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Tuesday, September 6, 2016

Electrical Engineering Materials Question Paper of 3rd Semester Electrical(D) Download Previous Years Question Paper 1






S.B. Roll No.______

ELECTRICAL ENGINEERING MATERIALS
3rd Exam/Elect/5243/Dec’04

Duration: 3 hrs.
Note: Attempt any five questions.
1.       
a.     What is the role of free electrons in materials properties?
b.     Classify materials oased on their energy hands.
c.      What will be the effect of a high electric field across an insulator?
d.     How insulators do not allow to current pass through them.
2.       
a.     What are the properties of high resistivity materials?
b.     Give the materials for, rheostats, thermocouples, heater element, bulb filaments, choke.
c.      What are ACSR conductors, what are their advantages, where they are used?
3.       
a.     Explain the behavior of semiconductor at absolute zero and above absolute zero temperature.
b.     What are the materials used for PN junction and explain their differences also.
c.      What are negative temperature coefficients of resistance and where you have heard of it?
d.     Below  room temperature how silicon will behave.
4.       
a.     What factors play an important role in selection of an insulating material?
b.     What is dielectric strength and what factors affect dielectric strength?
c.      What material is used to insulate the armature and main field colls of motors?
d.     Why porcelain is used in line insulators?
e.      Why refractories are used as thermal insulators?  
5.       
a.     How magnetic materials are classified according to their magnetic behavior?
b.     Explain various soft magnetic materials.
c.      What are hysteresis and eddy current losses?
6.       
a.     List the various dielectrics used in fixed and variable capacitors.
b.     How carbon composition variable resistors differ form wire wound resistor?
c.      Why core of transformer is made of laminations?
7.       
a.     What is super conductivity? Give names of superconductors and their advantages.
b.     How insulating materials are classified according to temperature?
c.      How you will choose material for a fuse wire explains?

8.     Write short note on any three

a.     Materials for d.c  motors
b.     Thermocouples and their application
c.      Non electrical engg. Material
d.     Discuss the use of copper and aluminum in electrical engineering

e.      Physical properties of insulating materials  

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