Mechanical Engineering

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USN 10ME63
Sixth Semester B.E. Degree Examination, June/July 2014
Heat and Mass Transfer
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, Time: 3 hrs. Max. Marks:,l$O,
',r.,*']t*, Note: l. Answer FIVEfull questions, selecting at least TWO questions
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I a. Whatfuihermal diffusivity? Explain its importance in heat conduction@blems. (04 Marks)
b. Describd ifferent types of boundary conditions applied to heat conduotion problems.
Marks)
c. Consider u o*"Am"nsional steady state heat conduction in a ptite with constant thermal.i'
conductivity in a,t@$ion 0 < x < L. A plate is exposed to urdfuim heat flux q Wm2 at x: 0
and dissipates heat
( x ( L. A plate is exposed to rldfuim heat flux q Wnt' at x: 0
vection at x: L with heat tra&sfir"'coefficient h in the surcounding
air at T*. Write the
dimensional steady state
ical formulation of thleproblem for the determination of one
:rature distribution wiffiih the wall. (04 Marks)
d. An industrial freezer is des to operate wfthatr internal air temperature of -20oC when
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are 12 Wm2oC uoa S Wm2oC, r"*p""iiu.ly. The wall of the freezer are composite
construction, comprising of an inner layer of plastic 3 mm thick with thermal conductivity of
1 Wm"C. An outer layer of stainXess- Steel of thickness 1 mm and thermal conductivity of
16Wm'C. Sandwiched betweenjh6se layers is a layer of insulation material with thermal
conductivity of 0.07 Wm}ff-'"Find the wi ls. the insulation required to reduce the
convective heat loss to 15 rffi2 (08 Marks)
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a. What is critical thickn&3 of insulation on a small dianiS#rwire or pipe? Explain its physical
significance and derite an expression for the same. fl; "
" . (10 Marks)
b. A set of alumin u fins (K: 180 WmK) that are to be fitted;" 4 small air compressor. The
device dissipatei 1 KW by convecting to the surrounding air #hichis at 20"C. Each fin is
100 mm$ng, 30 mm high and 5 mm thick. The tip of each fiN mpy be assumed to be
adiabatie hnd a heat transfer coefficient of 15 Wm2K acts over
'tfie,,,'i_emaining
surfaces.
$q@ the number of fins required to ensure the base temperature does'tiot.Sxceg{
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_ A.,,,'" What are Biot and Fourier numbers? Explain their physical significance. (061vlarks)
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1o b. What are Heisler charts? Explain their significance in solving transient convection
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c. The temperature of a gas stream is measured with a thermocouple. The junction mal b€
approximated as a sphere of diameter 1 mm, K : 25 WmoC, p : 8400 kg/m3 and
C : 0.4 kJ/kg'C. The heat transfer coefficient between the junction and the gas stream is
h: 560 Wm2oC. How long will it take for the thermocouple to record 99% ofthe applied
temperature difference ?
a. Establish a relation between Nusselt, Prandtl and Grashof
analysis.
b. Explain velocity and thermal boundary layers.
(08 Marks)
numbers using dimensional
(08 Marks)
(06 Marks)
L of2

2. 10ME63
c. A 30 cm long glass plate is hung vertically in the air at 27"C while its temperature is
maintained at 77"C. Calculate the boundary layer thickness at the trailing edge of the plate.
Take properties of air at mean temperature K: 28.15 x 10-3 WmK, y : 18.41 x 10-6 m2ls,
P. : 0.7, 9
:3.07 x 10-3 K-1. (06 Marks)
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PART _ B ,l-'::=,:,
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'.;;.$fl, a. Explain the significance ofl i) Reynolds number, ii) Prandtl number, iii) Nusselt.number,
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iv) Stanton number.
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l(QEMarks)
b*,. ftmospheric air at 275 K and free stream velocity 20 m/s flows over a flat plate of length
'-rts m lons maintained at325 K. Calculate:
over the region where the,&,9undary layer is
r.
ii)
iir)
Properties atffi temperature of 300 K.
K:0.026 WmoC,{"BL,- 0.708, y: 16.8 x 10-
and widffi m. assume transition occurs at a Reyno@'r
Properties"atffin temperature of 300 K. -: .*" nq,, r
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x 10-6 rrf/s, trr=.lff'x 1,l.ff " 10-s kg/m-s.
