Electrical Engg Materials EE-208 4th Sem April 2013 B.Tech EE Paper

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                     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.

Electrical Engg.Materials EE-208 4th Sem April 2013 B.Tech EE Paper

Get Started

Section a Electrical Engg.Materials EE-208 4th Sem April 2013 B.Tech EE Paper              

Justify the presence of in the equation,

Justify the presence of in the equation,
    

Define the quantity expressed by

Quantity expressed by
    

Write the relationship for combined polarization as function of r and                   atomic constant e, i , o.

Relationship for combined polarization as function of r and                   atomic constant e, i , o.
    

Write an expression for the current through the capacitor considering complex dielectric.

Expression for the current through the capacitor considering complex dielectric.
     

Explain the term “Debye Temperature”.

“Debye Temperature”.
     

Give the expression for Curie-Weiss rule, explain.

Expression for Curie-Weiss rule
    

Give the material composition of soft solder rods.

Material composition of soft solder rods.
     

Draw arrangement of dipole moments in different magnetic materials.

Arrangement of dipole moments in different magnetic materials.
      

Draw B-H curves for transformer core and resistance filament materials.

B-H curves for transformer core and resistance filament materials.
      

Derive Electric flux density ‘D’ from Coulomb’s law.

Electric flux density ‘D’ from Coulomb’s law.

Electrical Engg.Materials EE-208 4th Sem April 2013 B.Tech EE Paper 

Section B :Electrical Engg.Materials EE-208 4th Sem April 2013 B.Tech EE Paper              

What do you mean by polarization of dielectric materials when subjected to static fields?

Polarization of dielectric materials when subjected to static fields

Explain electrical conductivity of metal. Explain the necessity of alloy materials.

Electrical conductivity of metal. Explain the necessity of alloy materials.

Explain the term superconductivity. Explain the effect of temperature of magnetic flux.

Superconductivity. Explain the effect of temperature of magnetic flux.

Explain the characteristics of magnetic materials used for electrical apparatus.

Characteristics of magnetic materials used for electrical apparatus.

Explain why, Curie Law was modified to Curie-Weiss Law?

Why, Curie Law was modified to Curie-Weiss Law

Electrical Engg.Materials EE-208 4th Sem April 2013 B.Tech EE Paper 

Electrical Engg. Materials EE-208 4th Sem April 2013 B.Tech EE Paper

Get Started https://www.youtube.com/watch?v=UHX6f8TIvX8https://www.youtube.com/watch?v=M_RR6LVICp0https://www.youtube.com/watch?v=mV41CMWonN4https://www.youtube.com/watch?v=s0LVPE0Q3LE&list=PLA9Q9SDZ781WXNAWit379A4CRLMvjGiUw&index=14&t=0s

Section c :-Electrical Engg.Materials EE-208 4th Sem April 2013 B.Tech EE Paper              

Derive the Clausius-Mosotti relation for dielectric materials and hence deduce Lorentz-Lorenz equation.

Clausius-Mosotti relation for dielectric material

Deduce Lorentz-Lorenz equation.

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.

(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.

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.

(iii) velocity of an electron with the Fermi energy.

(iv) the mean free path of the electrons.

(iv) the mean free path of the electrons.

Explain ferromagnetic domains. Explain B-H curves for power transformer and induction motor design.

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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