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6th Semester Mechanical Engineering (June-2016) Question Papers



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6th Semester Mechanical Engineering (June-2016) Question Papers

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6th Semester Mechanical Engineering (June-2016) Question Papers

  1. 1. i $'* !46 USN lSrif E6r Sixth Semester B"E. f)egree Exanmination, June/Jmly 2&n6, Gomputen Imtegnated Manufactur$mg Time: 3 hrs. Max. Marks:i00 f{ote: Answer sny FXYE full questiorusu selectircg stlesst TWO qwestionr.yr"*rra esch part" PAR[. . A a. What are the different resSorls iLr industrial auiomation? F{orv .}r: you classify automated manufacturing systems? List typical fbatures of them. (12 Marks) b. A part is produced in a batch size of 100 units. 5 operations are required to cornplete the processing of the part. Average setup time is 3 hours/operation, avera.ge operation tirne is 0.1 hour. Delay, inspection time & others account to 7 lrours for each operation. Determine how many days are requirecl to compleie the batch, assurn:ing the plant runs 8 hours shirt ner 0) o () t< (B a C) c) {e se *=o il .5 or c3$ H(.) c)=F0) .r. q.c6 0()O lxL o>e 3 o,t 5lr(r- c-L ,') ; 5ucn tE L, d) 6.Y -^o = CJJ '* dJ 6E() t< _ c.t i) z L i< a. day. c. Define MLT. utilization and availabilitv. What are the fbctors aff-ecting fine balancing? Write a short note on the follor,ving : i) Precedence constraints & precedence diagrarn ii) Line efficiency The demand of the assembly line r,vith its elemental time and Construct the precedence diagram and flnd balance delay method. (Cycle time : 1.5 minute) With a neat sketch, explain the confrguration of an automated flolr, line. What are the different symbols and notations practiced in production systems? (08 &{arks) Explain with neat diagram the working principle of rvalking beam system. (08 l4arks) What are the ditferent controlling functions of ar1 automateC flow line? Explain. (04 Marks) Explain the foilowing : i) Upper bound approach and lcwer tlouricl appr<lach ii) Starting and Blocking of siatior-rs {08 FEarks} b. A line has 10 workstations, eacir urith a probabilitl, of breakdown 0.02. The cycle time of line is 60 seconds and each tilne br:eardoivn cccurs" it takes 5 minutes to repair. The line is divided into two stages by a buffer storage. Each stage) consists of 5 stetiorrs. Cotnpuie efficiency of the line with no buffler siorage capacity and efficiency for trvo stage flow lines. (10 Nfrarks) (02 Marks) iii) Baiance delay. (08 &{arks} i$5 &farks) (03 h,fanks) precedence is as given below. by Kilhridge and Wester's (X2 &'trar}+s) b. c. U. a" b. Eiements T'ime (Minutcs) Immediate Predecesscr I ) 0.5 1 _1 0.8 1,2 4 0.3 2 5 11L .,/- -t J (, 't-).2 3,4 '7 I ,l ti ) -=3, b., I i
  2. 2. PAfiTT - B a. With neat sketch, explain part feeding and delivery systems. b. Briefly explain ciiffbrent types of vehicle guiding systems used fbr AGVs. a. With a neat ctriagram, expiain generative and retrieval CAPP systems. b. Define MRP process inputs and outputs. What do you mean by BOM? a. Give general configuration of a CNC system. I-ist various advantages and CNC machirring centers. b. Discuss various types of NC co-ordinate systems along wlth motion control c. Describe the following codes: i) Gco ii) Gqo iii) Goz iv) Go+ roMsor (10 Marks) (10 Marks) (12 Marks) (08 Marks) disadvantages of (08 Marks) systems. (10 Marks) (02 Marks) a. Define indusfrial Robot. Enlist the dift'erent applications of Robot. (06 Marks) b. How do you specify a rcbot'? (04 Marks) c. Explain with neat sketches different types of end-et'fectors, sellsors used in robot. (10 Marks) ,,.**:t* 2 of 2
