C14 ee-105-electrical engineering materials

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C14–EE–105
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BOARD DIPLOMA EXAMINATION, (C–14)
OCT/NOV—2016
DEEE—FIRST YEAR EXAMINATION
ELECTRICAL ENGINEERING MATERIALS
Time : 3 hours ] [ Total Marks : 80
PART—A 4×10=40
Instructions : (1) Answer all questions.
(2) Each question contains two bits, (a) and (b) with two
marks for each bit.
(3) Answers should be brief and straight to the point.
1. (a) State any two properties of conducting materials.
(b) List any two applications of ACSR conductors.
2. (a) List any two properties of tungsten.
(b) List any two properties of mercury.
3. (a) Define semiconducting materials. Give examples.
(b) Classify semiconducting materials.
4. (a) List the factors affecting insulation resistance.
(b) List any two applications of PVC.
5. (a) Define polarization in dielectrics.
(b) Define relative permittivity and mention its value for air.
6. (a) Define Curie point.
(b) Define magnetostriction.
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7. (a) List the commonly used soldering materials.
(b) Define fuse.
8. (a) Define impregnation.
(b) State the uses of enamel-coated copper wires.
9. (a) Define primary and secondary cells.
(b) State any two applications of lead-acid cell.
10. (a) State any two applications of nickel-iron cell.
(b) Define trickle charging.
PART—B 10×4=40
Instructions : (1) Answer any four questions.
(2) Each question contains two bits, (a) and (b) with five
marks for each.
(3) Answers should be comprehensive and the criterion
for valuation is the content but not the length of
the answer.
11. (a) Explain hardening and annealing.
(b) Write any five properties each of aluminium and copper.
12. (a) Write the properties and applications of Eureka.
(b) List the colour codes of resistor as per BIS.
13. (a) Explain intrinsic semiconductor with a neat figure.
(b) Distinguish between P-type and N-type semiconductor in at
least five aspects.
14. (a) Distinguish among conductors, semiconductors and
insulators.
(b) State the properties and applications of SF6 gas.
15. (a) Explain dielectric loss and derive its equation.
(b) Classify magnetic materials according to relative permeability
and give examples for each type.
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16. (a) Explain soft magnetic materials and hard magnetic materials.
(b) Explain bimetals with examples.
17. (a) Explain the parts of lead-acid battery.
(b) State ampere-hour efficiency and watt-hour efficiency of a
battery.
18. (a) Explain charging of batteries by constant voltage method.
(b) State the precautions to be taken during charging and
discharging of batteries.
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/4045 3 AA6(T)—PDF