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T2225 iTO513 I,C. ENGINEERING

wtrcxf xr* I crctr f lru2q I sltY

Q. P. Code: 600701

(3 Hours) 1\{ax. Marks: 80

Note:

1, QuestionNo.l is ccmpulsory.2. Soive anlr 3 frorn remaining 5 questions.3. Total No. of questions to be attempted are Four4. Assume suitable data. if necessary.

Qia) What is octans number and cetane number?b) Explain CRDI and MPFI in brief.c) State True or False and Justifu, that, "The SI Engine is quality governed and cI

Engine is quantity governed.,,d) Willan's line method of caicuiation of F.P. is best suitable for Si or CI Engine and

why?

55

5

Q2a)

c)

Write the requirements ofa) Fuel iqiection systems of cI Engines b) Ignition systerns in sI Engines.An 8-cylinder, four-stroke engine of 9 cm bore and li cm stroke with-a compressionratio of 7 is tested at 4500 rpm on a dynamometer which has 54 cm arm. nur;ng u rominutes test the dynamometer scale beam reading was 42 kg arid the engineconsumed 4.4 kg of gasoline having a ealorific value of 44OOO irvf<g. ,\{r 27 0C and Ibar was supplied to the carburettor at the rate of 6 kg/ min.Find (i) the,brake power delivered (ii) the brake mean effective pressure (iii) thebrake specific fuel consumption (iv) the brake specifie air consrimption (v) th" b.uk"thermal efficiency (vi) the volumetric efficiency and (vii) the air-fuel ratio.

Q3a) An experirnental four-stroke gasoline engine af 1.7 litre capacity is to develop

ma'vimum polver at 5000 revolutions per minute. The volumetic eificierrcy is 7S%and the air fuel ratio is 1;l:1. Two carburettors are to be fitted and it is expected thatat maximum pow'er the air speed at the choke is 100 mls. The coefficient oi dischargefor the ventur0 is assumed to be 0.80 and that of main jet is 0.65. An allo,,rvanceshouid be made for ernuision tube, the diarneter of which can be taken as 1/3 ofchoke diameter. The gasoline surface is 6mm belor,v the choks at this enginecondition. Caloulate the sizes of a suitable choke and main jet. The specific gravity ofthe ga-soline is 0.75. pa and 7'o are i bar and 300 K respectively

b) Explain (any two) of the following:a) Engine Pollurion and the NORMS.b) Alternative fuelsc) Losses sonsidered in Fuei-Air cycle

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[TURN OVERI

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T2225 I T0513 I.C. ENGINEERING

Q. P" Code : 600701

Q.1a)

b) Draw and explain the stages of combustion in SI engine and the effeot of various

Engine parameters on cornbustion'

Q5a) A test on atwo*stroke engine gave the following resuits at full load:

Speecl =' 350 tPmNet brake load:65 kgmep=' 3 barFilel consumptir:n: '1 kg ./ hJacket cooling water flow'rateJacket water temperatrlri) at inletJacket rvater temperature at outlet'i'est room teillperatureTemperature of exhau"it gases

Ail used per kg of fueiCyiinder diameterStrokeEffective brake Ciarneter

Caiorific value of fuel

A tbur-cylinder, fbur-stroke diesel engine develops a po\\'er of 1 80 kw at i 500 rpm' 10

The b.s.,{c. is 0.2 kgliryh. At the k}inning of injeciion pressure is 30 bar and the

maxirn*m cyiincler pr*rrur" is 50 bar]The iijection is explcted tc be at 200 bar and

maximum i-':ressure at the injector is set to be about 500 bar'

Assuming the fbllowing:Cafrsrinjector: 0.7 , iC. for lhel = 0'875 , Atmospireric pressure .

