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7th Semester Mechanical Engineering (June-2016) Question Papers

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- 1. USN 10ME71 2016 Engineering Economy Max. Marks:100 Note: 1. Answer FIVE full questions, selecting at least TWO questions from each part. 2. Use of di,screte interestfoctor table is permitted. {J () o c0 o o !Qo 6! -o r' h0 cco .= c.t (Bs k50 x() eO a2 o() c0i -o>! !wJ ,5-o o! c. 5. oi a.Y 6= 5io aLE 6e r^9 -5I) uo tr> o- L-r< ,i 6i o o Z c* la. b. c. 2a. b. 3a. b. Time: 3 hrs. i: t2%. 4 a. Fxplain: (i) MARR, (ii) IRR, (iii) Depreciation. b. Explain briefly the causes of depreciation. c. A CNC machine costs {30,00,000 is estimated to value is estimated to be 2,50,000. Find: PART _ A Differentiate between: i) intution and analysis, ii) Tactics and strategy. , Briefly explain the law of demand and supply compounded quarterly ( interpo late if -nece ssary). Explain the future worth method of comparison. (06 Marks) (05 Marks) (06 Marks) (06 Marks) (05 Marks) serve for 8 years after which its salvage (08 Marks) (06 Marks) A loan of {10000 borrowed today under an agreement that t14000 is to be paid sometime in future. When should the payment be made, if the loan earns interest at a rate of Yo Two types of trucks ilable fo The details are as follows:of trucks are avarlable tor transooftatron use. 'l he detar Particulars Truck A Truck B First cost ({) Maintenance cost (t) (Annual) Estimated Salvage value ({) Estimated life [0,00,000 20,000 2,0o,ooo 5 years i5,00,000 15,000 5,00,000 10 years Both the truck deliver same amount of work. Assume interest rate of 7%. Which truck is to be preferred on PW case. (10 Marks) c. A NGO received funds of {10,00,000 from the government for the construction and up keep of the administration building for 10 years. Annual maintenance and salary of the staff estimated to be {20000 for the flrst year and likely to increase l0o/o every year upto 10 years. In addition t25000 needed for painting every 5 years. The NGO has to make own affangement to earn revenue for perpetual maintenance after 10 years. What amount remains with NGO for the construction of building if fi% interest considered? (05 Marks) Write notes on: i) Ownership life, ii),Accounting life, iii) Economic life. (05 Marks) The flrst cost of an asset is {5,00,000. The annual maintenance in the first year is t2000 and increases by {1000 every year upto 1Oth year. The annual income is expected to be {50000 in the first year with increase of t25000 every year upto 10th year. The operating cost is {6000 per year. The salvage value is t30000 at the end of 10tr'year. Find the equivalent annual cost of the machine at l2oh interest rate. (08 Marks) ,c. An asset was purchased five years ago for t52000. It was expected to have an economic life of 8 years at which salvage value would be t4000. If the function of the asset would no longer needed for what price must it be sold now to recover the invested capital when i) Book value of machine after 4'h and 6th year by declining balance method. il) Depreciation fund during 6th and 7'h year by SOYD method. iii) Depreciation charge by straight line method of depreciation. (08 Marks) 1af 2
- 2. USN Time: 3 hrs. 2a. b. c. U. 8a. b. t,. ronnnzs Max. Marks:100 (05 Marks) (07 Marks) i07 Mar[<s] (06 Marks) (06 Marks) Seventh Sernester B.E. Degree Examination, June/Juty 2015 Hydraulics and Pneumatics 1a. b. c. -: () o cd E o! (JX tr^- =t'-oo ll cco .E c o<sO ?a, dX o() b4i >!,6 d- 96 -a c) 'ia oj= IP trc. .