  3. 3. USN l0ME64 Sixth Semester B.E. 2016 Finite Time: 3 hrs. Max. Marks: ltlO Note: l. Answer FIVE.full questions, selecting at lesst TWO questions from each purt. 2. Missing data may suitably be assumed. PART _ A a. Derive the equilibrium equations of a three dimensional body subjected to a body force. -l- el ol 5le{l 1 -L b. C) () (J Lr a. (t E a 63 oP (! 6) tr 3Pco# !- !B d(J 7tn -r, ll coo ,= c(o$ gil (.) =-.c (.) oB fre Ad (nx YC'(ll() clt O =ooc .E cU o tsE ss= !d -bts 5v-9= c- 5- trc- (.)i ?.Y 6: 9(.)(,t= r6 3E ooo o= :i- I =o)() U< - c...1 0) o z c'3 P E b. Explain the general description (steps) of FEN4. c. Briefly expiain the types of elements based on geometry. 2 a. State principle of virtual work and principle of minimum potential energy. b. Calculate an expression for deflection in a simply supported beam under distributed load P,, ever entire span of length L using Rayleigh Ritz method. c. What are the steps involved in Galerkin's method to find out <leflectir-rn? a. Explain two dimensional Pascal's triangle. b. Define irrterpolation polynomial, sirnpler, compir:x and rnultiplex elenreiits element. c. Find the shape functions of a CST element and plot the same. ({}8 Nlarks) (05 Marks) (06 V{artr<s) (04 Marks) uniformly (10 Manks) (06 Marks) (C5 Marks) aad cubic (05 Marks) (10 h{arks) a. pig Q1(a) shows a thin plate of uniform thickness of I mln, weight density - 76.6x10-6 N/mm3 and subiected to point load of 1kN at its midpoint. Take E : 200 GPa. Evaluate nodal displacement, stresses, and reactions. Using elimination techniques. (10 Marks) Fig Qa(a) Find the nodal displacement, stresses and reactions of a Fig. e4(b). method. *9-4tnm,* Af,= 36Dmv* 2rtD Li Es -2oa Qfr,t 1-1o Q fo Using penalty approach (10 N{arks) I I ,"$* Fig Qa(b) 1 n.€')
  4. 4. PART _ ts a. Obtain the shape functions of quadratic bar element. b. Use two point Gauss quadrature to evaluaie the integral I = 3 Irr'0 10ME64 (10 Marks) . (10 Marks) (10 Marks) concentrated load as a. Derive an expression b. Determine the nodal shown in Fig Q6 (b). - q)dq for stiffness matrix of a 2 noded truss element. displacements in the truss segments subjected to TakeE:70GPaA:0.01 m2. (10 Marks) l T lo [oD N a. Obtain Hermite shape functions of a beam element. (10 Marks) b. Find the deflection at the tip and the support reaction of a cantilever shown in Fig. 7(b). F : 250kN E, : 2OCGPa E : 4x 106 mma k-*- o,Bro Fig. Q7(b) (10 Marks) a. Obtain the governing equation of a one dimension heat conduction. (10 Marks) b. Calculate the temperature distribution in a one dimensional fin with the physical properties shown in Fig 8(b). There is a uniform generation of heat inside the wall of Q = 400Wm3. K:.Oo'oNlnn'C, 6 = +Oo Nlr,o$ Yco.CIl?n Fig. Q8(b) {<*r,<*{< 2 af 2 l.k- 4n -*4 Fig Q6(b) (10 Marks)
  5. 5. USN Sixth Semester B.E. Desisrr G'f Tirne: 3 hrs. 1E&q862 2016 Max. Vtrarks: i00 a. 0.) () ,J L< d E a (g () ! 8Rw 6= Q,t- .:4 ? CB I, 7t, .= c df gc) (l)tr la d) Ee a(ts o '1) b0d =L !v) .c(d i6'8s aa dEFc- CV 0(); a"J S()<atI tr 6) =fi @o do0 :.= udj =6) U< _ c.t c) o z ti o c. E Note: l" Answer $ny FIVErtril qwestiows, selecting o$leewt TWO questiorus frorn esch Bart. 2" {-tse of Desigra hawl book is permtitted. 3. Missing data, is anlt ntey be switabl_v, ssswm€d" PART -- A Determine the dimerisions of the r:ur.red bar siror^;n and FOS : 3.5. ir"r Fig.Q1(a). Assurne oyt : 400 N,{N/m2 (I0 &{arks) {.1S ir'$*rks} (S7 ft{arks} b. Write a note on Walrl stress correcticrn factor. (03 Marks) c. A semi-elliptical leaf spring has a span of 1.8 m. The spring carries a helical spring upoil which is imposed an impact of 3 kN-m. The laminated spring has 8 graduated and 3 full length leaves each 60 mm wide and 6 rnm thick. The coil spring has 9 coil of 12.5 rnm',ryire diameter and a spi'ing index of 7 . Find the stresses induce<tr in each spring. Take G:80x103 MPa, E: 2A6xl03 Mpa" F ig.Q i (a) b. A circular piate nrade of steei arid of diameter 200 mm with thickness l0 rnm is subjected to a load inducing a pressure of 4 MN/m2. laking E : 2Al kN/nrrn2, Poisson's ratio 0.3, determine (i) Maximurn stress, its location and maximurn deflection when the edges of the plate are supported. (ii) Maxinrr,rn stress, its location and rnaximum deflection when the edges of the plate is fixed. (trti ft,Xarksi a. A flat belt 200 mm wide weighing 20 N/rn connecting a 300 mm diarneter pulley to a 900 mm diameter driven pulley at a shaflt spacing of 5 rn, transmits 55.2 kW at a belt speed of 25 m/sec (i) Calculate ihe belt length an<i tire a angles of wrap (ii) Compute the beit tensions based in a coefficient of fiiction 0.3tt. (10 h'{arks) b. A V-belt drive is requirerj to transr,it 15 kW at 210 mm sheave running at 75* rpm ta another pulley to run at 375 rpm. The belt usecl is 30 rnm wide at top, 2{ mm thick with V-angle 40o. The allowable stress for belt material is 2 MPa. Centre distance is L.2 m. Specific weight of belt material is tr.1 gmicc. CoeiEcient of friction of srnaller pulley is 0"3 and for large pulley is 0.25. Find the number cfl bnelts of given cross-section required for this application. a. Derive an expression for the stress induced in a helical spring r,vith usual notations. {1S &!arks)
  6. 6. b. 10M862 a. State any four advantages of geffi Crive over uther types of drives. (04 Marks) b. A pair of spur gears ivith 20'fuil depth involute teeth consists of a20 teeth pinion meshing with a 4l teeth gear. The mociule is 3 mm i.vhile the face width is 40 mm. The material for the pinion as weil as the gear is steel with an ultimate tensile strength of 600 MN tnf . ttte gears are heat treated to a surface hardness of 400 BHN. The pinion rotates at 140 rpm and the service factor for the appiication is 1.75. Assume that the velocity factor accounts for the dynarnic load and the factor of safety is 1.5. Determine the rated power that the gears can transmit. (16 Marks) PAR'['_ B a. A two teeth right hand worm transmits 2 kW at 1500 rpm to a36 teeth wheel. Tho module is 5 mm and pitch diameter of worn:l is 60 rnrn. The pressure angle is 14.5". The co-efficient of friction is found to be 0.06. Find : i) The centre distance, iead and lead angie ii) The efticiency of the drive ,tD T;ffffi A pair of"bevel gear rvheels with 20" pres-qure angle consists of 20 teeth pinion meshing with 30 teeth gear. The mcduie is 4 mm whiie the face width is 20 mm. Surface hardness for 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 3A% greater than the mean torque, Determine the safe power that can be transmitted. Considering dynamic load. wear strength and bending strength. The ailowable bending stress may be taken as240 MPa. (l0Marks) Determine the dimensions of a simple cone clutch to transmit 20 kW at 1000 rpm. The minimum diameter is to be 300 mm and the cone angle 20o. Assume p - A.2 and permissible pressure : 0. tr MN/m2" Also deterrnine the axtal force required to engage the chtCh. (10 Marks) A differentiai band brake as shown in Fig.Q6(b), has an angle of contact of 225o . The band has a compressed woven lining and bears against a cast iron drum of 350 mm diameter. The brake is to sustain a torque of 350 N-rn and the coefficient of friction between the band and the drum is 0.3. Find (i) the necessary fbrce P for the clockwise and anticlockwise rotation of ttre drurn. (ii) The value of 'L)A' for the brake to be self iocking when the drum rotates ciockwise. (10 Marks) Fig Q6(b) a. Derive Petroff s equation for coefficient of fiiction for h,v-drodynamic bearing. (08 Marks) b. The thrust of a propeltrer shaft in a ship engine is taken by a number of collars integral with the shaft which is 300 mm diameter. The thrust on the shaft is 200 kN and speed is 