: i bar'

Effective pressure cliff'erence : .{verage p."rrur* difference over t}ie injection period

Determine tire t*:tal oriii.* area requirid per injector i1'the injection takes place over

1 50 crank angles"

500kglh: 20oC= 40oC: 20oC: 4000C

32 kg: ZZcnt: 28cm: lrn: 43MJ&g

Proportion of hyclrogen in fuel : 15 %

Mean specific treat Jf riry exhaust gas : 1 kJ&g Krnean specifis lieat of a steam : 2' 1 kJi kg K

Sensible hent cf water at rooir. temperature: 62k'ltkg

10

10

I-atent heat of a steam = 2250 kJi kg

Finci ip,bp and drarv up a heat balance sheet for the test in KJimin and in percentage'

b) Witlt the help r:f a sketch explain in shOrt the working cf carburettor having

following anangementsi) Compensating jet ii) Idling jet

c) With suitable example/values, pro",ie that, <iuring the {-oad test of an engine increase

ln the load increases rl:re mechanical ef{iciency of the engine'

05

04

A6E0A-59D8F A7 1BC7 52v7D8786E899D I 0

ITURN OVERI

1

T2225 ITO513 I.C. ENGINEERING

Explain an,v four of the following (any four)Supercharging of IC EngineS*'irland its typesRequirements of eooling and Lubrication system.Detonation or knocking in SI Engine Vs in CI Engine.The Pollution control treatments of Exhaust gases of Engine.

Q. P. Code : 600701

Q6a)b)c)d)e)

5

5

5

5

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A6E0A59D8F'07 1BC7 52P7D8786E899Di 0

:flt' S elrn-U C B& \ l'lct't' 2-a\71-2225 i 1-0512 N4ITTROLOCY AND QUAI-lTY ENGINEERING

( 3 Hours )

Q.P. Code:561402

[Total Marks : 80

NB:

l. Question Number I is compulsory

2. Attempt any three qtlestions fi'om remaining

3. Draw suitable sketch to justif,i explanation and assume suitable data if required.

Q I Al Distinguish between Quality arrd Cost

B] Compare Cost of Qualit-" and vah"re of Quality

C] Explain use of Laser Interferometer

D] Explain,,vorking of profile Projector

Q 2 A] Explain the principal construction of Parkinson's Gear Tester

B] Explain the different modes of the Surface Roughness

Q 3 A] Explain Trvo W*ire method used in Screw Thread N4easurement

B] Explain Pitter Gauge interferometer

Q 4 Al Explain tlpes of Cost of Quality with suitablq example

B] What are the objective of quality control

Q 5 A] Explain use of X bar and R chafis in quality control

B] Define " Control Chart " state objective of control chart for variables

Q6 Write shofi notes on any four

A] Tooth thickness lneastlrement

Bl SQC tools

Cl Tool htlaker lr4icroscope

Dl Acceptance sampling

i-.] Consumers Rtsk and Producers risk

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a) What are the three modes of heat transfer? Define each with an appropriate

b) Define Fourier's Law of heat conduction, Newton's law of cooling and ltefan,:"t,'.'*

c) what do you mean by Fouling factor? what are the causes of foulins?vJ r vurur6 rowrvr j yy rl4L 41tr tll(, ui1ustrs ur ruururgrd) Define shape factor and write down the properties of shape factor.e) How convection heat transfer occtu? Wt ut ur. tfr" ai?f...n.., b.r*.., Nahrral

Q-2 a)

Q. P. Code : 600900 :

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b) A brick (k: 1'3 WmK) wall0.l5 m thick separates combustion gases in a frirracefrom the atmosphere air at 30oC. The outside iurface temperature is 100"C while its

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emissivity is 0.8 and the heat transfer coefficient for the outer surface is 20W#K-Find the inner surface temperature of the wall and total heat lost to sunounding by

c) A 0.5 m'plane, grey, diffuse, opaque surface with absorptivity : 0.7 is maintained

11.590oC, With an irradiation of 10000 Wlm2. Determine (i) the Absorbed energy

(ii) Emitted Energy (iii)Total Energy leaving the surface per unit Area. Take StefanBoltzmann constant as 5.67 x I0-8 it^' Ko.

a) For lumped heat analysis with usual notations prove that * - *-EiFo

b) An egg with mean diameter of 45mm and initially at l8oC is placed in a boilingwater pan for 4.5 minutes and found to be boiled to the consumer's taste. For howlong'should a similar egg for the same consumer be boiled taken from a refrigeratorat 4oC. Take the following properties for egg. Verify whether the Lumped heatcapacity analysis can be used or not.K:l0\,V/moC, p:1200kg/m3, Cp:2 kJlkgoC, and h : 100 Wm2 "C.

c) Nitrogen gas at OuC is flowing over a 1.2 m long,2m wide plate maintained at80oC with a velocity of 2.5 m/sec. properties of nitrogen, at film temperature,

?p:L.I42kglm', Cp:1.04 kJ/kg-K, kinematic viscosity (v ):15.63 x 10-6 m2lsec andConductivity(k) : 0.0262 Wm-K. Find the urr.rugl ireat transfer coefficient andtotal heat transfer from the plate. Take the correlation Nu :0,664 Re 1/2 pr 1/3.