(JE tool; (!E lro 6.Y>'(k ooo c 01) *dl F> o (-.) < - a'l o o L Determine the volurnetric efficiency of a gear pump of, external diameter and internal diaraeter of gears 75 mm and 50 mm respectively and width of gear teeth 50 n:m, if the Note: Answer FIVE fwll Ewestioms, selecting at least T'WO qwestions fro*w ewch part" PART _ A Sketch and explain structure of a hydraulic control system. Expiain the construction and working of a external gear pun1p. actual discharge is 30 LFM at 1800 rpm ILPM: Liters per min]. Sketch and explain the working of a swash plate type piston motor. Sketch and explain double acting cylinder. Sketch and explain pressure dependent controtr circuit. Explain the principle of cascade controtr system. 4 a. Sketch and explain the operation of a hydraulic circuit for the controtr of a spring retum-single acting cylinder. (06 Marks) b. What is regenerative circuit? Sketch schematically regenerative circuit tc increase the extension speed of a double acting cylinder. {06 Marks) c. What are hydraulic accumulators? Sketch and explain dead weight or gravity accurnulator. (08 Marks) PART _ B 5 a. What are the desirable propefiies of hydraulic oil? Explain them. (08 Mar[<s] b. What are the main functions and secondary functions of a reservoir? Classify them. 3 a. Briefly classify valves based on the type of function perforrned. b. Sketch and explain the constructional features of poppet vaive. c. Sketch and explain pressure Compensated flow control vaXve. c. Sketch and explain fuli flow filter. 6 a. What are the characteristics of cornpressed air? Explain ttrrem. 6. Sketch and explain structure of pneumatic control iystem. c. Sketch and expiain rodless cylinder. A hydraulic motor has a volumetric displacement of 123 cm3. lf it receives 0.0009 m3/sec of oil at 50 bars. Find (i) Speed of the motor (ii) Theoritical torque (iii) Theoretical power of the motor. (08 Marks) (04 iVlarks) (0S Marks) (8E Marks) (06 Marks) (06 Marks) (06 Marks) (08 Marks) (06 Marks) 7 a. What are flow control valves? Draw graphical symbols for F.C.V. (s4 Martcs) b. Sketch and explain consttuction and principle of operation of a quick exhaust valve. (08 Marks) (08 Marks) (06 Marks) List advantages of solenoid controlled pilot operated directional control valve. (s4 Marks) List different types of compressor. Explain with a neat sketch production of compressed air. (10 Marks) >f*rk**
- 3. USN 5a. b. c. 10ME,754 2016 Max. Marks:100 Seventh Semester B.E" Degree Non-Gonventional Time: 3 hrs. 2a. b. (f o. e {.) d (J ()X o-,- &. (!9 *"oli eca F,I dO E9 $2 Od UO E-Y bod -o>! OE :q ,: o. oi a.2 o: GE =v > q' E Or] '-E 6= :t9 LJ< *C.l () o Z $ ! c- Note: Answer *ny FIVE full. questions, selectiwg atlesst TWO qwestions from eack part" PAR,T _ A a. What are the conventional and non-conventionai energy sources? Explain briefly. (08 Marks) b. With sketches, explain the production of oil from ail shale and Tar sands. (12 Marks) Explain the working principle of pyrheliometer with sketctrr. Define the following terms: (10 Marks) (10 Marksi (r) Latitude (iv) Hour angle (ii) Zenith angle (v) Local apparent time. (iii) Solar altitude angle a. Explain beam, diffuse, reflected and total radiation flux on a tilted surface. {07l{arks} b. Calculate the monthly average hourly radiation falling on a flat-plate collector fa"cing south (Y: 0) with a slope of 15o, given the following data: Location : Chennai ( 13" 00' N) Month: October t* : Z+Oa kJim2-h Time : 1 100 - l20ti h (LAI') Ia : 1073 kJ/tn2-h Assume ground reflectivity to be 0.2 representative day in October (October 15th) los tttarks) c. Name the different types of solar thermal power cycles and exptrain any one type with a neat sketch. (88 Marks) a. With neat sketch, explain liquid flat-plate collector. (10 Marksi b. Plot the variation of r. , tu and r with the angle of incidence lirr the follovring covsr system: Material: Glass Thickness of each cover : 4 mrn Extinction coefficient of glass : 15 mr Number of covers : 2 Refractive index of glass relative to air : 1.52 Angle of incidence : 15" PART:B With a sketch, explain principle of working