(Following Paper illand Roll No. to be filled in your Answer Book) •
I I'
Roll No.
B. Tech. (SEM, IV) THEORY EXAMINATION 2010-11 ELECTRICAL
AND ELECTRONICS MATERIALS
ENGINEERING
Time : 2 Hours P.
•.•.
Note': (1) (2) 1.
Attempt all the questions. All questions cany equal marks.
Attempt any four parts of the following: (a)
Define the atomic packing factor ~~.coordinat~on nu~ber.
(b)
The potential energy of two particles in the field of each other is given by: . A B V(r)=--+-.
l
ylO
Show that the potential energy in the stable configuration . is equal to
-4[A] -:-s y~
(c)
.
Explain the "Miller Indices". Also mention its significances in Material Sciences.
(e)
(i)
SIMPLE CUBIC CRYSTAL
(ii)
Boby centred Cubic Crystal (BCG)
(~)
Face"'centred Cubic Crystal (FCC).
Copper has an FCC crystal structure and an atomic radius of 1.278A. Calculate the density of copper. The atomic weight of copper is 63.54 gmlmol.
(f)
What is the difference
between
Schottky defect and
Frenkel defect in crystal lattices ? Also mention their significances.
...
I ~~ ne', I m
The sY,IIlbolshaving their usual meanings. A density of silver is 10.5
x
103 Kg/m3• The atomic wdght
of silveris 107.9. Assuming that each silver atom provides one conduction electron, calculate the density of electrons. The conductivity of silver at 20°C is 6.8
x
107 Q-I.m-l.
Calculate the mobility of electrons iri silver. (c) . Explain the "Meissner Effect". Also explain Type-I and II super conductors with their examples.
E~timate the London penetration depth from the following data:
(a) fJ1' •••.•
Explain the Hall Effect in semi conductor materials with related
diagram
and expressions.
Also mention
its
importances in semiconductor materials.- . An electric field of 100 V1m is applied to a sample of n-type sernicondutor whose Hall Coefficient is -0.0 125 rp3/c. Determine the current density in ..!be saIii}JlJ a;sur'ning ,.-
'-
\'
..•
Ile = 0.36 m2 V-I sec-I• (b)
Explain the
V-I Characteristics ofP-N Junction diode and
its temperature dependence. Find the increase in temperature DT necess.ary to increase 10 by a factor of 100. (c)
Write short notes on any two of the following: (i)
CONTINUITY
EQUATIONS
(ii)
SPACE CHARGE CAPACITANCE
(iii) MOBILITY OF SEMICONDUCTORS.
4.
(2xIO=20)
Attempt any two parts of the following: (a)
Write short notes on any two parts of the following: (i)
DIAMAGNETIC
(ii)
PARAMAGNETIC
MATERIALS
(iii) FERROMAGNETIC (b)
MATERIALS MATERIALS.
Define relative permeability.
Show that the relative
permeability :
I
~r
= 1 +X
I
where Xis the magnetic susceptibility .. (c)
Defme magnetostriction andmagnetostrictive energy. What is the cause of magneticstriction
f1' .'.
in ferromagnetic
~aterials ? A magnetic field strength in copper is 106 AIm. If the magnetic susceptibility 'of copper is 0.8
x
10-5,
calculate the flux density and magnetization in copper. .
(a)
,
~_O~10=20)
Attempt any two parts of the following :
What do you mean by "ANTIFERROMAGNETISM"
?
Which materials show this type of behaviour ? ,
.Calculate the average magnetic moment along the field direction per spin in Bohr Magneton when a paramagnetic spin system is subjected to a uniform field of 106 Aim at 27"C. (b)
Explain the temperature
dependency
on the magnetic
susceptibility of diamagnetic, paramagnetic, ferromagnetic, anti ferromagnetic and ferrimagnetic materials. (c)
Define ferrimagnetism. applications
What are ferrites ? Give some
where ferrimagnetic
materials
are used.
Explainwhat is magnetic anisotropy. How anisotropy can be induced by magnetic annealing?
frame and other is free to rotate, carrying with it the pointer shaft. Two irons lie in the magnetic field produced by the coil that consists of only few turns if the ...
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Page 1 of 23. EE 1354 MODERN CONTROL SYSTEMS. KINGS COLLEGE OF ENGINEERING, PUNALKULAM 1. KINGS. COLLEGE OF ENGINEERING. DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING. QUESTION BANK. NAME OF THE SUBJECT: EE 1354 MODERN CONTROL SYSTEMS.
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A thermal generating station has an installed capacity of 15 MW and supplies a daily load of 10 MW for 12 hours and 5. MW for remaining 12 hours. The plant capacity factor for this station is a. 1 b. 0.75 c. 0.67 d. 0.5. 2. Power output (in kW) of a
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