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A steam pipe made

Convection and Forced

The saturatedIt has two layers oi'-

of 170mm.lnt air is at 50oC.

thick andcoefficient on

. Find the rate of

T2225 I T0515 HEAT TRANSFER

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Q-4 a) An incandescent lamp is approximated as a 75mm diameter sphere. Thetemperature of the glass bulb of a 60W lamp is 110oC when the ambient air is at20oC. Estimate the heat transfer rate from the bulb surface by natural convectionand by radiation if emissivity of the glass is 0.7. Properties of air at 65oC are1t:2.03 x lO' Ns/m', p:l .044Kg1m5, Cp : 1007 J/kg-K, k: 0.02845w/m-K,Pr:0.7l88'UsethecorrelationNu:0.589Ra(l/4)and.o=5,67xl0-8wlrfil<a. - -:' ,'-'-.i.

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T2225 /T0514 PRODUCTION PROCESS III

Q.P. Code : 600800

Note : l) Question No.l is compulsory. " ' ,,

2) Attempt any three qriestions from remaining six. questions . , ,." i :

3) Assume suitable data if requrired.4) Figures to thc right indicate full nrarks

.

1. (a) Cooling systems used in injection molds Z0(b) Laser Boam Machining(c) Indexing Mechanisms used in Jigs and Fixtures :

(e) Diflerentiate between Combination and Compound Die with diagram

2. (a) Find the total pressure ancl dimensions of die & puneh sets to produce a washer 6of 5.5 cm orttsicle diameter with 2.5 om diameter hole, from material 2 rnmthick, having shear strength 350 N/mm2. Tal<e clear ance 9o/o of stock thickness.

(b) What is Chemical Machining process? Explain in detail with the help ofdiagram. r:

(c) Discuss all sheet nretal operations with help of diagrams.

3 (a) Write short notes on the follorving:'' ---o'(i) Six Point Location principle for Jigs and Fixtures.(ii) Drawing Press Tool for sheet metal.

10

(b) Explain about any five types of Clarnping elements with diagrarns in detail. 10

4 (a) ,,Write about different types of transfer lines using neat sketches. 10(b) What is agile manufacturing? Vri-te about the components of Agile l0

Manuf-ac-turing.

5. (a) Explain,the following: l0(i) Design pr:inciples of cramping elements and any 3 types of

locating elements.(ii) Abrasive Jet Machining.

(b) What are the different elements of Ejection system in Injecrion Molds? l0, Explain any one ejection method.

," 6;-'(q)i

,. '-,'(b),,Write in detail about any five types of Jigs with neat sketches.Explain the following:

(i) Eleotrochemical Machining

,. , (ii) :Plastic Injection Mold Standardization

10

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i\'i.B. I ) Question No. I is cornpulsory

2) Anewer nny Thrce questions from rem*ining lrlve3) Assurne rtrraibitr clata where'er requirecr,.iusttfi, ths same

4) r\nswer to questions showed be gro*pecl ard written togerlrcr,

Qu, I Solve anl,Four

Q. P. Code :600500

[Total ]vlarks : 80.]

(?o)

*) what is the condirion tbr self rocking and self energizing of tlre belt?tr ! Wherc antl lbr what pr:r"pnse a clutch is used? Whaf are tlre tJifltrent rypes oi'clutchest)

E;ipiairi the ivorking of any one type of clntch.L-lxplain epicyclic gear train.I)efine dynarnically equivalent systenrs. State the condition necessary to nrake rwosystems dynamicalty equivalent,Descrihe the gyroseopic effect on sea going vessels.Wlrat is the firnction of govemor? Classifr governor.

