The Institution of Engineers,India 2008 A.M.I.E Section A DPIETE : DE04: ENGINEERING MATERIALS ( 08) - Question Paper

(A) Composition. (B) Temperature.
(C) Pressure. (D) Current.

i. In silicon the forbidden gap is

(A) 1.1eV. (B) 0.25 eV.
(C) 0.5 eV. (D) 0.7eV.

j. In order to find P-type germanium, it should be doped with a

(A) Tetravalent impurity.
(B) Pentavalent impurity.
(C) Trivalent impurity.
(D) Any of the above will do.



ans any 5 ques. out of 8 ques..
every ques. carries 16 marks.


Q.2 a. Classify the conducting materials and provide their properties. (8)

b. discuss the properties and applications of
(i) Asbestos
(ii) PVC (8)

Q.3 a. discuss the magnetisation- curves of magnetic materials. (8)

b. discuss the significance of the loss tangent of a dielectric material. (8)

Q.4 a. Write a note on superconductors. (8)

b. provide the 4 alloys & their composition, which are used for making heater and thermocouples elements. (4)

c. Write a note on thermocouples. (4)

Q.5 a. discuss the P-N junction with a suitable diagram. (8)

b. discuss the effect of temperature on the conductivity of a semiconductor. (8)

Q.6 a. discuss the effect of temperature on electrical conductivity of metals. (8)

b. provide the properties & applications of carbon & steel. (8)

Q.7 a. discuss ferroelectricity and piezoelectricity& also provide their applications. (8)

b. Write the properties & applications of silicon & nickel iron alloy. (8)



Q.8 a. discuss the terms Valence Electrons, Conduction Band, Valence Band & Energy Gap with suitable diagrams. (8)

b. discuss ferrites and provide their applications. (8)

Q.9 a. discuss Hysteresis loop of magnetic materials. (8)

b. With examples discuss diamagnetic, paramagnetic & ferromagnetic materials. (8)

Earning:   Approval pending.