PH8252 important questions Physics for Information Science

PH8252 important questions Physics for Information Science important questions for regulation 2017 in Anna University.

The PH8252 important questions is available in this page for download.

Subject Name	PHYSICS FOR INFORMATION SCIENCE
Subject Code	PH8252
Regulation	2017
File	PDF

Sample PH8252 important questions PHYSICS FOR INFORMATION SCIENCE:

Define mean free path.

The average distance traveled by a free electron between any two
successive collisions in the presence of an applied field is known as mean free
path. It is the product of drift velocity of the electron (vd) and collision time (τ)
λ= vd ×τc

Electrical Conductivity
1. The co-efficient of electrical conductivity is defined as the quantity of
electricity flowing per unit area per unit time maintained at unit potential
gradient.
2. Electrical conductivity is purely due to number of free electrons.
3. Conduction of electricity takes place from higher potential end to the lower
potential end.

What is Fermi level in a semiconductor?
Fermi level in a semiconductor is the energy level situated in the band gap
of the semiconductor. It is exactly located at the middle of the band gap in the
case of intrinsic semiconductor.

What is an intrinsic semiconductor?
Semiconductor in an extremely pure form (without impurities) is known as
intrinsic semiconductor.

What are paramagnetic materials?
The magnetic materials which exhibit paramagnetism are called
paramagnetic material.

What is non-linear optics?
The field of optics dealing with the non-linear behavior of optical materials.

What are the applications of metallic glasses?

Metallic glasses possess high tensile strength. They are superior than
common steels. This makes them useful as reinforcing elements in concrete,
plastic or rubber.
Due to their high strength, high ductility, rollability and good corrosion
resistance, they are used to make razor blades. This fact is also utilized to
make different kinds of springs.

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EC8251 important questions Circuit Analysis

EC8251 important questions Circuit Analysis for regulation 2017 anna university.

The important questions for Circuit Analysis is provided in this page for download in pdf formate.

Subject Name	CIRCUIT ANALYSIS
Subject Code	EC8251
Regulation	2017
File	PDF

Sample EC8251 important questions:

What is electric circuit or electric network?

The combination of various electrical elements such as resistors, capacitors and inductors along with various energy sources such as voltage and current sources is called electric circuit or electric network.

Define branch and node.

Branch: It is a portion of a circuit with two terminal connected to it. A branch may contain one or more elements.

Node: It is a junction of two or more branches.

Define bilateral and unilateral network.

Bilateral network: The voltage-currant relationship is same for current flowing in either direction is called bilateral network.

Ex. R, L and C

Unilateral network: The network has different relationships between voltage and current for the two possible directions of current.

Ex: Diodes, vaccum tubes

Define static characteristics.
Static characteristics are the set of rules or criteria that is defined for those instruments that varies very slowly with time or remains a constant.

What is the property of additivity and homogeneity?

The principle of super position is a combination of additivity and homogeneity.

The property of addivity says that the response in a circuit due to number of sources is given by sum of response due to individual sources acting alone.

The property of homogeneity says that if al the sources are multiplied by a constant, then the response is also multiplied by the same constant.

What is meant by short and open circuits?

A short is conductor with zero resistance and an open is an infinitely large resistance. When we short circuit the resistance we replace the resistance by a conductor with zero resistance and when we open the circuit a resistance we remove the resistance.

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BE8254 important questions Basic Electrical and Instrumentation Engineering

BE8254 important questions Basic Electrical and Instrumentation Engineering Regulation 2017 Anna University free download.

BEIE Basic Electrical and Instrumentation Engineering important questions is provided to download for free in pdf.

Subject Name	BASIC ELECTRICAL AND INSTRUMENTATION ENGINEERING
Subject Code	BE8254
Regulation	2017
File	PDF

Sample BE8254 important questions Basic Electrical and Instrumentation Engineering:

Define magnetic reluctance
The opposition offered by the magnetic circuit for the magnetic flux path is known as magnetic reluctance. It is analogous to electric resistance.

Mention some magnetic materials
Alnicos, chromium steels, copper–nickel alloy, nickel, cobalt, tungsten and aluminium. (BE8254 important questions Basic Electrical and Instrumentation Engineering)

Define statically induced emf.
The coil remains stationary with respect to flux, but the flux through it changes with time. The emf induced is known as statically induced emf.

What do you mean by step down transformer?
If the secondary voltage is greater than primary value, the transformer is called step down transformer. (BE8254 important questions Basic Electrical and Instrumentation Engineering)

What are the functions of no-load current in a transformer?
No-load current produces flux and supplies iron loss and copper loss on no-load.