Qu'2 n) If'eapacity nl'a single plate clutch clecreases by l3% cluring the inirial rvear peri6cl.determine the mininrunr value of ratio of internal cliameter io externai rlirnreter lbr the sanreaxial loacl. Consider both the siiies of the clurch plate to be ei1'ective. (10)

h) The upper arm of p0rter governor are pivotecl on ths axis of rntatiog. their lenglhs beilg30cm' the lo'uler Anlls fl-re pivoted on the sleeve at a rlistance j cnr fi'onr the axis. theirlengths being 27cm' Mass of each ball is 6 kg and the sleeve mass is 50 kg. Determine rheequiiibrium speed l'or a raditts of rotation of l7 cm ancl also tlre effcrrr and piirver for lttochange ofspeed, (I0)

Qu' 3 a) A vehicle tl1ol/es on a road that has a slope of 150. The whecl base and the Cerrtre ofmas$ al- 0"?2 rn front the rare **reels antl0.8m above the inclinerJ plane. The speed of thei'eltic'le is 45 lcrrlhr, the brakes are applied to all the four r,;heel.s anc the coefficient o{'liiction is 0.4. Delertnine the distancs moved by the vehicle before corning ro rcst a6cl theti*e taken ro do so if it moves (i) up the plane (ii) dorvn the plare. ( r0;

b) [n a l{artnell governor. the raditrs of rotation.of the balls is 6CImm at the nrinirnum speeciof ?40rprn' The lengtlr of the ballarm is 13Ornnr ancl ol'the sleeve arrn 80rnm. the mass r:1.eaclr ball is 3kg and of the sleeve '{ kg. 'fhe stiffness of the spring is 20 N/n11, Derermine{ii I'he speed when tlie sleeve is lilled iry 50 rnm. (ii) the initial compression.l'the spri*g.tiii) I'he governor ei'fnrt. (iv) The power, (i0)

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DF85B2CAF8DDC703 I 93 6.t 9392A7 6A4 6

ITURN OVER]

Q. P. Code :600500

2

Qu, -l *) Derir,,e an expressi,on itrr finrling "angle of heel" of a two wheeler negotialing a ilrrfi.(10)

b) A cast ir.qn i11'rvh,-etr is r'cquireci to absorb 2-5(i00 N-rn of eri*fgy as speetl is increased

lrr,nr l?0 tc li5 rprn. II'rvheel is to be sotid disc having a diarneter 8 times the thickness.

( l0)l)e tcrnrinc itn ,.!iarrrcter. Dcnsitl' of C.l.=7200 kg/nrl.

Qu.5 a)Ahorizontiil gas*rrgirrerr-rnningat200rpmhasal::oreof'210rnmand&stroker:t'4?t)mrn, J'ire ionnecting rod is 92:i mrrr iong and the reciprocating parts rveigh 18 kg' u'h*n

ti'tr: cl'rinl( lras tLrnrct-i ihrglrgh an angic of 100 f-rcnr tltt: itrner dead cenlel', the gas pret;sr.ll'cs

lrr tire {:ovcr' and lhe st'anii sir"les are 500 kidirn] ancl 50 kNim? res;rer:livci1,, l)ianiq:tet' ol'

rhr: pistorr is 4()mnr, Deterrline {i) turning monl*rlt on the crrurii shal't, {ii) tlrrust on the

bculings. {iiii accelcration qrf the llywheel r.vhich ha$ a tirass o1'8 kg and r;iclius at gyration

of'600 rur: ivhite the porv*r of engine i;22 kW,

ir) in an epir,vclir ge*r rrain as shor.vn in llig. tr. the wheel C is.keyeil to shafl B and rvheel

Ir is k*te cl to sirall A. rhe rvheels D and E rotate togeil:er on a pin fixed to arnr G. tlte ttttnrber

ul'tr:eth on ,,r.'heeis C, D" E and F are 1S,65" 32 srnd 68 respectivellr"

il'the shafl r\ rolates a1 (r0 rpnr and shafl B rcrtates nl ?8 rpm it opposite direcliolt, tind tlre

spceii :riid dircciion cf rcrtation of anrr C. ( I ti)

Qu. t aJ l:xpiair, Iloge ]rralie clynarnonieter. {1}$)'i:l Write a I'rc)te on Co"efficient of insensitiveness o'l'govemors. {05)c) A rnulti-platc clutcir transtnits 55 KW of pou,er at tr 800 rpm. Coefticient ol' flictionsurfjrce is 0.i. r\xial irrtensitv of pressure is nor to qxceed 160 kNlmz.'fhe internal radir.i*qrs B(Jmtn anrl is 0,7 Liutes the ext*nral raciius. Irind the nunrberoi'plates neecleci ro ti'a,lsnrir

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thc reit rrirei tor1'pl*.

DF85B2CAF8DDC703 I 93 67 9392 A7 6A45 6

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