ifs mechanical engineering 2007

8/11/2019 IFS Mechanical Engineering 2007

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UIS-l l ttr1

MECHANICAL I NGINI I RING

PAPER I

SECTION A

Jj

1. ,

th

eir cbJrnc

lorl.s ti

cs.

( 5)

( ii) r.J.:

r lain

in

brie

fthes

lrin hardening.

(5)

'2. (o)

~ w e c

a sulid ma

ss

of 10 kg and

th

e Door

nr

c "'-1>t lwo slobs of isolnto,.. -

MLural

rubber

slah ond i\:i ll In series . The rubber s i

nh

hn

s

ti

ffness of

300()

Nf

m

and equivalent vi


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1

of

I

1.2 mm.

[md

the

radial

pressure del'eloped at the

.iunction. Find

also the minimum

temperature ro 1\illch tl1c

cy

linder is to be heated to slip It omo the inner cylinder. Take

E; 2 ,.

HY

Nl

1

and a 1

2.5

" 10

.

"C

2


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7.

(d)

)

( aj

(5)

N

(n)

Namo

the

four method; of taper turning.

(5)

(i)

\ V l ~ : l l is onkc angle

nd

what i i

iL

' impor1ancc in mctl cutting?

(5)

(ii)

1

11\\\ mu ch is the

tonl-wetor

with respet.'l

m the

1\nrk mnteria l

(Die

t e e l l in vi'

ECM

nnd

E

DJv

.?

(i)

S)

Write

th

e t1ow

c

hoot and for finding the mnximlnn of set of three

numbers.

(51

(u)

Ditinguih hetwcen gencrnl puopose pr

It ..

0.05

e r ~

and

cement cosl5 Rs.

0.08

per kg.

'

11e block to be strong must not contain more

than 4

kg

of

sand and mnst

no

t conta

n

less thnn 2 kg

of

cement.

\\ '

hal

is

the minimam cot

of

the block:

(b) Whnt nrc tlrc dilfoJ"enl codes used tn

NC

progmmming lor NC m ~ ~ h i n tools'/

Write lite NC ~ . : . u d c for the fo llowing op

c"rnt

ions

(i)

interpnbti

n11

(ii)

Cin.:

ular ' 'TJIOiatirln cnunler-clockwosc l a h o r ~

(i i

i) DweU

(iv)

nold Delay

(101

10)

(20)


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v) TI1read-cutting

vi) E

nd of

programme

vii) Spindle on, clockwise rotation

viii) Toolchnngc

.x Coo lant supply No. I on

:-;}

Coolant

SUil

l

>ly

ofl:

of9


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ll/S-

lltll

'l

MECHANICAL I NGINI I RING

PAPER

II

SECTION A

Jj

I,

A n s w ~ r nny four parts:

2.

(n) The o

nl

y way in w hich hOllt can

be

tronsJCrrcd form a

Cll

m ot engine in ouhrr space is by

radiation. The rate

at

which heat,. radiated is

pr

oportional to

th

e t

i>

urth power

of th

e bolute

tempeJ'II

Lur

e 1'

1

and to tbe area

of

(he radioling surface. Show that for a given power output

and a giwn

T

1

' tlte area of he rad.iatorwill be minimum when

= ~

z;

10

(lJ) Two reversible heal engines A and B arranged in series, A rejecting lJcaJ' directly to B.

Engine A receives heal 200 kJ at a

t.cmpera Ure

of

42J"C from n heat source, w

h:il

e engine B

" in communic"tion

wi

th a cold $mk at a temperature of 4.4C'. If the 1\ork output of A ls

twice that if B.

Hnd

(i) the i n t e r m e d i ~ l c tempcrnlllrc bcl\>ccn A nmliJ. (ii) the cllicicncy of

each eugine and (iii) the heal

reje-c

ted to the cold sink.

(10)

(c) Prove

the

Mayer

re13t.ion

r _ ~ C = v

P

I

;

\\'here a

is o

tl1erma.l

p r ~ s i b

and P oe ffi

cien

t

of

vo lume

ex

p3.0Sion,

I ))

(d ) l'ernpernture profile

fo

r heat conduction through a wall of con$

tantlh

ermal condnc1ivity is a

SttaJghl line, J l r O W 3 t is

IJeGomes

pambolic iuthe pr


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4.

,

ur

a.

17 c. Dctc

m1

ine ti) the initiA:lnd

11M

I

v a i l ~ b i l i l )

of l

nr

ond (iii the

max

i

mum

u

sef

ul

k ossucbtcd witl1the VtMc:s.

()

12

A 1\)ur-cylincler.

s l N ) k e q

engine running

1

40

n:v

/sec ~ w i t h a carhurettor which

is

rtqulred to p i y 5

1\g

of>il'

Jnd 0.5

kg

of fucii'Cf min u

LC-

Tlu; f11cl specific Sfl'Vity is

n.

75.

Tite uir i< inl tioily ut I bar and 300 K Co leuloto tho throat diameter of Ut o c.hoko lor flow

velocity of 100 mlsec. V e l o c i t ~ coeftkient is If

th

e pressure drop across tho fuel

metering 11rilillc

is

OHO ilf

h

AI uf choke. c:tlculatc

th

e ori1ice diomelcr ossuming ( V= 0.60

a n d y ~ 1.4. If lh" C.'llb uc- 1 3 clll ' O u ~ '


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(c)

(I)

7

ur)

Diflereutinto among

i n c m ~

viscosity, thermal

d l f f u . ~ v l t y

and diffu ion coef'tici

cn

t.

:-ihow tnat

th

ey have a m un it.

(5)

(ii) Estiuwtc tbc ' ' of

Or &ti

ou

of tolul o

pt.in

r c f r i g ~ r h o

~ y s t c m

hu8"

"" J

>a


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7.

8.

( )

R

n f refrigerontle.wing

the generntc

>r

:

( i)

n,e

heat

uppli

d in the generJtnr

perx

oe;

(i

ii)

TI>

c hct

rt:jooli

on rate io Ute

ab

ifs mechanical engineering 2007

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