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Derive an expression foi{}r€-.,effectiveness of a parall8}"flow heat exchanger.
annulus at arate of 0.16 kg/s. The coefficient for the water side and oil side are
respectively 1000 Wm2"C and The fouling factors are 0.00018 m2oC/W and
length of 1.5 m
x 10s. Take air
(12 Marks)
(10 Marks)6a.
b. Engine oil is to be coold&i&om 80oC to."SbeC by using a single pass counter flow,
concentric-tuhe heat exchanser=#th cooline reater available at 20"C. Water flows inside aconcentric-tube heat exchanger=$tficooligg;ilater available at 20"C. Water flows inside a
tube with an internal dia of 2.5 cr*r'.#jth aT{ow rate of 0.08 kg/s and oil flows through the
7a.
b.
c.
8a.
b.
c.
Explain film wise and drOF Wise condensation. ' (04 Marks)
Draw the boiling cu;qq nd discuss the different regimtisOf boiling. (08 Marks)
Derive an expresgion"for the total mass of water vapour diffirsed from a water column to the
air passing oveffi'water container. h Is" (08 Marks)
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Explain hffiy the concept of a black body.
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(04 Marks)
State:.{.S$irchoff s law, ii) Plank's law, iii) Wien's displacememd}gv. (06 Marks)
Caftilbie the net radiant heat exchange per m2 area for two hrfie parallel plates at
ture of 427'C and 2l"C respectively e for hot plates is 0.9 and for cold plate it is
. i"',3.6. If polished aluminum shield is placed between them, find percentage reduction in the
l*;i".'neat transfer. Assume e for shield :0.4. (10 Marks)
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Firfrffi average heat transfer over the entire length 1.5 m of $w'@te.
Calcirl64,$,"he total heat transfer rate from the plate to thenp$aVer the
and wid&ds m. assume transition occurs at a RevnoHslrrkrmber 2
2 of2

3. USN
3 hrs.
4 au,,ffiproject has the following tasks. Its immediate predecessor and
{,1 betow. Using largest candidate rule balance the line and determine:
10ME61
Sixth Semester B.E. Degree Examination, June/July 2014
Gomputer lntegrated Manufacturing ,,,....;;_,.;.,.,,,,.,
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Note: Answer FIVEfult qaestions, selecting
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De@'gutomation. Explain different types of automation system with gqafrles. (10 Marks)
Explairyffie terms: i) Utilization; ii) Manufacturing lead time .-
&*.ir=o (04 Marks)
The averago=ipart produced in a certain batch manufacturing plarrt nrust be processed through
an average bfurnachines. There are 20 new batches parts laq{i-hid each week. Data for the
average problddr ar€.as follows:
Average op..ution ti-:: 6 min ,;lii,
'
Average setup time = 5 hours
Average non-operatieflfue: 10 hours
Average batch size:25ffEts d."1*,
There are 18 machines in the plant. The plant operates an average of 70 hours/week.
Determine: i) Manufacturing lead tjqre, ii) Plrnt capacity, iii) Plant utilization. (06 Marks)
What are the symbols used in an au^fo ated flow line? (05 Marks)
Sketch and explain the following work part transfer mechanism:
i) Linear walking beam
iii) Dial indexing machine " (15 Marks)
In a eleven (11) sta6roff'fransverse line the probability'of itation breakdowns will occur for a
given work parf q g4rul to 0.02. This probability is same;bi l the 11 stations. Determine
the frequenc{ lii.iCI stop/cycle on this flow line using upper bou+4 ppproach and lower bound
approach wqry,* average production time : 1.6 min. Determinegroduction rate. (10 Marks)
What is th€::purpose of buffer storage? State its effectiveness in auhffited flow line.,::' ,:::'
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Writ 'short note on partial automation (04 Marks)
.a:,: :
the task tim8S,,are given
i) Number of work stations ii) Balance delay of line iii) Line efficiency.
Take T.: 1 min.
Tasks I 2 J 4 5 6 7 8 9 t0 11 12''.
Preceded by I t.2 2 3 J 3,4 6,7,8 5,8 9, 10 11
T" (min) 0.2 0.4 0.7 0.1 0.3 0.1 1 0.32 0.6 0.27 0.38 0.5 0.1,2
(12 Marks)
Explain the following terms in line balancing;
i) Minimum rotational work element.
ii) Total work content time
iii) Cycle time
iv) Line efficiency.
