I • I ufQ
I MECHANICAL ENGINEERING
PAPER I
SECTION A
1.Answer any four of the following (each answer should confirm to a limit of arow1d 150 words)
Explain how several eccentric masses rotating in different planes are balanced.(10)
What is meant by buckling of columns? Show how end fixation affects the buckling load

What is hardening? Why should hardening be followed by tempering?

(d)Discuss briefly a power pressing technique as applied 10 ceramic materials.

(e)Give one method for the heat treatment of high speed tool steel


<img src='./qimages/1507-2a.jpg'>

Determine the natural frequency of oscillation of spring mass system as shown above.

(b)Determine the addendum of two equal involutes spur gears in mesh with the following
specification.
Number of teeth=60
Pressure angle=20°
Module=6mm, and
Arc of contact=1.75xcircular pitch.

What is meant by friction circle Show that the radius of friction circle depends only on the
radius of the journal and coefficient of friction.

Give the field of application of chain drives State the advantages and disadvantages of chain
drives

3.(a)A steel bar of diameter 60 mm and length 300 mm is subjected to an axial compressive load
of 50 kN. To what diameter the middle one-third length of the bar be reduced in order to
increase the stored energy by


cantilever of length 1.2 m carries a udl of 4 kN/m run and a concentrated load of 10

kN at the free end. The cross-section of the cantilever rectangular and having a width of 40
mm and a depth of 100 mm.
Draw S.F and B.M. diagrams for the cantilever and obtain the value of S.F. and B.M
at a section lm from the free end.
(ii)Obtain normal stress and shear stress distribution on the section 1m from the free end,
and
(iii)Calculate the maximum deflection of the cantilever and indicate the location where it
occurs.

4.(a)The fluctuation of energy of a flywheel with mass 7500 kg and radius of gyration 2m is 60
kN-m. Mean speed is 120 rpm. determine the maximum and minimum speeds.

A crank and slotted lever quick return motion mechanism has the following specifications
Distance between fixed centers= 200 mm
Length of Ute driving crank 100mm
Sketch the mechanism Determine the inclination of the slotted bar with the vertical in the
extreme position and the ratio of cutting stroke to return stroke

rectangular plate of thickness 10 mm carries tensile normal stresses of sigma1 600 MPa and 2
sigma2= 200MPa on two perpendicular planes on which there are no shear stresses.Obtain the
change in thickness of the plate. take F.= 200x10pow9 Pa and G 80xl0power9 Pa.

SECTION B
5.1 t!WOt' any tour ofU1e following {tU!ch ttll!Wat' sltottldconform 10 a limit of tltound ISO

What is meant by Built-Up-Edge chip? Comment on its effect during metal cutting
action.
(b)with a block diagram, explain the electroforming process and its application.

(c)List out the steps required in "Morphology of Design" for product development and
manufacturing.

is meant by job design?
(ii)How will you prepare the job structures to meet the job requirements?
(iii)Summaries the decisions involved

(c)Write down the characteristics of c arrays for engineering application.

what is the purpose of parity check in NC program preparation?

What are the assumption made in u ultrasonic machining process and also write the process
parameters for the same?

deriving the equations, determine the power required to draw wire from 15.5 mm to 13.25
mm in diameter at 125m/min speed.Where mew 0.15, alpha=5 deg, S =2k=39 Kg/mm2
(10 10)
7.(a)An automobile instrument manufacturer has identified the following options for obtaining a
machined component They can our-source component at Rs.220/- per unit (including
materials) They can manufacture the component on a semiautomatic lathe at Rs.80/- per
component (including material),or they can manufacture the components on a CNC turning
centre at Rs. 181- per component including materra ls. There is negligible tftbe items are
outsourced, a semi-automatic lathe costs Rs 3.5 Lacs and CNC turning centre costs Rs.9.5
Lacs Suggest your optimal choices for minimizing cost and maximizing profit if the
component is sold at Rs.310/- each.

the past, an 'MNC industries' has used a fixed time period inventory system that involved
taking a complete inventory count of all items each month. However, increasing labour costs
are forcing the industry to examine alternative ways to reduce the amount of labour involved
in inventory stock- rooms, yet without increasing other costs, such as shortage costs. Here is a
random sample of 10 Items.

<img src='./qimages/1507-7b.jpg'>
(i)What is your recommendation to cut the costs by using analysis
(ii)If the item 7 is critical to continued operations. how will you recommend for items
classification?
(10
Discuss about frequent versus infrequent capacity expansion of a manufacturing system.

Describe a queuing model with KENDALL's notation incorporating the priority rules.(5)
company markets dry ground nuts (packeted) through a chain of food stores. it has been
experiencing over-and-underproduction because of forecasting errors. The following data are
in demand in packers for the past 5 weeks. Groundnut packers are made for the following day
for example, Sunday's production is for Monday's sales Monday's production is for
Tuesday sales. and so forth the company is closed on Saturday, so Friday's production
must satisfy demand for both Saturday and Sunday
<img src='./qimages/1507-8b.jpg'>
Make a forecast for this week on the following basis
(i)Daily using a sin1Ple five-week moving average.
(ii)daily using a weighted average of 0.3,0.25,0.2,0.15,0,10 for the past five Weeks.
The following table shows the data for a PERT Programme
<img src='./qimages/1507-8b.jpg'>

A and B are start activities A controls C. D and B controls F and G depends on C:H
depends on E and F control I and L:K depends on L is also controlled by and
L are tbe ending activities
(i)Construct the network.
(ii)Find the critical path
What is the probability of completing the project in 18days?