Energy Conver. Systems

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B.Tech (sixth semester) Examination April-May 2010Subject: Energy Conversion SystemsBranch : Mechanical EngineeringTime: Three HoursNote:q) Aftempt all parts of a question in continuity.(ii) All guestions are compulsory arr,C carry equal marks.(iit) Assume suitable data, if necessary.Q,I. Solve flny one out of a oncl b,

., a. An aircraft from Raipur to Mumbai flies at 1000 kmph. Its turbo jet engine takes in 42kg/s of air and expands the gases to the ambient pressure. The air-fuel ratio is 50 and thelower calorific value of the fuel is 43 MJ/kg. For maximum thrust power determine:l. Jet Velocity2. Thrust3. Specific Thrust' 4. Thrust Power5. Propulsive, Thermal and overall efficiencies6. TSF'C

t6OR,, -.,- b:-Q$le 9-\nrgssiorLfn" air standaELefficiency (rliJ nf the irt..l cvcle nfj.t engine in termsof pressure ratio of compressor. Start derivation by explaining various figures likeschematic of gas turbine power plant for aircraft propulsion, lay out of principalcomponents, simple open ideal cycle and actual cycle on T-s diagrarns.l6Q.2. Solve sny one out of a ancl ba' A rocket that is supposed to move with the thrust of 7 kN has Nozzle exit diameter andexit pressure l0 cm and l'02 bar respectively. The ambient pressure is 1.013 bar,propellant flow rate is 0.5 kg/s and thrust chamber pressure is 20 bar. Determine theeffective jet velocity (c), actualjet velocity (cl, specific impulse (I), and the specificpropellant consumptio n (SpC).t6OR

-o,'t Describe mathematically development of thrust in a rocket and derive its expression.Define specific irnpulse (Is) and specific propellant consumption (SpC) and also explainits significance using mathematical expressions.

Code: MEl0613

Maximum Mark: 80Minimum Pass Mark: 28

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cswu Code: MEl0613B.Tech (sixth semester) Examination Nov-Dec 2010Subject: Energy Conversion SystemsTime: Three rrours Branch: Mechanical Engineering Maximum Mark: g0Note: Minimum pass Mark 2g!:l A.ttempt all parts of a question in conrinuiry.(it) 'AIl questions are compulsory and iarry eluat martcs.(iit) Assume suitable data, if necl.rury.Q.1. Derive.any two of thefollowingfor air craft engines.a' combustion chamberbfficiency"= ratio of th! theo"retical to actual fuel-air ratio.b. Flight to jet speed ratio

trAev J- gri,re- {1c. Thrust in a turbojet engine e ?tr = *\* {c:-%} : #1*- { tu *1}=i u i F* - P*'irt*d. TSFC= (Fuel-air ratio)/(Specific thrust): ."

state the assumptions used in the dorivations of the above expressions.\

Q'2' E:glain briefly.the meaning of thefolrowing terms anyfour.a. Bocster rocket stage.b. Retro-rockets.c. Sustainer stage.d. Earth satellite.e. Stationary satellitef. Coastlngg. Burnouth. ICBMi. IRBMt

Q.3. Solve any one out of a and ba. At what time does solar noon occur at Delhi on Februarycorresponding to 10:30 AM standard time on 5th June at77.128), E=-14.5 minute, Standard longitude=g I.738.

a,e-1U

1615? What is the solar timeDelhi? For Delhi (28.38N,

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CSVTUORb' calculate the sunset and sunrise hour angles for the longest andin (i) Sanfrancisco [37.83 N, 122.38E] . (ii) paris [48.8 N 2.33in hours?.

Code: MEl0613S

shortest days of the yearEl. How long these days

t6Q.a. S2!u9 any one out of a and b.a' what is the principle of biogas generation by anaerobic digestion process? Describe aGobar gas plant.ORb. Explain the following in relation to biomass(i). Combustion(ii) Thermo chemical Conversion.(iii) Bio chemical conversion

Q.5. ,\boutGeothermal energy describe the follcrwings any two:(i). Binary cycle geothermal power plant.(ii). Petrothermal system.(iii)'compare the performances of various types of liquid -dominated geothen,ral powerplants.

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esvru Z?eelG ?-*a'e?-w eode: ME095I3-"TT,-#-u:ffhi::&'ff*"3*?ff8;ff-L Apr' : lviav 200eBraneh; Meehanieal EngineeringTime: Thnee l{ouns Max &Xantess 80Mrn Pass Marks:2E

Note: 1. Solve any Five Questions" All Questioqs earry equalmarks2" Answers must be speeifie. use appropriate words for desenption.__ _i._Eq3ipygur_aPgryefg_wi4 sgitable diagrams and neat sketehes.-4"Xs. 1. (a) Defrne the tem usolar eonstant' and 'solar insolation' and exptain the parameters thatr- affeets solar insolation.

