is meant by existence B) What are the qualities of the existence of the objects C) How knowledge of individuality of the objects can be realised D) All the above

Answer :

D) All the above 

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Description :

When a definition implies a proposal to use the definiendum to mean what is meant by the definiens it is called (A) Lexical definition (B) Stipulative definition (C) Precising definition (D) Persuasive definition

Answer :

(B) Stipulative definition

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What is meant by Isthmus? (1) Mouth of a river where it joins the sea (2) Narrow strip of water dividing two land masses (3) Narrow strip of land dividing two oceans (4) Narrow strip of land connecting two large areas of land

Answer :

Narrow strip of land dividing two oceans

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What do you meant by POST? Give solution for the following error indication i. No beep ii. Continuous beep

Answer :

The PC has built - in test programs which do their jobs as soon as the PC is powered on. This Power On Self Test (POST) firmware is stored in ROM on the motherboard. This ROM occupies the ... board, or disconnected speaker.  ii. Continuous beep: Checking of power supply system board, key board. 

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What is meant by nuclear Fission ? 

Answer :

Nuclear Fission:- The process in which heat energy is released without using oxygen for combustion in process is known as nuclear Fission.  

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What do you meant by sensitivity list and zero modeling?

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Sensitivity list: Every concurrent statement has a sensitivity list. Statements are executed only when there is an event or signal in the sensitivity list, otherwise they are suspended. Ex. F

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What is meant by energy meter constant?

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Energy Meter Constant  A fixed value which is used when converting meter readings to actual energy use, especially when potential transformers and similar types of equipment are used in metering. For example, K=--------rev/Kwh

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What is meant by Biot Savart law?

Answer :

Module 3 : MAGNETIC FIELD Lecture 15 : Biot- Savarts' Law Objectives In this lecture you will learn the following Study Biot-Savart's law Calculate magnetic field of induction due to some simple ... other circuit. NPTEL Distributed under Creative Commons Attribution-ShareAlike - CC BY-SA.

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What is meant by brand resonance?

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What is meant by resonance?

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What is meant by devoted computer ____.  a) Which uses only one kind of software b) Which is used by only one person c) Which is assigned with only one task d) No such type of computers are available

Answer :

What is meant by devoted computer ____.  a) Which uses only one kind of software b) Which is used by only one person c) Which is assigned with only one task d) No such type of computers are available

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What is meant by firing angle of thyristor?

Answer :

The point at which SCR is triggered is known as firings angle of thyristor.

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What is meant by resistance heating?

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What is meant by dielectric heating?

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What is meant by fuzzy system?

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