of a solar cell. With a neat sketch, explain the vertical axis wind machine. (tr0 Marks) {SE &,[arks) {S4 Marks} A wind turbine generator is designed to produce 3.5 x 106 kWh/year with a plant coeffrcieni of 0.45. The conversion efficiency is 0.73. The mechanicatr, generator etficiencies are 0.9 and 0.96 respectively. The wind velocity is 45 kmph and air density of 1.185 kg/m3 and a temp. of 25'C. Calculate the required rotor diameter and power cr:efficient. (08 Manks) 6 a. Explain the harnessing energy in Tidal power plant with a sketch. (sE Marks) b. With a neat sketch, explain the working principle of OTEC (closed) fhnt. {08 Marks) c. State the environmental problem associated with geothermal energy conversion. (S4 Marks) i of2
- 4. rl ta. b. c. d. 8a. b" What is anaerr:bic digestion? With a neat sketch, expiain the Indian bio-gas plant. Write brief note on Energy Plantation. What are the applications of Bio-gas? 10ME754 (02 Marks) (10 Marks) (05 Marks) (03 Marks) :-'" (10 Marks) ,*t What are the clifferent methods of producing hydrogen? Explain any one of them. {10 Marks) Write brief notes on : D Transportationoflhydrogen ir) Storage of hydrogen A8*ak* .t i , ..,i" '.ii],j 2 of2
- 5. 10M8761 d(.) () ! C4 63 a () ! Eg X- (d9 oo .E&(d$ ()trda o! ;;:! iJo 6cd -o>e -664 9A oE p- 5, tra o'i Edgo @t; !O =+ >- q- ooo eo0 o= =d+ !.) :o xe ci U< -N O z L o Seventh Semester B.E. Degree Examination, June/Juty 2016 Experirnental $tress Analysis Time: 3 hrs. Max. l{arks:l0O Note: Answer FIYE fwlt qaestions, selecting st least TWO qaestions lronn each part" EaB.T -,4 1 a. Define gauge factor and derive the equation to deterrnlne the gauge factor for an eleetrical resistance strain gauge. {ls Marks} b. Derive the governing equation of potentinmeter used for strain measurement. (trS Marks) 2 a. A two element rectangular rosette is used to cletermine the two principal stresses at a point if E1 : 860prm/m and E, : -390pn/m taking E : 2A7 GPa ancl Foisson's ratio as 0.3. Find or and oz. (85 Marks) b. A delta strain rosette bonded on to the surface of a structural niernber yields the foliowing strain when the structure is loaded E6 : +500pnVm, 8126 : -250 prnim and Ez+o: +250 prm/rn. Given K : -0.07 and Vo : 0.285. Deterrnine the magnitude arrd directions of principal strains and stresses as the point when the strain rosette is bonded. Take E : 80GPa and Poisson's ratio as 0.3 for the structural member. 3 a. Derive the stress optic law, as applied to two dimensional photoelasticity. b. Explain the calibration technique used for photoelastic circular disc under compression. 4 a. List the irnportant properties of an ideal photoelastic material. b. Determine the individual values of or and 62 using sheor difference rnethod" PART _ts- 5 a. Explain with neat sketctr, the concept of,stress- freezing method. b. With the help of neat diagrarn, explain the scattered light polariscope. 6 a. Discuss briefly, Birefiingence coating stresses and explain the isochrornatic and isoclinic fringe patterns in a tsirefringence coating. (trS Marks) b, Explain the effect of Poisson's ratio rnismatch. (05 Marks) USN I 4,. h 8a. b. (15 h{arks} (trS Marks) diametrical (10 Marks) {10 Marks) (tr8 Marks) (1CI Marks) il0 h{arks) List and explain types of Brittie coatings. Discuss briefly the advantages and applications of Brittle coating. Explain Moir6's method f,or out of plane dispiacement measurement. (10 Manks) (n0 N4arl*s) (10 Marks) Discuss briefly the advantages and applications of Moird metliod of strain Analysrs. (tr0 Marks) **r,<rr*