(b) Deseribe foeusing and non-focusing Wpes of solar colleetors and highlight its applieatronareas"Q"No. 2" (a) Illusbate the working of Horizontd. Axis Wind Turbine with the help of suitable sketehan{nighligbt its ments and demerits"

(b) Indieate the origination of global wfrd with the help of neat sketeh and explain the foreesresponsible for direetion of global wind., .,-,*4*.?;s'*Hffi :*:#ffi J,";T,1nTn:ffii::,1?'J::,ffi il#i#,iffitil.ilS:Hjtr"(b) Describe the working sf Gas press-urization system of rocketbnginesLnd highlighr itstrestls end limitations

Xo"f.Ji)"pinlain the"work*g ptuiple of Geothermal Energy with the herp of fic,w uiagfam andf highlight its ments and dements.(b) Disting-uish clearly between'Tidal energy eonversion systemu and'wave energyoonversion system ' and emphasize their merits and demerits.Q.)'{o.S. (a) Explain the tenn 'Thermal Jeto and 'Rocket Jet' and desenbe the merits and.\-./ dements of thermal jet based engine and roeket jet based engine.

(b) Explain the working of liquid bipropellant roeket with trelp of neat sketch and highlightits merits over solid propellant rocket.Q No" 5" Distinguish elearly -between the foliowing(any rwa)z

L Fixed dome biogas digester andrfloatrng dzum biogas digester"il. ta-Mont boiler and Benson boilcr.JII" Solar insolation and Solar eonstant.nf. Global wind and tocal windV. OTEC system and MI{D system.


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Time: Three Hours

Code: ME08613B.Tech (Sixth S emester) Examination N ov. Der 2008Subject: Energy Conversion SYstemBranch: Mechanical Engineering Max Marks: 80Min Pass Marks: 28

Note: Solve any Five Questions. All Questions carry eqtml marlaAnswers must be specific. Use appropriate words for description.uio vour answers with suitable di s and neat sketches.Q.No. 1. (a) Describe solar energystorage methods under following heads(any two):'I' Solar-Thermal Storage.II. Solar- Electrical Storage.m. Solar-Mechanical Storage'

(b) Distinguish clearly betweenthe following (anytwo):i. OTEC and Geothermal EnergY.II.. Solar constant and Solar Insolation.III. La Mount and Benson Boiler.(-Q.No. )r.1afOescribe flre working of Pulse-Jet engine with the help of neat sketch and highlight itsVaPPlications.. -..,._r6f n"plain the workingof Pump pressurization system and higtrlight its merits andcotnplextttes.a.Nq.3.-g) Expiain the working Rog\e! Jet Engine anci cornment on its applications.

,_Wg{"nguish clearly between'Thermal Jet' and 'Rocket Jet'based propulsion system.Q.No. 4. (a) Explain the term 'Wind Energ,v' and describe the origin of giobal and iocal wind.

(b) Expiain the term Geo-thermai energy and highiight its advantages and disadvantages overother forms of renewable energy.

Q No. 5. (a) Draw a neat sketch of floating dmm type bio gas digester and explain its working.(b) Explain the necessity of biogas digester and highlight application of its product andby-product.

Q No. 6. Distinguish clearly befweenthe followings (any two):I. Focusing and Non-Focusing Solar collectors.{:I- Solid propellant and Hybrid rockets.\ iII" Gasifiers and bio gas digesters.*A , lurbo Jet and Ram Jet engines.V. MHD power systems and Wave energy conversion.

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Time: Three lfours

Code: M808613B.Tech (Sixth Semester) Examination ftir. ZOOSSubject: Enerry Conversion SystemBranch: Mechanical Engineering Max Marls: 80Min Pass Marks: 28Note: I . Solve any Five Questions. A1l Questions carry equal marks2. Answers must be specific. Use appropriate words for description.

3. Equip yow answers with suitable diagrams and neat sketches.Q.No. 1. (a) The incident beam of sunlight has a power density of 7000 Watts/# in the directionof beam. The angle of incident is 60'. Calculate power collected by the surface having total

area of 100 m2.(b) Describe the global availability of solar energy and highlight the main application of solarenergy.

Q.No. 2. (a) Illustrate the working of TurboJet engine with the help of neat sketch and highlight its@i'-: applications.t (U) Describe the workingof Gas pressurization system of rocket engines and highlight its- merits and demerits.Q. No.3. (a) Explain the working principle of OTEC and Geothermal Enerry. Also explain whichone is better and why?

(b) Distinguish clearly between'La-mount Boiler' and 'Benson boiler' and emphasize theirmerits and demerits.a.Nq4.(a) Explain the term'Thermal Jet' and 'Rocket Jet' and derive thrust equation for air-,-breathing engines.

;4p Explain the workingof hybrid rocket and highlight its advantages and disadvantages over3ol id propellant rocket.Q No. 5. (S Explain the forces that cause 'Origin of Wind'. Also highlight the term 'HadleyCii:culation','Rossby circulation' and' Trade wind'.

(Q Explain the process of production of biogas from biomass through anaerobic digestionprocess and sketch a neat diagram ofsuchdigestor.

Q No. 6. Write short technical note onqny two of the followings:\' f,' I. Wind Energy and its applications.- U. MHD power systems and its advantages.. III. Geothermal energy ard its disadvantages.,- \ IV. * Air breathipg engines and its applications.{q' V. / Biomass energy andits Applications. )' r.U Q,o.r 4

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Energy Conver. Systems