75 rpm. Bearing pressure is 0.3 MN/m2. Find (i) the number of collar required if the outside diameter is 500 mm. (ii) Power lost in friction assuming uniform wear (iii) Heat generated in the a. b. bearing. Design a connecting rod for a peirol engine fi^om the Cylinder bore or diameter of piston: 100 mm. Maxirnum gas pressure - 3 N/mm2 Engine speed : 1500 rpftx Compressionratio:4:1 Compression rori is made of steel and assume the design. (12 Marks) following data: Length of connecting rod - 350 mm Length of stroke : 150 mm Weight of reciprocating parts : 25 N 'l' section. Assume any further data required for (20 Marks) ,F>F**r<
  7. 7. USN 10ME63 Sixth Semester B.E. flegree Examination, June/July 2Dffi Heat and Mass Transf,er Time: 3 hrs. Max. Marks:100 Note: l. Answer FIVE full questions, selecting at least TWO questions.from euch part. 2. Use oJ'heat transfer dats hsnd book ond stesrn tables are permitted. PAR.T _,d a. What do you mean by boundary condition of I", 2'o and 3'd kind? (06 Marks) b. Derive the general three dimensional heat conduction equation in cartesian co-ordinates and state the assumptions made. (08 l{arks) c. A pipe with outside diameter 20 mm is covered with two insulating materials. The thickness of each insulating layer is l0 rnm. The conductivity of I" insulating layer is 6 times that of the 2"d insulating layer. [nitially insulating layer is placed in the ordeiof 1't and 2"d layer. Then it is placed in the order of 2"'r layer and 1*t layer. Calculate percentage change in heat transfer and increase or decrease. Assume a length of I m. In both the arrangement, there is no change in temperature. (06 Marks) a. What is physical significance of critical thickness of insulation? Derive an expression for critical thickness of insulation for a cylinder. (06 N'Iarks) b. Derive an expression for the temperature distribution for a pinfin, when the tip of the fin is insulated. (08 Marks) c. Find the amount of heat transferred through an iron fin of thickness of 5 mm, height 50 mm and width 100 crn. Also determilre the temperature difference at the tip of the fin assuming atmospheric temperature of 2B'C and base temperature of fin : 108'C. Assume the follor,ving K: 50 WlmK, h : 10 W/m2K. (06 Marks) a. Write a note on Biot number and Fourier number. (04 Marks) b. Obtain an expression for instantaneous heat transfer and total heat transfer for lumped heat analysis treatment of heat conduction problem. (08 Nlarks) c. A hot rnild steel sphere (K: 43 WlmK) having l0 mm diameter is planned to be cooled by an air flow at 25o. The convection heat transfer coefficient is 1 15 Wm'K. Calculate the following (i) time required to cool the sphere from 600'C to 100'C (ii) Instantaneous heat transfer rate I .5 min after the start of cooling (iii) total energy transferred from the sphere () .9 o L C! cd E o 0) clj () Lr .9 (Jx bo* s= -VF 6J s, 5tr) co ll .= a.i (€$ 9il C)= €g oB EZ a= o() clO o0c .E cd C >??(g tr=-O cd -2" f 6E aa o. F- tro. o!v '!) i f, .= 6* A(.,(,L= 3- 0) 3= coo tbo ()= ::- !.l =6J tr(J U< dC{ 0) I z (€ F o. during the first 1.5 min. a. Explain the following: (i) Velocity boundary layer b. Using dimensional analysis derive an expression Grashoff numbers for natural convection. (08 Marks) (ii) T'hermal boundary layer. (06 Marks) relating Nusselt number, Prandtl and (08 l{arks} The plate is 2 m long and I m edge of the plate and the total (06 Marks) c. Air at 20"C flows over thin plate with a velocity of 3 m/sec. wide. Estimate the boundary layer thickness at the trailing drag force experienced by the plate. . - l'l Q 11o;{:: L of 2
