Download AKTU B-Tech 4th Sem 2016-17 Electrical And Electronics Engineering Material 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) 2016-17 Electrical And Electronics Engineering Material Question Paper

Printed Pages : 1 Roll No.| l l l l I l l l l l EEE403
B.TECH.
THEORY EXAMINATION (SEM?IV) 2016-17
ELECTRICAL AND ELECTRONICS ENGINEERING MATERIAL
Time : 3 Hours Max. Marks : 100
Note : Be precise in your answer. In case Ofnumerical problem assume data wherever not provided.
SECTION ? A
1. Explain the following: 10 X 2 = 20
(a) What do you mean by co-ordination number ?
(b) Find the miller indices for a plane when the intercepts along the axes are 2a, 3b and 2c.
(c) What is the difference between crystalline and non?crystalline material?
((1) Explain seebeck effect.
(e) What is superconductivity? Name some super?conducting material.
(f) Differentiate between drift and diffusion current.
(g) What happen when a p-n junction is biased in forward direction?
(h) Why does a pure semiconductor behave like an insulator at absolute zero?
(1) Give relationship between relative permeability and magnetic susceptibility.
(j) Draw hysteresis curve for a ferromagnetic material.
SECTION ? B
2. Attempt any five of the following questions: 5 x 10 = 50
(3) Define the following: (i) Unit cell (ii) Space lattice (iii) Atomic packing factor
(b) Explain Bragg?s law. How Bragg?s equation can be used to determine the lattice
parameters. Determine the interplanar distance in a crystal in which a series of planes
produce a first order re?ection from a copper X?ray tube 0? = 1.539A) at an angle of
225?-
(c) Explain the ?Meissner Effect?. Also explain Type-I and II superconductors with
examples.
(d) Derive an expression for heat developed in a current carrying conductor. Also explain
the factors responsible for it.
(e) Explain in detail p?n junction diode and its VI characteristics.
(f) Distinguish between insulator, conductors and semiconductor 0n the basis of band
theory. Give the electrical characteristics of n?type and p?type semiconductors.
(g) How do you classify the material as dia, para or ferromagnetic? Explain
ferromagnetism in detail.
(h) What is magnetostriction? How many types are possible?
SECTION ? C
Attempt any two of the following questions: 2 x 15 = 30
3 Determine the atomic packing factor of the following:
(i) Simple cubic crystal
(ii) Body centered cubic crystal
(iii) Face centered cubic crystal.
4 What is Hall Effect in semiconductor? The resistivity of doped silicon crystal is 9.23 x
10'3 Q-m and hall coefficient is 3.84 X 10'4 m3C'1. Assuming that the conduction is by a
single type of a charge carrier calculate the density and mobility of carrier.
5 (i) Distinguish between soft and hard magnetic materials. Discuss and explain
typical B-H curve for soft magnetic material.
(ii) Determine the temperature coefficient of resistance of material used in a resistor
if the resistance at 25?C is 50 Q and at 70?C is 57.2 Q.