I of2
(08 Marks)

4. 10M861
PART - B
5 a. Explain the design for automated assembly system. (07 Marks)
b. Explain with a neat sketch the elements of part feeding device. (08 Marks)
c. List the applications of AGVs. (05 Marks)
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"'. # a. With a neat sketch explain retrieval 'CAPP' system. (10 Ma *t'
;.l;,3{ .p What is a material requirement planning? Explain various inputs and output*.I.9_
_MRP
.ffi system. ,={to-Marks){
7 a.r"@pscribe the advantages, disadvantages and applications of CNC machine to&|s.:' (10 Marks)
b. Y#fmn the fundam.itul rt.pr involved in devilopment of part programn$fg-br milling and
**qm." *fu (loMarks)
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8 a. Explain r$i&qketches the common robot configuration. . dT,'-*
" (10 Marks)
b. Explain the-@wing: ;r
ii) Precision of m.oveXrent
iii) End effectors in topts r.*a r
iv) Repeatability wF I v
lr; (10 Marks)
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2 of2

5. USN 10ME62
Sixth Semester B.E. Degree Examination, June / July 2Ol4
Design of Machine Elements - II
Time: 3 hrs.
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2a.
b.
3a.
b.
Max. Marks:100.
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Note: 1. Answer FIVE faU questions, selecting
at least TWO questions from each parl
2. Design data handbook is permitted.
b.
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,*{"tig.Ql (a)
A cast iron cylinder-of internqpffi@etei 200^mm and thickness 50 mm is subjected to a
?ressure of 5 N/mm2. Calculatedt$ tangenridfhnd radial strOsses at the inneT, iniddle and
If=
outer surface. ;,,.,;' i (10 Marks)
A compressor is AIiXW'by a motor of 2.5 kW, runaing at 1200 rpm to a 400 rpm
compressor. Select,e'suitable V-belt. : :: (l0Marks)
Explain Hoistirry,fffile mechanism to raise and lowering naA for a rope. (10 Marks)
Derive an.di.bfession for the stres induced in a helical spring ittfut notations. (10 Marks)
Design..dle'af spring for the following specification for a tru6kffta} load : 120 KN,
nu bf springs :4, material for the spring is chrome-vanadium steeffueprnissible stress in
0.55,,"GPa. Span of spring : 1100 mm, width of central band : 100 mm. and allowable
'deflection
: 80 mm, number of fulI length leaves are 2 and graduated leaves 6. .,. (10 Marks)
Design apair of spur gear to transmit a power of 18 kW from a shaft running at 1000 rpm to
a parallel shaft to be run at 250 rpm maintaining a distance of 160 mm between tfuashaft
centres, Suggest suitable surface hardness for the gear pair. (20 M4di$) -
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PART _ B
A pair of bevel gear wheels with 20o pressure angle consists of 20 teeth pinion meshing with
30 teeth gear. The modulus is 4 mm while is 20 mm. The surface hardness of both pinion
and gear is 400 BHN. The pinion rotates at 500 rpm and receives power from an electric
motor. The starting torque of the motor is 150 percent of the rated torque. Determine the safe
power that can be transmitted considering the dynamic load wear strength and endurance
strength. The allowable bending stress may be taken as 240 MPa.
I of2
(20 Marks)

6. 10M862
6 a. A plate clutch with a maximum diameter of 600 mm has maximum lining pressure of
0.35 MPa. The power to be transmitted at 400 rpm is 135 kW and p: 0.3. Find inside
diameter and spring force required to engage the clutch, if the spring with spring index 6 and
material of spring the wire diameter if 6 springs are used. (10 Marks)
.,dl * b'
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The torque absorbed in the band break shown in Fig. Q6 (b) is 400x103Nmm. DesignThe torque absorbed in the band break shown in Fig. Q6 (b) is 400x10'Nmm. Design ffi
band and lever taking p: 0.27 and diameter of drum as 400 mm. The allowable st_reqHih-
band may be taken as 70 N/mm2. (t0lffarks)band may be taken as 70 N/mm2 (il1I
$:'40o
7a.
b.
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Derive Petroff s equation fo&bti:efficient of friciion in joumal bearings. (08 Marks)
Design the main bearin66$a steam turbine that rum at 1800 rpm and 70"C . The load on the
bearing is estimated to,bd2500 N. i;.,rri (12 Marks)
Design a cast Fdn piston for a single acting four stroke diesel gngine from the following
data: '- ' -',-}
Cylinder borp: 100 mm i*
!*elffifl.^"ke: 125 mm { ,
Sp.ffi 2000 rpm *fl
Bffimean effective pressure : 0.5 MPa, ".
,..:{lkiximum gas pressure:S MPa, :
,* :'"Fuel consumption:0.25 kg/ Brake Power in kWhour " ,,,,"'',. "'
Assume any further data required for the design. (!ffirr<g
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2 of2

7. USN 10M864
E9 '{r
3E 2 a. A cantilever bear{ffipan'L' is subjected to a point load*:*,6e end. Derive an equation for
E d the deflection at tee"eed by using RR method. Assumffilynomial displacement function.