  8. 8. 1OME63 PAITT_ B a. Explain the physical significance of the following dimensionless numbers: (i) Reynolds number (ii) Prandtl number (iii) Nusselt number (iv) Stanton number. (08 Marks) Ir. Air at 20"C flows past a 800 mm long plate at velocity of 45 m/sec. If the surface of the plate is maintained at 300oC. Determine (i) The heat transferred from the entire plate length to air taking into consideration both laminar and turbulent portion of the boundary layer. (ii) The percentage error if the boundary layer is assumed to be of turbulent nature from the very leading edge of the plate. Assume unit rvidth of the plate and critical Reynold's number tobe 5x105 (12 Marks) a. Derive an expression for LMTD fbr counter flow heat exchanger and state the assumptions rnade. (10 Marks) b. A counter flow, concentric tube heat exchanger used to cool the lubricating oil for a large industrial gas turbine engine. The flov.z rate of cooling water through the inner tube. (di : 20 mm) is 0. 18 kg/sec. While the flou,' rate of engine oil through the outer annulus (do:40 mm) is 0.12 kg/sec. The inlet and outlet ternperature of oil are 95oC and 65"C respectively. 'fhe water enters at 30'C to the exchanger. Neglecting tube wall thermai resistance, fouling factors and heat loss to the surroundings, calculate the length of the tube. (10 Marks) a. Clearly explain the regions of pool boiling with neat sketch. (06 Marks) b. State and explain Ficks law of diffusion. (06 Marks) c. Air free saturated steam at 85oC and pressure of 57.8 KPa condenses on the outer surface of 225 horlu.oritai tubes af 1.27 cnr outside diameter arranged in 15 x I 5 arcay. Tube surfaces are maintained at a uniform temperature of 7soc. Calculate the total condensation ratelm length of the tube bundle. (08 Marks) a. Expiain : (i) Stefan Boltzrnann law. (ii) Kirchoff-s law (iii) Plank's law (iv) Wein's displacernent larv. (v) Radiation shield. (10 Marks) b" Calculate the net radient heat exchange per m' area for two large parallel plates at temperatures of 427'C and 27"C. respectively. Take emissivity of the hot plate and cold ptrates are 0.9 and 0.16 respectively. If the polished aluminium shield is placed between them, find the percentage reduction in the heat transfer. Take emissivity of shield uirfi *i".ur, ***rl*
  9. 9. USN 10ME6s Sixth Semester B.E. f)egree Examination, June/July 2016 Mechatronics and Microprocessor Time: 3 hrs. Max. Marks: 100 Note: Answer FIVE full questions, selecting at least TWO questions from euch part. PART _ A a. What are the basic functions of control system? Mention the requirement of it in detail. (06 Marks) (06 Marks) the functions of each (08 Marks) q,) (.) () ! (:- o ad (.) C) ! frR Q;- ta E<> 7tn {t,e .= c d$ g tl., Cj)C .EC) oB 82 aX (-) q) ((l0 50tr .s6 >rn -(Efi3 -t 'rO 63 -.,6 5uu)- c.eFo. 0(); ?.Y, 6 : !. -a tE EE:i 6) ?c >',* ^^Ctro0 (J= =9 =c)() =ao< - c.l (l) z C, :- e b. What are the benefits of mechatronics in industries? c. Draw the structure of a programmable logic controller and mention block. a. A potentiometer resistance transducer has a total winding resistance of 8KO and a maximum displacement range of 5cm. The power dissipation at maximum displacement is not to exceed 50 mW. Determine the output voltage of the transducer when the input displacement is 2cm. b. what are position sensors? Explain the working of Hall advantages of it. (06 Marks) effect sensors and mention the (08 Marks) (06 Nlarks) break. Mention (06 N{arks) solenoids for an (06 Marks) (08 Marks) (06 Marks) (04 Marks) c. Explain the operation of a linear variable differential transducer. a. Draw the switching arrangement of break before make and make before disadvantages of mechanical switches. b. What are solenoids? What are the parameters to be consicler for selecting a application. c. What is stepper motor and explain the working of a two stack stepper motor. a. Explain the operation of a optical isolator. b. For the op-amp circuit shown in Fig.Q.4(b), find the output voltage. Fig.Q.a(b) c. Illustrate a dataacquisition system. (07 Marks) d' What are the advantages of digitot signal processing over analog signal processing? 1 0f 2 (03 Marks) L o k-rf
