Download Previous Year Diploma Paper of Electrical Engg.Materials EE-208 4th Sem April 2013 B.Tech EE Paper
B.Tech. (EE/EEE) (Sem.–4)
ELECTRICAL ENGINEERING MATERIALS
Subject Code : EE-208 Paper ID : [ A0410]
Time : 3 Hrs. Max. Marks : 60
INSTRUCTIONS TO CANDIDATES :
1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks each.
2. SECTION-B contains FIVE questions carrying FIVE marks each and students have to attempt any FOUR questions.
3. SECTION-C contains THREE questions carrying TEN marks each and students have to attempt any TWO questions.
Electrical Engg.Materials EE-208 4th Sem April 2013 B.Tech EE Paper
SECTION-A
Q1. Do as directed. 15×1=15
a. Justify the presence of in the equation,
b. Define the quantity expressed by
c. Write the relationship for combined polarization as function of r and atomic constant e, i , o.
d. Write an expression for the current through the capacitor considering complex dielectric.
e. Explain the term “Debye Temperature”.
f. Give the expression for Curie-Weiss rule, explain.
g. Give the material composition of soft solder rods.
h. Draw arrangement of dipole moments in different magnetic materials.
i. Draw B-H curves for transformer core and resistance filament materials.
j. Derive Electric flux density ‘D’ from Coulomb’s law.
SECTION-B
Q2. Attempt any five questions. 5×6=30
2. What do you mean by polarization of dielectric materials when subjected to static fields?
3. Explain electrical conductivity of metal. Explain the necessity of alloy materials.
4. Explain the term superconductivity. Explain the effect of temperature of magnetic flux.
5. Explain the characteristics of magnetic materials used for electrical apparatus.
6. Explain why, Curie Law was modified to Curie-Weiss Law?
SECTION-C
Q3. Attempt any three questions. 3×10=30
7. Derive the Clausius-Mosotti relation for dielectric materials and hence deduce Lorentz-Lorenz equation.
8. A conduction wire has a resistivity of 2.04 × 10–8 ohm-m at room temperature. The Fermi energy for such a conductor is 5.8ev. There are
5.8 × 1028 conduction electrons per m3. Calculate :
(i) the mobility and relaxation time of the electrons.
(ii) the average drift velocity of the electrons when the electric field applied to the conductor is 1.1 V per m.
(iii) velocity of an electron with the Fermi energy.
(iv) the mean free path of the electrons.
9. Explain ferromagnetic domains. Explain B-H curves for power transformer and induction motor design.
Justify the presence of in the equation,
Quantity expressed by
Relationship for combined polarization as function of r and atomic constant e, i , o.
Expression for the current through the capacitor considering complex dielectric.
“Debye Temperature”.
Expression for Curie-Weiss rule
Material composition of soft solder rods.
Arrangement of dipole moments in different magnetic materials.
B-H curves for transformer core and resistance filament materials.
Electric flux density ‘D’ from Coulomb’s law.
Electrical Engg.Materials EE-208 4th Sem April 2013 B.Tech EE Paper
Polarization of dielectric materials when subjected to static fields
Electrical conductivity of metal. Explain the necessity of alloy materials.
Superconductivity. Explain the effect of temperature of magnetic flux.
Characteristics of magnetic materials used for electrical apparatus.
Why, Curie Law was modified to Curie-Weiss Law
Electrical Engg.Materials EE-208 4th Sem April 2013 B.Tech EE Paper
Clausius-Mosotti relation for dielectric material
Deduce Lorentz-Lorenz equation.
(i) the mobility and relaxation time of the electrons.
The average drift velocity of the electrons when the electric field applied to the conductor is 1.1 V per m.
(iii) velocity of an electron with the Fermi energy.
(iv) the mean free path of the electrons.
Ferromagnetic domains.
Explain B-H curves for power transformer and induction motor design.
Electrical Engg.Materials EE-208 4th Sem April 2013 B.Tech EE Paper
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