Download AKTU B-Tech 4th Sem 2014-15 Electrical and Electronics Engineering Materials Question Paper

Download AKTU (Dr. A.P.J. Abdul Kalam Technical University (AKTU), formerly Uttar Pradesh Technical University (UPTU) B-Tech 4th Semester (Fourth Semester) 2014-15 Electrical and Electronics Engineering Materials Question Paper

Printed Pages : ?3
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(F allowing Paper ID and Roll No. to be ?lled in your Answer Book)
PAPER ID : 121407
; Roll No.
B. Tech. '
(SEM. IV) THEORY EXAIVIINATION, 2014-15
ELECTRICAL & ELECTRONICS ENGINEERING
MATERIALS
Time : 2 Hours] [Total Marks 2?50
1 Attempt any three parts of the followings : 5X3=15
(a) What is Atomic Packing factor ? Calculate its
value for simple cube and body centered cube.
(b) Show in diagram the (III) planes of a cubic lattice.
Calculate their interplanar distance. And also
calculate the Bragg angle if (111) planes of a cubic
(a = 3-5714) ) crystal are exposed to X-range
(wavelength is 1.571%J ).
(c) Explain with simple sketches the following :
(i) Edge dislocation
(ii) Screw dislocation
(d) What is Forbidden energy gap ?? Classify insulators,
semiconductors and conductors on the basis of
energy band diagram.
121407] 1 [ antd...

Attempt any three parts of the followings : 5X3=15
(a)
(b)
(9)
(d)
Explain super conductivity.
Determine the temperature ooe?icient of resistance
of material used in resistor if the resistance at
25?C is 50 ohms and atl70?C is 57.2 ohms.
Explain thermal conductivity and obtain an
expression for coe?icient of thermal conductivity.
Explain in brief the zone theory of solids.
State the following themlo-electric effects
(i) Seeback effect
(it) Peltier effect
(iii) Conduction effect
Attempt any?two parts of the followings : 5X2=10
(a)
1214M]
What is Hall eifect ?
The resistivity of semiconductor material was
known to be 0.0082 Om at room temperature.
The ?ux density in the Hall model was
0.48 wb/mz.
Explain the working principle of a MOSFET.
Discuss also the types of MOSFET and their
working
Discuss the volt-ampere characteristics and the
application of the following semiconductors.
(i) Zener diode
(ii) Tunnel diode.
2 [ Contd...
Attempt any two parts of the followings : 5X2=10
(a)
(b)
(0)
12.1400]
Explain brie?y any three of the following magnetic
hard materials :
(i) Tungsten steel
(ii) Cobalt steel
(iii) Chromium steel
(iv) Alnico.
Explain the phenomenon ofmagnetostriction with
particular reference to iron and nickel. Mention
major application of magnetostrictive materials.
Explain the Ferromagnetism.
The hysteresis loop of a specimen of iron weighing
10 kg is equivalent in area of' 255 joules/m3
of iron. Find the loss of energy per hour at the
rate of 50 c/s. Assume the density of iron as
7500 k.g/m3.
3 [975]