  10. 10. a. PART _ B Convert the following: i) (ABC)ro:(--_-)ro ii) (204.2)s:(-)ro iii) (0.60)ro:( -)z iv) (101010.101)2 : ( -)ro. Write a note on overflow and underflow. 10M865 (08 Marks) (06 Marks)b. Simplify the Boolean expression and realize .ising basic gates Y = A (^* + AeC). a. I)raw the block diagram of a control unit and explain it. b. Draw and explain the timing diagram of read operation. a. (06 Marks) Define the following terms with respect to microprocessor: r) Fetch cycle ii) Accumulator iii) Interrupts iv) Stack pointer v) Write cycle. (10 Marks) Draw the block diagram of a micro controller and mention the functions of each block. (10 Marks) Explain the different types of addressing modes of INTEL 8085 microprocessor with example. (10 Marks) Write a program to find the largest of N binary numbers that are stored at consecutive data memory locations starting at X. (07 Ntarks) What is the function of logical group of instructions anci mention few of it. (03 Marks) b. a. b. ri (10 Marks) (10 Marks) d<*{<*{< 2 of 2
  11. 11. USN l0Mii65s Sixth Semester B.E. Degree Examination, June/July 2016 Non-Traditional Machining Tirne: 3 hrs. Max. Marks:100 Note: Answer FIVE full questions, selecting at least TWO questions from each part. PART - A a. How modern machining processes are classified? (06 Marks) b. What is the difference between conventional and non conventional machining processes. What are the essential physical process parameters for an efficient use of moder, ff.XX1B process? (05 Marks) Why NTM processes are selected for manufacturing? (04 Marks) Explain with neat diagram construction"and working of USM processes. (10 Marks) Explain the following parametcrs *,ith respect to USM: i) Effect of amplitude and frequency of vibration. ii) Effect of grain diameter. iii) Effect of applied static load. (10 Marks)iv) Effect of slurry. a. Draw schematic diagram of Abrasive Jet Machining (AJM). Explain its construction and C' () (J li o. Cd a d 0) od () ! ER ii= -7= cd (J =(.)-oo ll (oc .g c(6t 0.) ::J 06.)= F0J 8? u)H bU do ot40tr .sd o>q?6 sE= !cd :)5', C) oEAa agtrE L)i fr-v d): E() atE E;!() O.= >'* ooo cb0 ()= =(t:Lg =d)o o{ -6t (l) o z d t- E c. d. a. b. working. b. List and explain the variables used in AJM. c. List the application of water Jet machining. a. Draw schematic sketch of electro chemical machining and ECM process. b. Explain with neat schematic diagram of electro chemical application. (06 Marks) (12 Marks) (02 Marks) explain briefly the elements of (10 Marks) grinding and their advantages and (10 Marks) (1G Marks) (10 Marks) with neat (08 Marks) PART _ B a. What are the factors on which the selection of a resist for all in chemical machining depend? (03 Marksi b' Explain the elements of process (i) Maskants or resist (ii) etchants in CHM. (08 N{arks) : Explain with sketch progressive stages of metal removal in chemical blanking. (06 Marks) d. List the applications of chemical machining. (03 Marks) a. Draw neat diagram of EDM (Electrical Discharge Machining). Explain its construction and working. b. Explain briefly EDM process characteristics. a. Explain the construction and working principle of Plasma Arc Machining (PAM) sketch. b. List the general guideline for designing the torch. (06 Marks) c. What are the application of PAM and also mention advantages and limitations? (0f Marks) a. With neat sketch, explain working principle of Electron Beam Machining (EBM). tos Marks) b. Draw neat sketch of a typical set up .for Laser Beam Machining (LBM) and explain briefly. c. What are the advantages and limitations of LBM? (08 Marks) (04 Marks) *****