as. EJ~c::trost~tic,Preclpitatoris In~alledbetweeri~) Induced draftfan and chimneyoJ Air Preheater and Induced draft func) EconomiserandAirpre he$te'rd} B9i1erfurnace and aconomlser

04. Vacuum c,ai'lbe.lTI~asuFe;dbVJJSlrlg'~) Rotameter'b} prto.t tubec) U'{t1bemarionj~terd)' yarifurhnetet

J

!iT U~ing!~gequaotity 'pfwa~et~l tilipling I~r~~quantiW orcoa]c) u.sing high tem:peratui'e andliigh pressure of stea IT!d) 'D~~r~asint~hl~ad6nthe.pla:nt

0:3, the steam power plant'effidencY can be:improved try

02. In a ,superheater ", ~

13. Inpower un!t, 1metr!~Hp=a) 746~Olwattb) 750wattc) 735.75wattd} '1:20watt: i.

14. 1 KC~I;:4.187 Kl =---... BTUa) 1.80~} 2;205'c) 9.969,d) 3.08

11. What.is the impact on.:flo~ and dis,chargepressure whenthe Impeller of pump is trimmed?a) Flow decreases with Increase pressureb} .Both flow and pressure Increasesc} Both flow and pressure decreasesd) FJow Increases wit~decreased pre5~ure

12~ Themaximum he~t .lqssUta ;bQil~ro~c~rsdl,l!,!to.a) 'Unburnt'carbonb} Dry flue gasesc} Radiation lossd) Moisturein ruel

08. Water at pressure 4 kglcm2 and 1600Cte'mperature, when exposed to atmosphere wirJa) Start boiling ,,> ~b) Cooldownc) Remaina~'itwasd} Flash and getconverted into-steam

09: Proximat,eana Ivsisofcoa. :8jve'S~!tefollpwing result:a) Carbon, hydf

2G~ What will be the proportion ~yvolume of cement, sand and gravel commonly used in power plantin preparation of St:~ongest!;oncrete mi'xture iQ that order?a) 1::3: 5,b) 1:1~:3c) 1: 2 :'4d] 1: 4 ~,5

21.. Low carbon steel c6ntairlS'a) O.l % to 0.27 % carbonb) O.6%tol.S%carbonc) 0.2 % to 0.3 % carbon;d) 'None Dhh~ above

22. Opacity rl)eter is used ,to measurea} Feedwater pHb) Dissolved O~genc) Stack emission in SPMd) Drumconductivity

..... -,_" -~l@llic:!l'~;lgas~ilpnev dependson:

.'. .'.....'in thff&It"~: . .' "b) Temperatureof.exit fiue

. ,

30. Any tube lsdesignaled bya) Not., jrja; thicknesstil rl40U'litl3.1t;>cm;~c) 10. -, Inside. djame~erd)' OD '" OutstCle diameter

. .2~; An? pipe 1$desig~~~ct.i~y',a) Sta.ntiatdttiicknes5;bJ 1f):_J~ile.(jt~met$roj N~rqi"f;ll bore(I) None 9-f'above;

28. Pure steam and'Watettlte non~cooduct~nce 9T e'ectriCit'f'b~t:asthe'iniPot'ity jl'u:;reasesa) The condu~jVJty re~aj,.ssam~b) The CoridiJdMiy decreases.c) The..cond~.:tMtviru:r~a$$d) Noneof ~bo~e . . ..

27: SilIca has a tehdertcyto evaporatewfth;ste.arn~ . '.-::' -,_-. - '! "./. ',>

a) At.~emp~ratu.~>2QQo(!6) Atpressu.re>80 Bar

. c) AtpreS$ure)~.&OBatd} ;NoQe Qr~boye

;:':, ., : ..' -"'" ,-':'~ :.-'" ", ' "-' "-, ,,' ' ,:~'-'t.thCrj~i~1~ii'lt,.thewaterali~.~,arri~~rl$itV~OU'le~Equal,;.

-. ..'

2S. ' The density ofsattlrat~d water at 100,.0is..... '. :. .. ...... '.3a) 9.58kgfmb) 9~Sa:kg/cmlc:) .958 kf!Jrn3d) None f?fabove

24 ~el!i'JI' j;io C()l:l1~e$:iive",apour ana obeys~.) al~laWs~ofUquid$b) aUlawsofgasesc} aUJaws,ofsdUds,d) aUf-ilWs ifbov.e

(6)

(4)Whalis browQoWnofsafety vahle and how is it regulated? How do you take steam t~st&oiler.inbTief? ' ......(.. .

catculate the increase in volume enclosed by a boiler shell 2.4 mtrs. long and LO rntrs,In diam~fer, when it fS subjected to an ii'l~ern~1 pressure of ~6 kg/cm2 Tile wallthicknessjs.W~h that-the maximum' tensile stress in the shell js 215 kgfcm2, under thispreSSlJ,fe.Take E(rnodulus of elasticr~) ='2.0)( 10' kg/cm2 and poisson's ratio = 6,28. '

b}

Q.S~

(4.}.,,/JV What is furnace explOSIon? Explain lndetall conditions cause furnace explosion?

tubes. half of shell s}Jrfaceand hvo.third~ 'Of tube plate area, less the area' of the tubehOles. 6

......Q

FirMtli~her and lower ca1()rrfl~valyes of fuel oll,Take sp.edfichei:lt of water: .tiS7 KJl~G Kahd 'enthalpy"of evaporatiof\.of ~~e,~ml:}s2275 Ki/KG at atmosphertc pressure. .