What is the significance of back emf?
In motoring mode, armature induced emf is known as the back emf to stress the fact that it opposes armature emf. It plays the rule of a regulator.

Write the principle of operation of 3 phase induction motor.
Induction motor works on the principle of faraday’s laws of electromagnetic induction. It consists of stator and rotor windings. As these rotor windings or bars rotate within the magnetic field created by the stator magnetizing currents, voltages are induced in them. If the rotor were to stand still, then the induced voltages would be very similar to those induced in the stator windings. (BE8254 important questions Basic Electrical and Instrumentation Engineering)

What is synchronous speed?
The speed at which the stator field rotates is called synchronous speed and it depends upon the frequency of supply and number of poles for which the stator is wound.

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BE8254 important 16 Mark questions Basic Electrical and Instrumentation Engineering

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BE8253 important questions Basic Electrical Electronics and Instrumentation Engineering

BE8253 important questions Basic Electrical Electronics and Instrumentation Engineering for Regulation 2017 Anna University.

The important questions for Basic Electrical Electronics and Instrumentation Engineering.

Subject Name	BASIC ELECTRICAL, ELECTRONICS AND INSTRUMENTATION ENGINEERING
Subject Code	BE8253
Regulation	2017
File	PDF

Sample BE8253 important questions with answers are provided below:

Distinguish between a Branch and a node of a circuit.
A pair of network which connects the various points of the network is
called branch A point at which two or more elements are joined together is called node.

Define line currents and phase currents?
The currents flowing in the lines are called as line currents The currents flowing through phase are called phase currents.

Define line voltage and phase voltage?
The voltage across one phase and neutral is called line voltage & the
voltage between two lines is called phase voltage.

Define open loop control system.
The control system in which the output quantity has no effect upon the input quantity are called open loop control system. This means that the output is not feedback to the input for correction.

Define line voltage and phase voltage?
The voltage across one phase and neutral is called line voltage & the
voltage between two lines is called phase voltage

What is meant by apparent power?
Apparent power is the product of voltage and current and it is not true power. Unit is VA

Define closed loop control system.
The control system in which the output has an effect upon the input
quantity so as to maintain the desired output value are called closed loop control system.

What GSM and CDMA stands for?
Ans. GSM stands for Global system for mobile communication.
CDMA stands for Code division multiple access.

What short notes on DVM?
DVM are measuring instrumen ts that convert analog voltage to signals in to digital or numeric readout.

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PH8251 important questions Materials Science

PH8251 important questions Materials Science for Regulation 2017 Anna University. The important questions for PH8251 Materials Science is provided in this page to download.

Sample for PH8251 important questions MATERIALS SCIENCE:

What are Nanomaterials?

Nanomaterials are the materials with atoms arranged in nano sized clusters which become the building block of the material. Any material with a size between and 100 nm[ 10^–9 m to 10^–7m] is called nanomaterials.

Give the principle of Shape memory Alloys

The shape memory effect occurs between two temperatures states, ie., Martensite and Austenite. The SMA in the Marteniste is attained the temporary deformed shape when cooling. But when heating the martensite state is changed into Austenite state. During deformation the resistivity, thermal conductivity, Young modulus and yield strength are decreased by more than 40%.

Define Hysteresis of a SMA?

Hysteresis of a SMA is defined as the difference between the temperatures at which the material is 50% transformed to austenite when heating and 50% transformed to martensite when cooling.

Define Cooper pair.

The electron pairs called cooper pairs are formed at low temperature by overcoming the repulsive forces. The cooper pairs moves without scattering (without any resistance) in the lattice structure. Now the material becomes super conductor. This is also called as electron-phonon- electron interaction these two electrons have equal and opposite momentum and spins.

What are the characteristics of high temperature [high T_C] superconductors?

High Superconductors have high temperatures.

They have a modified perovskite crystal structure.

Superconducting state is direction dependent.

These are oxides of copper with other elements.

These are reactive, brittle, and cannot be easily modified or joined.

For high superconductors, liquid Nitrogen is used instead of liquid helium.

Subject Name	MATERIALS SCIENCE
Subject Code	PH8251
Regulation	2017
File	important questions PDF

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GE8291 important questions Environmental Science and Engineering

GE8291 important questions Environmental Science and Engineering important questions for regulation 2017 Anna University.

The Environmental Science and Engineering important questions are provided in PDF format in this page.

Sample for GE8291 important questions with answers:

What are the threats to the Indian biodiversity?
Threats to Indian biodiversity- deforestation, destruction of wetlands, habitat
fragmentation, raw material, production of drugs, illegal trade and developmental
activities.

