SAPLE PAPER FOR GBTU/MMTU/UPTU

Electrical & Electronics Engg. Materials (EEE 403)

B.TECH – EN (IV SEM)

Q.1: Attempt any five questions (3*5)

(a): Explain the terms

(i) Thomson effect (ii) Seebeck effect (iii) Peltier effect.

(b): Determine the temperature coefficient of resistance of material used in resistor if the

resistance at 250C is 50 ohms and at 700C is 57.2 ohms.

(c): Enumerate the characteristics of good conductor.

(d): Distinguish between extrinsic and intrinsic semiconductors. Give their energy diagrams.

(e): Explain the factors affecting the electrical resistivity of the materials.

(f): Explain thermal conductivity and obtain an expression for coefficient of thermal

conductivity.

(g): Explain zone theory of metals. Define mobility.

Q. 2: Attempt any three (5*3)

(a) Derive an expression for heat developed in a current carrying conductor.

(b) What is semiconductor? Deffentiate between N-type and P- type semiconductor with current

conduction mechanism.

(c) Explain superconductivity? Enlist the properties of superconductors and mention its

application.

(d) Derive an expression for current density, conductivity and mobility based on electron theory

of gases.