Electrical Engg. Materials EE-208 4th Sem Nov 2016 B.Tech PTU 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 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

Electrical Engg.Materials EE-208 4th Sem nov 2016 B.Tech EE Paper

Get Started

Section a Electrical Engg.Materials EE-208 4th Sem nov 2016 B.Tech EE Paper              

What are the applications of superconductors?

Applications of superconductors

   

Give examples of liquid dielectric.

Examples of liquid dielectric.

   

Define electric loss.

Electric loss.

   

What are hysteresis loss?

Hysteresis loss

   

What is meant by magnetic anisotropy?

Magnetic anisotropy

   

What is meant by diamagnetic?

Diamagnetic

   

 Material used for resistors for precision measurement

Material used for resistors for precision measurement.

   

Name the magnetic material used in electrical machines.

Name the magnetic material used in electrical machines.

     

What are anti ferromagnetic material?

Anti-Ferromagnetic material

 

What do you mean by relative permeability ?

Relative permeability 

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

Section B :Electrical Engg.Materials EE-208 4th Sem NOV 2016 B.Tech EE Paper              

What is meant by bipolar relaxation? Show that it leads to complex dielectric constant of the material and deduce the expression for same.

Bipolar relaxation

Show that it leads to complex dielectric constant of the material

 

Define mean free path of an electron and deduce expression for the same.

Mean free path of an electron  

 

What is Curie Weils law?

Curie Weils law

 

Write Short note on spontaneous magnetisation.

Short note on spontaneous magnetisation.

 

In which categories are magnetic material divided and on what basis?

which categories are magnetic material divided and on what basis

 

Explain the terms : magnetic reluctance, coercive force, magnetic susceptibility, magnetic retentivity of a substance.

Magnetic reluctance

Coercive force

Magnetic susceptibility,

Magnetic Retentivity of a substance.

Electrical Engg.Materials EE-208 4th Sem Nov 2016 B.Tech EE Paper 

Electrical Engg. Materials EE-208 4th Sem Nov 2016 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 nov 2016 B.Tech EE Paper              

Describe the various internal mechanism which contribute to dielectric constant of material.

Internal mechanism which contribute to dielectric constant of material.

 

Give the concept of dielectric loss in a dielectric.

Concept of dielectric loss in a dielectric.

 

Explain the effect of alloying and mechanical stressing on the value of resistivity of a material.

Effect of alloying and mechanical stressing on the value of resistivity of a material.

 

What is the effect of temperature on resistivity of conducting material and hence define temperature coefficient of resistance.

Effect of temperature on resistivity of conducting material

Define temperature coefficient of resistance.

 

Write short notes on : a) Paramagnetism

Paramagnetism

 

Short Note on b) Piezoelectricity

Piezoelectricity

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 Nov 2016 B.Tech EE Paper
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