Electrical Engg. Materials EE-208 4th Sem Nov 2016 B.Tech PTU EE Paper
Download Previous Year Diploma Paper of Electrical Engg.Materials EE-208 4th Sem Nov 2016 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 Nov 2016 B.Tech EE Paper
SECTION-A
1. Write briefly :
a) What are the applications of superconductors?
b) Give examples of liquid dielectric.
c) Define electric loss.
d) What are hysteresis loss?
e) What is meant by magnetic anisotropy?
f) What is meant by diamagnetic?
g) Material used for resistors for precision measurement.
h) Name the magnetic material used in electrical machines.
i) What are anti ferromagnetic material?
j) What do you mean by relative permeability ?
SECTION-B
Q2. Attempt any five questions. 5×6=30
2. What is meant by bipolar relaxation? Show that it leads to complex dielectric constant of the material and deduce the expression for same.
3. Define mean free path of an electron and deduce expression for the same.
4. a) What is Curie Weils law?
b) Short note on spontaneous magnetisation.
5. In which categories are magnetic material divided and on what basis?
6. Explain the terms : magnetic reluctance, coercive force, magnetic susceptibility, magnetic retentivity of a substance.
SECTION-C
Q3. Attempt any three questions. 3×10=30
7. a) Describe the various internal mechanism which contribute to dielectric constant of material.
b) Give the concept of dielectric loss in a dielectric.
8. a) Explain the effect of alloying and mechanical stressing on the value of resistivity of a material.
b) What is the effect of temperature on resistivity of conducting material and hence define temperature coefficient of resistance.
9. Write short notes on :
a) Paramagnetism
b) Piezoelectricity
Applications of superconductors
Examples of liquid dielectric.
Electric loss.
Hysteresis loss
Magnetic anisotropy
Diamagnetic
Material used for resistors for precision measurement.
Name the magnetic material used in electrical machines.
Anti-Ferromagnetic material
Relative permeability
Electrical Engg.Materials EE-208 4th Sem April 2013 B.Tech EE Paper
Bipolar relaxation
Show that it leads to complex dielectric constant of the material
Mean free path of an electron
Curie Weils law
Short note on spontaneous magnetisation.
which categories are magnetic material divided and on what basis
Magnetic reluctance
Coercive force
Magnetic susceptibility,
Magnetic Retentivity of a substance.
Electrical Engg.Materials EE-208 4th Sem Nov 2016 B.Tech EE Paper
Internal mechanism which contribute to dielectric constant of material.
Concept of dielectric loss in a dielectric.
Effect of alloying and mechanical stressing on the value of resistivity of a material.
Effect of temperature on resistivity of conducting material
Define temperature coefficient of resistance.
Paramagnetism
Piezoelectricity
Ferromagnetic domains.
Explain B-H curves for power transformer and induction motor design.
Electrical Engg.Materials EE-208 4th Sem Nov 2016 B.Tech EE Paper
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