India as Mega diversity nation – Account.
India is one among the 12mega-diversity countries in the world. It has
89,450 animal species accounting for 7.31% of the global faunal species and
47,000 plant species which accounts for 10.8% of the world floral species. The
loss of biodiversity is about 33%.

Mention the abiotic components.
The non-living components of an ecosystem called abiotic components.
Examples: climate, soil, water, air, energy, nutrients, etc.

Mention the effects of solid waste.
Spreading of fungal diseases; Bad odours; Burning of waste produce
chemicals which are harmful to human life; Contaminates water & Affects the
characteristics of soil .

What are the harmful effects of land degradation?
Harmful effects of land degradation. – Soil structure and texture are deteriorated,
loss of soil fertility due to loss of valuable nutrients, increase in water logging,
salinity, alkalinity, acidity problems.

What is desertification? Give any two reasons for it?
Desertification is a progressive destruction or degradation of arid or
semiarid lands to desert. Desertification is characterized by DE vegetation,
depletion of ground water, salination and soil erosion.

Define sustainable development.
Sustainable development is defined as, “meeting the needs of the present without
compromising the ability of future generation to meet to meet their own needs”.

What are objectives of family welfare programme?
Slowing down the population explosion by reducing the fertility.
Due to pressure, over exploitation of natural resources reduced.

Subject name	Environmental Science Engineering
Subject Code	GE8291
Regulation	2017 Regulation
File details	Important questions in PDF format

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PH8253 important questions Physics for Electronics Engineering

PH8253 important questions Physics for Electronics Engineering for Anna University Regulation 2017.

Download the PH8253 Physics for Electronics Engineering important question with Answer in this page for second semester EEE department.

Subject Name	PHYSICS FOR ELECTRONICS ENGINEERING
Subject Code	PH8253
Regulation	2017
File	PDF

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1st unit ELECTRICAL PROPERTIES OF MATERIALS important question click here to download

2nd unit SEMICONDUCTOR PHYSICS important questions click here to download

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PH8201 Important Question Physics For Civil Engineering Regulation 2017 Anna University

The PH8201 Important Question Physics For Civil Engineering Regulation 2017 Anna University

PH8201 Important Question with answer:

The important question with answer are provided

What are metallic glasses?

Metallic glasses are amorphous metals (Glass metals). It is a non-crystalline alloy with molten liquid state it has the short range of atomic order. Metallic glasses share the properties of both glasses and metals, these are strong, ductile, malleable, opaque and brittle.

Define Glass transition temperature

 It is the temperature at which liquid like structure is frozen into the solid. The glass transition temperature for metallic alloys in about 20^OC to 30^OC

How the metallic glasses are prepared? Mention the different methods.

 Metallic glasses are usually prepared by rapid quenching, ie., cooling a metallic liquid so rapidly such that there is no enough time for ordered crystalline structure to develop. By this way we retained the liquid like structure into the solid. The cooling rate is in the order of 2 x 10 Kelvin per second

 Methods of preparation

          Twin roller system

         Melt spinning system

         The Melt Extraction system

Melt spinning system is the most commonly used method.

What are the types of metallic glasses?

Metallic glasses are classified into two types

         Metal – Metal metallic glasses

 These are combination of metals and metals Example: Ni-Nb, Mg-Zn, Cu-Zr, and Hf-V

         Metal – Metalloid metallic glasses

 These are combinations of metals and metalloids Example: Fe, Co, Ni and B, Si, C, P

PH8201 Important Question

What are the advantages of the metallic glasses used as core material?

         Transformer core is used to get maximum magnetic flux (energy). Transformer core should have low hysteresis loss and low eddy current loss.

         Metallic glasses are available in thin sheets therefore the size and weight of the transformer is reduced.

         Hysteresis loss is directly proportional to the area of the hysteresis loop. The loop area of the metallic glasses is very small and also has high initial permeability. So the hysteresis loss is almost zero.

         The eddy current in the core inversely proportional to the resistivity of the core material and directly proportional to the thickness of the lamination of the core. Since the resistivity of the metallic glasses is high and the thickness of the core laminated core is less. Therefore the eddy current loss is very less.

         Thus metallic glasses used as core material due to small thickness, smaller area, less weight high resistivity soft magnetic with low hysteresis and eddy current losses.

 What are the applications of metallic glasses?

Metallic glasses are used in

         Reinforcing elements in concrete, plastic, rubber

         Reinforcing filament in pressure vessels

         Construction of flywheels for energy storage

         Razor blades and different kinds of springs

         Tape recorder heads, etc,

The PH8201 Important Question Physics For Civil Engineering Regulation 2017 Anna University

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