BOARD OF TECHNICAL EDUCATION
Programme: Electrical Engineering
Subject: Electrical Engineering Materials(4101)
Time Duration: 3 Hrs. Max. Marks: 75
Instructions: 1) All Questions are compulsory.
2) Figures to the right indicate full marks.
3) Assume suitable additional data if required.
Q.No.1. Answer any five of the following Questions: (5 x 3 = 15)
a) Discuss the various conductor materials used in overhead
b) Define the terms resistivity and conductivity as applied to
c) State the merits of semiconductor devices used in electrical
d) Define Dielectric loss and explain the term breakdown voltage of
e) State the difference between an insulator and a dielectric.
f) What are soft and hard magnetic materials?
g) Discuss the applications of Radioactive materials.
Q.No.2. Answer any two of the following Questions: (2 x 6 = 12)
a) What are the main alloys of copper? List out the properties and
uses of any two such alloys.
b) State the advantages and disadvantages of Aluminium as
compared to copper.
c) Discuss the conducting materials used for transformers and
rotating electric machines along with their properties.
Q.No.3. Answer any Three of the following Questions: (3 x 4 = 12)
a) Compare Germanium and silicon as semi-conducting materials.
b) Discuss the Hall effect phenomenon and give the area of
application where this effect is made use of.
c) Define the term ‘Thermistor’. Discuss in detail properties of
Thermistor and possible application.
d) Write a short note on LDR and LCD.
Q.No.4. Answer any two of the following Questions: (2 x 6 = 12)
a) Discuss in detail polar and nonpolar materials.
b) Explain the charging and discharging of a dielectric material.
Also explain the term ‘permittivity’ of a dielectric material.
c) Explain in detail the conduction through liquid dielectrics.
Q.No.5. Answer any two of the following Questions: (2 x 6 = 12)
a) Give the general classification of insulating materials giving
b) Give the types of applications of insulating varnishes, paints and
c) Discuss the properties and applications of PVC and ceramic as
insulating materials used in electrical engineering.
Q.No.6. Answer any two of the following Questions: (2 x 6 = 12)
a) i) Give the classification of magnetic materials according to their (03)
relative permeability and give examples of each.
ii) State the properties required of a magnetic material used for (03)
1) Making transformer core and 2) making permanent magnets.
b) i) Draw typical hysteresis loop for wrought iron and hard steel. (03)
ii) List out the properties of Tungsten and give its area of (03)
c) Explain the properties and uses of materials for i) Fuses (06)