- 6. 1OME72USN Seventh Semester B.E. Degree Examination, June/Juty 2016 Mechanical Vibration .":] Max. Marks:TOO 0) E (d r, 0) d i) 39 J- d9 =rnoo ll coo.ia .= Cal 6sf, o5I -OE! o") ;x oaJ botr -o>! ra5 Ed i(J '-^ t9 srE3t) !o 6.Y >'h oo"troo o= o- :l! o U< -l oi o o z p. E Time: 3 hrs. la. b. c. Note: Answer FIVE full qaestioms, selecting at least TWO questions from each pavt" PART _ A Define the following terms : (i) Periodic motion (ii) Degree of flreedom (iii) R.esonance (iv) Fhase difference. Add the following motion analytically and check the solutions graphically. (04 Marks) ilil::ilil".r'.l,hi; -ff:iJil;#i rb*owing Fig er(c) by harrnonic series (08 Marks) Deter..rqine the natural frequency of spring mass systerar taking the mass of the spring into account. {10 Marks) Set up differential equation for a spring mass damper system and obtain the complete solution for the under damped condition. (08 Marks) Derive the equation of motion for the system shown in Fig. Q3(b). If m: 1.5kg, K:4900N1m, a:6crn, b: l4cm, determine the value of ooC" for which the system is critically damped. (86 Marks) Fig. Q3(b) Rod is stiff and of negligible mass (08 Marks) 2 a. Find out the natural frequency of the system shown in Fig. Q2 (a) by using (i) Newton's method (ii) Energy method. (trO Marks) Fig. Q2(a) b. 3a. 'b. Fig. Q1(c) I of3
- 7. . 10iM872 In a spring mass system, the mass of 10kg rnakes 40 oscillations ln 20 seconds without damper. Wilh damper, the amplitude decreases to 0.20 of the original value after 5 oscillations. Find out (i) stiffness of the spring (ii) Logarithmic decrement (iii) Damping factor (iv) Actual damping coefficient. 106 Marks) Define the term "Transmissibility", and derive the expression for transmissibility ratio due li h1:il#'"iir??li?J; is acted upon by an external force 2450N at a frequener;#l#ill? To reduce the effects of vibration, isolator of rubber having a static deflection of 2mm under the machine load and an estirnated darnping factor of 0.2 are used. Determine: i) Force transmitted to the foundation ir) Amplitude of vibration of the machine iii) Phase lag of the transmitted force with respect to the external force. PART _ B Discuss the principtre of operation oEli6Giiter and an accelerometer. Draw the relevanr frequency response curve (10 Marks) 4a. b. 5a. b. 6a. b. A shaft 1.5rn long is supported in flexible bearing at the ends carries a wheel of 50kg mass at a distance 0.375rn from the left hand side bearing. The shaft is holtrow of external diameter 75n',rm and intemal diameter 40mm. the density of the shaft material is 7.7 Mg/m3 and its modulus of elasticity is 200GN/m2. Find the whirling speed of shaft, taking into (12 Marks) (10 Marks) absorber with (10 Marks) Also draw the mode shapes (tr0 Marks) account the mass of the shafc. what is dynamic vibration absorber? Expiain briefly the dynamic vibration diagrarn and equations. Find the natural ftequencies of the system shown in Fig. e6(b). and locate the node. Fis. Q6(b) 2 af3
- 8. t-t v w I ^ e t t CUSN Seventh Semester B.E. Degree Operations Time: 3 hrs" Research 10M874 Max. Marks:100 b. b. ci o o ! cd E cd 0) o t9 d9 5 oo t: co .s& VO -O o2 o: o() boi(!cO P6 -? .i'-^ iio tr o. tro. o: 6 _9. o= AE 6tr ^.= ^^oa- oo tr> YL U< -:6i o o z ]r, o A cargo compartr Note: Answer any FIVE full questions, selecting atleast TWO questions.from eack part. PART _ A plane has 3 compartments for storing cargo: front, centre and rear. These nts have the followine limits on both wei ht and Furthermore, the proportion of that weight of the cargo in the respective compartrnents must be the sarne compartment's weight capacity to maintain the lbalance of the plane. The (12 Marks) la. following four ca are avarlable tor sh on the next tlisht: Carso Weisht (Tonnes) Volume (Cubic meters) Profit (fiTonne) Cr IB 480 310 Cz 15 65CI 380 Cr /.J 580 35f) L.4 t2 390 285 Any proportion of these cargoes can be accepted. The objective is to determine how much of each cargo Cr , Cz , C3 and C+ shouid be accepted and how to distribute each amcng the compartments so that the total profit for the flight is