Download PTU B.Tech 2021 Jan EE 5th Sem 78703 Electrical Engineering Materials Question Paper

Download PTU (Punjab Technical University) B.Tech (Bachelor of Technology) / BE (Bachelor of Engineering) 2021 January EE 5th Sem 78703 Electrical Engineering Materials Previous Question Paper

Roll No.
Total No. of Pages :02
Total No. of Questions :18
B.T ech. (Electrical & Electronics)/(Electr ical Engineering)/
(Electronics & Electrical) (Sem.?5)
ELECTRICAL ENGINEERING MATERIALS
Subject Code :BTEE-504A-18
M.Code :78703
Time : 3 Hrs. Max. Marks : 60
INST RUCT ION TO CANDIDAT ES :
1 .
SECT ION-A is COMPULSORY cons is ting of TEN questions carrying TWO marks
each.
2 .
SECT ION-B c ontains F IVE questions c arrying FIVE marks eac h and s tud ents
have to atte mpt any FOUR q ues tions.
3 .
SECT ION-C contains THREE questions carrying T EN marks e ach and s tudents
have to atte mpt any T WO questio ns.
SECTION-A
Answer briefly :
1)
What do you understand by permeability?
2)
What is meant by hysteresis loss?
3)
What are N-type semiconductors? Give examples.
4)
What are bimetals? Give examples.
5)
What are paramagnetic materials? Also give examples of paramagnetic materials.
6)
Mention the characteristics of a good insulating material.
7)
Explain the Seeback effect.
8)
What do you mean by Ferroelectricity?
9)
What is Resistance? On what factors does it depend?
10) Explain Hall effect.
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SECTION-B
11) What do you mean by a thermo-couple? Explain the construction and working of a
thermo-couple.
12) State and explain main factors which decide selection of an insulating material for a
particular purpose.
13) How can the materials be classified on the basis of energy bands? Discuss.
14) Explain the term electrical conductivity. Also discuss effect of temperature on electrical
conductivity of metals.
15) Explain Curie point and Retentivity of magnetic materials.
SECTION-C
16) Write a note on following:
a. Photo electric emission
b. Polarization
17) What do you mean by Dielectrics? Discuss the effect of a dielectric on the behavior of a
capacitor. Explain the term dielectric constant and also discuss about the dielectric
constant of monatomic gases. Name any two dielectric materials used in electrical
machines.
18) Write a note on following:
a) Classical theory of electrical and thermal conduction in solids.
b) Electrical conductivity of doped materials.
NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any
page of Answer Sheet will lead to UMC against the Student.
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