Lovely Professional University 2011 B.Tech Civil Engineering : mec104::manufacturing science - Question Paper

COURSE : MEC104::MANUFACTURING SCIENCE
Time allowed:1.5hr
1.This paper contain five ques. divided in 3 parts
2.Part A and B are compulsory
3.In part C(question four to 5),attempt any one ques. out of 2 .attempt all part of the ques. chosen.
4.The markes assigned to every ques. are shown at the end of every ques..
5.Answer all ques. in serial order.
PART A.
ques. NO 1.
a)What is difference ranging from roughing and finishing operations in machining?(2)
b)Identify the 3 sources of contraction in a metal casting after pouting
c)Define manufacturing capability.?(2)
d)Name the 3 modes of tool failure in machining?(2)
ques. no 2.
a)A Heat source can transfer 3500 W to a metal part suface .The heat impinges the surface in a circular areas,with intensities verying inside the circle.The distribution is as follows;60% of power transferred with in a circle of diameter=3mm,and 80% is transferred with in a concentric circle of diameter=9mm,What are the power densities in (a)the 3mm diameter inner circle and (b)the 9mm diameter ring that lies around the inner circle.
b)What are the machinihng operations related to drilling(any 5)?explain with the help of diagram.?
PART B
ques. no 3.Write a notes on:
1.Shrinkage
2.Directional Solidification
3.Differentiate ranging from expendable mold and premanent mold.(15)
PART C
ques. no 4.
With the help of neat sketches,explain briefly the tool elements and tool angles in case of a single point tool.(15)
ques. no 5.
The total solidification times of 3 casting shapes are to be compared(1)a sphere,(2)a cylinder, in which the length to diameter ratio=1.0 and (3) a cube.For all 3 geometries,the quantity =1000 cube.The identical casting alloy is used in 3 cases.(a)Determine the relative solidification times for every geometry.(b)Based on the outcomes of part(a),which geometries element would make the best riser?(c)If the mold constant=3.5min/cm2 in chvrinov's rule,compute the total solidification time for every casing

Earning:   Approval pending.