maximized. Formulate the above problern as a linear program. Solve the following problem using graphical method. Maximize Z:2xr * 3xz Subject to 2x1 + xz < 6 . X1 -xz> 3 X1,X2)Q $olve the following linear programming problem using simplex method. Maximize Z: 6000xr + 4000x2 Subject to 4x1 + 3xz < 350 2x1* xz < 160 2xt*3xz<300 X1,x2)0 Solve by dual simplex method the following problem. Minimize Z = 2x1* 2xzt 4xt Subiect to 2x1 * 3x2 * 5xr > 2 3x1 +1r+74<3 *4xzf6x3<5 Xl,X2,X:)0 (10 Nlarksi (10 Marks) TIIE ve [rg ilIlllts ()II w€ ce. Compartment Weieht capacity (in Tonnes) Space capacitv (in cubic meters) Front t0 6800 Centre to 8700 Rear 8 5300 I of3 (08 Marks)
- 9. 1oME,74 3 a. ,4. product is produced by four factories A, B, C & D. The unit production counts in them are A - 50 units; E - 70 units; C - 30 units and D - 50 units. These factories supply the product to four stores, demands of which arc25,35, i05 and 20 units respectively. Unit transport cost in Rupees from each factory to each store is given below. 1234 A DD I D Determine the extent of deliveries &om each factory to each of the stores so that the total production and transportation cost is minimune. (12 Marks) Four new machines Mi, Mz, M: & Ma are to be installed in a machine shop. There are five vacant places A, B, C, D & E. Because of limited place, machine M2 cannot be placed at C and M3 cannot be placed at A. C; , the assignment cost of mactiine i to place j in <ioilars is shown'elow A B c I) E Mr Mz M,r M+ Find the optimun'l assignment scheduie. Solve the foilowing using Gomory's cutting plane algorithm. V{axirnize Z:20000xr + 30000x2 Sub.jectto 2x1*x2<6 i xr+2x2<8; x1 -x2<l ; )11 , K2 ) 0 and are integers" (08 Marks) xt</ (20 Marks) PART _ B 5 a. A project schedule has the follo characteric wmg cnaracterffitlcs: Activitrr Time (Weeks) Activity Time (Weeks) I' A, 5-6 4 ta I --1 I <-7 8 A L -.-* 1 5-8 1 2.A 1 1AI -U 2 1F J-J 5 8-i0 5 4-9 5 9- 10 7 i) Construct the network and compute E & L f,or each event" iil Find the critical path and project duration. b. 6a. b" What are the characteristics of a project? Also define the FERT and crashing cost. Define five operating characteristics of a queueing system. (12 Marks) (08 Marks) (10 Marks) A self-service store enrploys one cashier at its counter. Nine custorners arrive on an average every 5 minutes while the cashier can serve i0 customers"in 5 minutes. Assurning Poisson distribution for an-ival rate and exponential distribution ttrr service time, find D Average no. of custorners in the systern. ii) Average no. of customers in the queue. iii) Average tirne a custoffier spends in the system. iv) Average time a customer waits before being served. 2 4 6 l1 t0 8 "1 5 t3 J o t2 4 6 8 a J 4 6 l0 5 6 7 4 5 4 6 9 6 2 9 3 1 ) a J 2 of 3 (10 Marks)
- 10. ':."--4' 1 a. Reduce the following garne by dominance and find the gam#te.a[ue-t-' ' Player B 1234 10M874 (10 Marks) (10 Marks) 1 /1 Plaver A L .; J 4 b. Solve the following game by the graphical method. Player B 1234 Player 1 A2 8 a. Six jobs A, B, C, Assuming that no qi D, E & F have ar"rived at one time to be processed on a single machine. w.jobs arrive thereafter, determine Job A tsi C D E F Processing Time (in minutes) 7 6 8 4 J 5 i) Optimal sequence as per SPT rule ii) Cornpletion time of the jobs iii) Mean flow time iv) Avg. in process inventory. b. There are seven jobs, each ofwhi.h has to go through the Processing times in hours are gi Determine a sequence of these jobs that will idle time for bbth the machines. (08 Marks) rnachines A & B in the order AB. minimize the total elapsed time. Also find the (12 N{arks) t J 2 4 0 a J 4 2 4 4 2 4 0 0 4 0 8 J a J 4 0 5 4 J 7 are glven as .Iotr 2 J 4 5 A 7 Machine A J 12 15 6 t0 ll 9 Machine B 8 10 t0 6 t2 I ., 3 of3

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