, '

~-;-"'~,-~,,~~,~ ,~~"

.....--specificg,ral.lity of fuel o.iI ; 0;84, Ma'$~ ()fw.ater in calorimeter:. 2\5 kg; Water eqLlivalent OfI calorimeter: SSOgm, mass, of sl:}mple offu~1 aU ;1,2 gmj temp~ratUreof water In calb,rirneter, before c6mbustio:1' :19.5 "c:.tempe~ture afwater incalorimeter after combustionz 23;7'2"C

\0

(lO)Aboiler consumes.224tons afeoa' toprod;uc~18154to?S of ~teal11per day.The steam is pry,saturated at90'at~: Calculate the, ~Pilerthermal efficif~h~VqnC!eqQlvalent evaporation pet ton:ofcoal. Ift,he calorific value of ,:;oal is Zl649 ,k:J/kgand entnalpyoffeed water being 425.036, ,Id/kl!,of:water.

(4)Ges.;;l"fbeth e safetY pfol~,ctToosyStem of high pres~ure bOIlersA

.~'

~'

" . .... ,. .... .,i'or furnace and;:boner,tlJb~s, permis~ible.nietatt~m per(ltute is saturation lempera!l,jre;

PagelofG

3) Caustic gougins deStroys prowcuve film byA~ Dissolvingc~fb.:onates'sca'e8. Dissolvingironandmagnetite to form sodlumferroate-C. Dissolving silicate ScateD. Depositing metal hydroXides

, .

2) The fusible plug insmalf bot1ers ~ lotatedA.. 1nthe drum 'B. Inthe firetubesC. Above steam dome0. ~erthe combustion chamber:

,',

Marts-30Please mention correct.answers for following questions., . ,. .

f"lgUresto.~ righ!.tnd~te full marks;Attempt.aH~~o-,s.

Oate - 27,;n9...2014~saturday

BoilerOperation EogirleerExamination - 2014

G'UJARAT "BOILER EXAMINATION -BOARD

~sEQmNo. _

PageZof6 .

9) Ina superh~'A. Press4r~,~,tcinperatur~,~rops,8. .'PreSSure rlses~'tempeolture remains C()ristantC. PJ"es$Ure n~fu~m'sConstant:aJld\~rnperntUrerises0., 80th .,ressure, ~n~timlperature rernaiJ)$,ri$tilnt

~O) Minimumdiameter'OfbOilet safety ~I~ as J)el"'lmO~A. lS~OmmB,. 19.0mmC. ~2..smmI). 50~Omm

N;. , ron. ", ~.~-.. ~~ ,

'-"'~:

JPage30f6

11) The'efficiency

page4 of(i

24) fishmouthoperiiJ:l&;:is ..... ~ to desaih:eA. PAfan impeDeraadc:sB. sOifer tube failureC,., :Mill gear cracksD, Noneof the above

. 23) 1fVd~'iS~,OnA. BOilerdrum '

.. :..

,~.'

Page50f6

,'!til'll. ).Whkh 01"'- L.n .'. -~ illfire tube boiler;;!IV ~R; 1~0WIl18 .s ._ ..A. CocilranB. lancashireC. LocomotiveD_ Balx:odc and Wiloo~

'Co velox,0. latnount

Z8Un steam tu"'nf!'PQwer plari,,':d.Je lowest pl'e$ure octurS inA. Tu~ine (nlet 'B. Boit~rc. (:ondenser .D. Supet heater

Z71Steam'pipitmeariS:'anyfpipetlWqu~which steam passes if"'F*l!t\%~j~~%;fi\..",+;:,~;APressure exceed 2.Q() kg/cm2 and to. is 250mm

':~,ressq:~exceed 2~50kg/an2 and 1.0. is 100mm.. ,~. '".c, ::pf~ure. exceed0.15'kg!cmi and I~P.is300mm

: O. Pressure exceed !?:.OO,kg{an2 ~n(H~O.Js;150mm.;0'

2,6) ~~'any~vessel ex~~wbichis used ~press(yfOl'generatingsteam'under pressure,A.. 2.:75 utets8. 20C)I~rsC. 25litersP. 22.;15 liters

25. fn'~b,OiIer$e:~pressure is seen in theA. DrumB. MainheaderC. SuperheaterO. EconomiZer

JPage6of6

_,...,nd .of.Paper-

\ (8) ~lain foUowing terminology.

l~ flyASb'2. Secondary Combustion3. SecondaryAir4. Hagged FuelS. Windbox

s. Fee1.Steam for proc~S$Hellting.