=
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E f b. Write the properties of sfi&ess matrix and derive ttid element stiffiress matrix (ESM) for a
.= qr
E a.*. lD bar element. *,#a t ,*q .. (10 Marks)
H OO J h "* _-.
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E.E 3 a. A modal co-ordinate of the triang{f'k*1e.nieflt is shown in Fig.Q.3(a). At the interior point
o B 'D' the co-ordinate is 3.3 and Nr 'StDetermine 'N2' and 'N3' and the y co-ordinate at
E q vv vreruslv ro
: !
E .E point P. o ,"
*.-. * (05 Marks)
! f I ^'J*'')Bi FigQ3(a) ?e*,D I lF >,cs,e
EE "* | ,6,gE .-, ,; +-
6 U. IlxPratrslryttll a sl(gtulr Pr4u9 srrt,ss 4uu PrauE urraml. tu" ; ' uu rvr4rAD,
E c. Derive ttre equilibrium equation in elasticity subjected to body fo-f.ffi'"aiid traction force.
cl
U 1;1"r r,n .f .*- (10 Marks)
EO I ,
E : b. What is convergence requirement? Discuss the 3 conditions%feoqvergence requirement.
E E -'-" ' ""' (05 Marks)
E q c. Derive tlrqsMpe function of a 4 noded quadrilateral element. f (10 Marks)
o j ' I
a.Q,
Sixth Semester B.E. Degree Examination, June/July 2014
Finite Element Methods
,r.':/Time: 3 hrs. Max. Marks:*lQ0-::..::: .::. ';
';''! Note: Answer any FIWfull questions, selecting ",0;i """' ::::::';::*'_:::!:": 2.:'-:"::y :'_'.:''
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g 1 a. '{&mt*is FEM? Sketch the different types of elements used based onge6hretry in finite
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E eletf@pnalysis. (1D, 2D and 3D). is,, (04 Marks)
K b. Expldifuith a sketch plane stress and plane strain. ..1,.. (06 Marks)
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fl,E 4 a. Cpffii the bar shown in Fig.Q.4(a). Usrng elimination method otrganAfrrg boundary
F E goqrditions. Determine the following:H 0.) P'- '
iE *-F Nodal displacements. ' *fu-*
H $ " ;-
- ii) Stress in each element. r'l' .
E E %.* iii) Reaction forces. - , "
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'" Take E: 200GPa. (lo Marks)
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1 of2

8. 10ME64
Consider the bar shown in Fig.Q.4(b). An axial load P:60 x 103N is applied at its midpoint.
Using penalty method of handling boundary condition. Determine: i) Nodal displacements;
ii) Stress in each element; iii) Reaction at supports. Take A:250mnf; E :200GPa.
(10 Marks)
r;.+
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(04 Marks)
Fie.Q.6(b)
Fig.Q.a@)
la.
b.
(16 Marks)
(08 Marks)
(12 Marks)
i) Slopes at2 al$',*.' ii) Vertical defliction at the midpoiim.oFsre load.
Take E:20qdP6; I:4 x 106mma. ";:t
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Fig.Q.7(b)
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8.. b,; Bnng out the differences between continuum methods and FEM.
ffiU. Solve the temperature distribution in the composite wall using lD heat elements,t"lano"; ;: -' -* - --"* ,- -----
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- approach of handling boundary conditions. (Fig.Q.8(b)).
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-, rrr : 20WmoC; Kz : 30WmoC; Kl : 50 WmoC; h: 25 Wm2oC; T- : 800oC
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9. 10ME65USN
Sixth Semester B.E. Degree Examination, June / July 2014
. .r Mechatronics & Microprocessor
ing
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H I a. ;-biscuss a measurement system and its constifuent elements. "J'*"'"'=:'(08
Marks)
, E b.
='Elplain
'programmable logic controller'. (04 Marks)
E c. Illffi the basic elements of a microprocessor based engine managen;ent system.
