Lovely Professional University 2011 B.Tech Mechanical Engineering Material science - Question Paper

Course:MEC 208;:MATERIAL SCIENCE
Time allowed 1.5hr
Total marks;50
1.This paper contains five ques. divided in 3 parts
2.Part A and B are compulsory
3.In part C(question four to 5) attampt any one ques. out of 2.Attempts all parts of the ques. chosen.
4.The marks assigned to esch ques. are shown at the end of every ques.
5.Answers all ques. in serial order.


PART A
ques. 1
a)What is interstitial impurities?(2)
b)Explain difference in movement of edges dislocation and screw dislocation with force applied?(2)
c)Define slip and slip plane?(2)
d)What is the effect of diffusion species on diffusion mechanism?(2)
e)What do you understand by primitive unit cell?(2)\
ques. no 2
a)Calculate the density of copper which has an atomic radius of 0.128nm,an FCC crystal structure and atomic weight of 63.5g/mol(5)
b)What do you understand by case hardening of steel.How diffusion play important role in this?(5)


PART B

ques. no 3
define the 5 various properties of a metal.(15)

PART C
ques. no 4
discuss the subsequent term
a)Recovery
b)Recrystallization
C)Grain growth(15)

ques. no 5
a)Vacancy
b)Frankel's defect
c)Schottky's defect
d)Edge dislocation
e)Screw dislocation(15)

Earning:   Approval pending.