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

Code: DE04 Subject: ENGINEERING MATERIALS
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 best option in the following: (2x10)

a. The dielectric constant of air is practically taken as

(A) Unity (B) More than unity
(C) Zero (D) Less than unity

b. The covers of electrical machines are made of

(A) Soft magnetic materials
(B) Hard magnetic materials
(C) Superconductors
(D) Semiconductors

c. The material with least resistivity is

(A) Constantan. (B) Silver.
(C) Manganin. (D) Nichrome.

d. Hysteresis loss lowest depends on

(A) Frequency.
(B) Magnetic field intensity.
(C) quantity of the material.
(D) Grain orientation of material.

e. Ceramics are good

(A) Insulators (B) Conductors
(C) Superconductors (D) Semiconductors

f. Manganin is an alloy of

(A) Copper, manganese and nickel
(B) Copper & manganese
(C) Nickel & manganese
(D) Aluminium, manganese & nickel

g. The dielectric strength of transformer oil should be

(A) 100 V (B) six KV
(C) 30 KV (D) 132KV

h. Resistivity of conductors is most affected by

Earning:   Approval pending.