;, i (08 Marks)6"'
E 2 lllustrate the following proximity sensors:
E a. Capacitive type. = ',' il*' (10 Marks)
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E ; . 3 a. Discuss the constructiOa and operation ofpermanent-1na$bi DC motor. (08 Marks)
to
I b. Illustrate any two typea sfpc motor configurations{{'? (08 Marks)
:E i c. Illustrate the construction'&&d working of an eleqtrichi ielay. (04 Marks)
EY
b90
i ; 4 a. Discuss the inverting and non itte{itg co ions of OPAMPS. (08 Marks)
; E b. Illustrate how OPAMPS can be rffz".pi{,fqr-m adding operation. (05 Marks)
A Z c. Illustrate a DAQ system. p;#= (07 Marks)
;E::::
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Z"1 ', PART-B
-
; ; 5 a. Present the Boolean expresgignS;'symbols Sw$..'futtr tables for 3 input NAND gate and
A1 PARr-B
-
; i 5 a. Present the Boolean expresgignS;'symbols Sw$.-.'futtr tables for 3 input NAND gate and
ei 3 input NOR gate. (lo Marks)
€ i b. Write the Boolean algebra expressions for the following:
E E i) Commutative law. ii) Associative law. iii) Distributive law. (06 Marks)
BT c. For the circuit shown i" nig. Q5 (c), obtain the expression for Y in terms of X6, Xr, A and B
E ; inDuts. (04 Marks)
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5 L 6 Discuss the following with respect to internal architecture of a microprocessor: ",.
A a , a. A typical memory device. (10 Mark$*ri*
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, j b. lnstruction register. (10 Marksf .:,,, ..'
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2 7 a. Discuss the term 'BUS' with reference to the architecture of a microprocessor. (10 Marks)
E b. Discuss the different addressing modes used in microprocessors with an example for each.
ts (10 Marks)
g 8 'u. Explain fetch, execute and instruction cycles with a diagram. (06 Marks)
b. Illustrate the data flow from memory to the data register. (08 Marks)
c. the terms machine cycle and state, associated with microprocessors.
(06 Marks)
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10. USN
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Soo? 3 z. Exnlain the variahles in A-IM nrocess- "u;1''
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EB'
10ME665
(06 Marks)
(06 Marks)
Sixth Semester B.E. Degree Examination, June / July 2014
:I::,
,,,,:- Non Traditional Machining
, ,
,,,T,itrne: 3 hrs. Max. Marks;*'100
. , .,,,, Note: Answer FIVE fuA questions, selecting i.- "
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E I a. Explain
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'rlb
2 a. Explain thb@peters that effect on metal removal in USMpr6wiS. (08 Marks)
h F.rrnlcin the triid;feed rnechanisrn in I ISM 1$.. ;r1::, (06 Mnrks'l
$I b. Explain the toolefeqd mechanism in USM. , (06 Marks)
gE c. Explain clearly tt*affpplications, advantages and disadvaatged ofUSM process. (06 Marks)
.,,, .,: lof,e: Answer rlv.Dlult lluesuons, sstecrtnt i. "
.. ,,,s"' .. st least TWO questions from each parl ....()-o
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E '""i""'',, PART - AO "..":::::'
E I a. Eipl"aiqlhe need of NTM and give the complete classification ofNTM. (10 Marks)
H b. With @p,rnatic diagram, explain USM. ,a,
= (10 Marks)
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E E 4 a. Explain the chemistry in ECM pro@Sail- ' (08 Marks)
p A b. With sketch explain the following:
; E i) Electrochemical grinding.9?(g Q
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Explain the variables iir.AJM process. ;-'"" (08 Marks)
With simple sketches explan'Fnozzle geometry id%JM process. (06 Marks)With simple sketches expl@pozzle geometry id:tUM process.
Write the applications, advan{$es and limitafiffinfwaterjet n
; E t) .trlectr:Ochemlcalgnndmg. ,.,,'.,,'-,,,r;'
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t + ii) Electro chemical Honing.
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! i 5 a. What is chemical mac{ffiing? Explain the fundamenful principles.! i 5 a. What is chemical mac{ffiing? Explain the fundamenful principles. (06 Marks)
E E b. Explain the followiggymith sketches : i) Chemical milling ii) Chemical Blanking (08 Marks)
; ;; c. Explain the different tlp.r of Maskants used in chemical'inacHning. (06 Marks)
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E: "i -1
E [ 6 a. What are
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requirements of a good dielechic fluid used in EDN4 process? Explain the
E i methods-bt$lectric flushing in EDM process. .ql"ry3 (10 Marks)
E E b. with $fejeh explain Rotary pulse generator type power supply circuitintrDM. (06 Marks)
e E c. Explain the following with respect to EDM: d
E E i) fPu tool (Electrodes) -:
a E ii) Heat affected zone. (04 Marks)
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Ef .1 ,u. Explain with sketch the principle of plasma generation and mechanism of metal fbqilovpl in
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' plasma arc machining. (10 Ma*{
! a - b. Explain the safety precautions in PAM. (0a Maffigia
: I c. Mention any two advantages, applications and limitation in PAM. (06 Marks)
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2 8 With a sketch explain the following process and also mention their merits and demerits :
E a. Laserbeam machining.
E b. Electron beam machining. (20 Marks)
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