Deemed University 2009 A.M.I.E.T.E Electronics & Communication Engineering MATERIALS AND PROCESSES – ET (OLD SCHEME) in ELECTRONICS & COMM ENGG - Question Paper

AMIETE – ET (OLD SCHEME)

Code: AE04 Subject: MATERIALS AND PROCESSES
Time: three Hours Max. Marks: 100

NOTE: There are nine ques. in all.
· ques. one is compulsory and carries 20 marks. ans to Q. 1. must be written in the space given for it in the ans book supplied and nowhere else.
· Out of the remaining 8 ques. ans any 5 ques.. every ques. carries 16 marks.
· Any needed data not explicitly given, may be suitably presumed and said.


Q.1 select the accurate or the best option in the following: (210)

a. Ionic bonding in solids depend primarily on

(A) Van der waals forces. (B) electrical dipoles.
(C) sharing of electrons. (D) transfer of electrons.

b. Schottky effect defines

(A) effect of intensive electric field on the rate of electron emission from a cathode.
(B) current in temperature limited region.
(C) current in space charge region.
(D) Both (B) and (C).

c. Braggs formula for X-ray diffraction from crystal planes is provided by

(A) . (B) .
(C) . (D) .

d. d100:d110:d111 for simple cubic lattice stand in the ratio

(A) . (B) .
(C) . (D) .

e. For germanium the forbidden energy gap is

(A) 0.7 ev. (B) 0.15 ev.
(C) 0.3 ev. (D) 0.5 ev.

f. Which of the subsequent materials are piezoelectric?

1. Barium titanate 2. Alumina
3. Silica 4. Cadmium sulphide

(A) 1, two and four (B) 1, three and 4
(C) 1, two and three (D) 2, three and 4


g. The subsequent can be grown epitaxially on Si without creating significant distortion or imperfections

(A) SiO2 (B) GaAs

Earning:   Approval pending.