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Previous Year Exam Questions of Electrical Engineering Materials of bput - EEM by Verified Writer

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Type: PYQInstitute: Biju Patnaik University of Technology BPUT Course: B.Tech Specialization: Electrical EngineeringOffline Downloads: 40Views: 947Uploaded: 10 months ago

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Registration No: Total Number of Pages: 02 B.Tech. PEE3D001 3rd Semester Regular/Back Examination 2017-18 ELECTRICAL ENGINEERING MATERIALS BRANCH: ELECTRICAL Time: 3 Hours Max Marks: 100 Q.CODE: B1223 Answer Question No. 1 and 2 which are compulsory and any four from rest. The figures in the right hand margin indicate marks. Q1 a) b) c) d) e) f) g) h) i) j) Q2 a) b) c) d) e) f) g) h) i) j) Answer the following questions: multiple type or dash fill up type A crystal is said to have a simple form if its all faces are (i) Similar (ii) Dissimilar (iii) Partly similar (iv) Partly dissimilar The converse of hardness is known as (i) malleability (ii) toughness (iii) softness (iv) None of the above A perfect conductor has (i) Zero conductivity (ii) Unity conductivity (iii) Infinite conductivity (iv) None of the above Which of the following materials is preferred for transmitting electrical energy over long distance (i) Copper (ii) aluminum (iii) steel rein forced copper (iv) steel rein forced aluminum The super conductivity is observed (i) infrared frequency (ii) dc and low frequency (iii) ac and high frequency (iv) Frequencies having no effect (v) None of the above Thermionic emission occurs in (i) vacuum tubes (ii) copper conductors (iii) ferrite cores (iv) transistors Which of the following materials is not a semi conductor (i) Silica (ii) Germanium (iii) Selenium (iv) Gallium-arsenide The permeability of iron is around (i) 500 (ii) 800 (iii) 1200 (iv) 2000 The materials having permanent electric moment are called (i) anti- ferroelectric materials (ii) dielectrics (iii) electrets (iv) semi conductor materials. When the temperature exceeds to a certain value called the Curie point, the substance (i) Loses its ferro electric properties (ii) gains ferroelectric properties (iii) either of the above (iv) none of the above. (2 x 10) Answer the following questions: Short answer type What do you mean by mixed bonding? What is the difference between crystalline and non crystalline material? Derive an expression for heat development a current currying conductor. State the application of super conductors. What do you understand by the term loss angle of dielectric? What do you understand by paramagnetism and dimagnetism ? What do you mean by magnetic anisotropy? What do you mean by doping in semiconductors? What is hall effect? What is skin effect? (2 x 10)
Q3 a) (10) b) Name the four types of atomic bonding observed in materials. Describe any two of them giving examples. Write a short note on the origin of X-rays. Q4 a) b) Describe the thermoelectric effect of the materials. Explain super conductivity and its practical applications. (10) (5) Q5 a) Explain what is meant by polarization in dielectric. Discuss in brief electronic, ionic and molecular polarization in dielectrics. What do you mean by spontaneous polarization? (10) Explain the magnetic classification of the material. Explain the term magnetostriction as applied to ferromagnetic materials. Make a list of materials suitable for making permanent magnets and give the properties of these materials? (10) What is the semi conductor? Name the various semiconductor materials what is the difference between N-type and P- type semiconductor and how they are produced? What is hall effect? Describe the relation between hall coefficient and carrier density. Assume the presence of only one type of charge carrier? (10) b) Q6 a) b) Q7 a) b) (5) (5) (5) (5) Q8 a) b) Explain briefly feebly magnetic materials. Explain the various types of ageing of a permanent magnet. (10) (5) Q9 a) Distinguish clearly between soft and hard magnetic materials. Discuss their applications. Discuss the effect of alloying with nickel on the properties of magnetic materials? (10) b) (5)

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