What is full fann of pH of water? EXplain effect Qf various pH value of .~eedwater onand Howwill yottcontr()1 it? Descrjb~D.M.water treatment plantfn details With

Marlcs-20

~ Why force

..'

15) How many lifting lugs are there in the boiler?

8) What is the thickness of reversing charnoerback end plate?

9) How many circumferential seams in tile boit~.;ell?

10)What is distance betweennormal water lev~'~ center 6f the boiler?s

11) What is the distance between tower water .j:' j;n gauge glass and top of thetube nest? "

12) How many circumferential seams in each f~f~~?

13)What is the minimum thickness allowed for furnace?

14) What is the depth of corrugation?"

Q.2 Write the answers only in the drawing sheet against the question numbers.

(a) Read the drawing shown in fig. 2 for package boiler and answer following questions. (15]

1} What is breathing space between furnace to shell?

2) How many total manholes are there in the boiler?3) What is the flatplate margine between gussets and shell?

_4) How many long stay bars are there between front and back end plates?

5) What is inside length of the shell between end plates?

6) What is inside length of second path tubes between two end plates?7) What is p,lteh of corrugated furnace?

(30jAnswer ANY TWO ofthe followings,

(a} Drawwith standard dimensions the 2;1 Ellipsoidal dished end with foHowing data.

Inside Dia. : 3600 rom, Straight Face: 50 rnrn, Thickness : 10 mm, Inside Heightwithout SF ; 900 mm, Total lnslde height with SF: 950 mm and Total outside height:960 mm,

(h) Draw deep Torrlspherical Dished end with following data.

Out side dla. : 100 mm, Thickness: 10 rnm, Knuckle radius: 15 mm, Crown radius:80 rum, Straight face: 10mm. Mension total outside height with SF.Also Menslonmaterial for viorking tempertaure upto 3000C.

t/~) Draw the assembly drawing. in sectional elevation of the Thermo Well for temperaturegauge as detaHs ate shown in Fig. 1. Label all the dimensions.

0.1

1001VlarksOt.28-09-2014 Sunday Time: 10.30 am to 2.30 pmlnstruetions: L Figures to the right indicate full marks.

2. Assunrc suitable data if required mld justify.

GUJARAT BOILER EXAMINATION BOARDBOJ1...R Of'ERATION ENGINEEI< EXAM2014

PAfER-3: DRA \".rING

Candidate 's EWlIl1 Nil.

P i /b'.:: ..':..

andmountings.(d) Draw the sketch of the Flash steam seperatcr with tine diagram showing different

connections and mou~ti'ng~'for:mediumsteam pressure.

[20]Answer ANY two of the followings.(a) Draw standard shorl radius 1800 return bend for following dimensions;

Nominal pipe size: 50.S mm, Center to center distance: 102 mm, Back to facedistance: 81 mm,Ou: side diameter at bevel: 60.3mm

v{:br Draw standard eoncentricl,9Qucer 2")(1" NPS for following dimensions.Large end outside diam~"ak:ff~bevel: 60,3mm, Sman end outside diameter at bevel:33.4 mm, End to end diatance : 7'6mm.

" , "l"(:' 1'1~'!\__)e} Draw the sketch of the-De~erator with line diagram showing dtfferent connections

Q.4

10) How many inbed tubes are there in the bed assembly of the bolller?

11)What is the pitch otthe inbed tubes?

12)What is the center distance between first and last lnbed tubes?

13) What is the distance between centers of the headers of the ecenomiser?

14) What is the value of ligament of the top side water wall header?15)What is the distance between the bottom of the steam drum and top of the water

drum?

~udraw the riser tube with header in the scale of 1:20 as given in the rigA. [101

(b) Redraw the screen tube with headers in the scale of 1:20 as given in the Fig.5. [10]

p-2./G

(b) Read the drawing shewn in Fig: 3 [or water tube boiler and answer following [15Jquestions,

1) What is outside diameter of the water drum?

2) How many numbers of rows of bank tubes are there in the front and rear side ofthe bolier?

3) How many soot blowers are there in the bank tube zone?

4) What is the diatfleter and thickness of the front water wall tubes?

5) How many numbers of tubes in eachof the left and right side water walls?

6) Wltat is the inside diameter of the top riser?

7) What is the height of the center of the burner from the working platform?

8) How many headers are there in the econor1iser?9) How many nozzles are there for operational controls on the headers of the

economlser?

Ip- ..8s.:/6I:: '.I.- J.8

.061,

$,~t~:;(I

$'

P 4(iiJ / b

,I

.~, ..;..---< ~

E'.

~3;0&:k~4:;

If"~\J...I--

c-f\"

{'r-,'{'-,

'.....p

\l..__[(\la...

.,"01'(I..

, -,,'-I

e1 ~(

'it\

Eli:~Ct >'

'$f. V'\"A ' .r ../ ,I- r\1 a: .;.-!

rI

-i;

-'.,.,-

~~,~~N.

jj,

1,Il

Paper I.pdfPaper II.pdfPaper III.pdf