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5th Semester Mechanical Engineering (June-2016) Question Papers

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- 1. { #"* USN Fifth Semester B.E. Degree Management and Time: 3 hrs. Note: Answer ony FIVE full questions, selecting atleast TWO questions .front each port. a. Discuss the steps commonly followed by orgarnzations in selection procedure. (10 Marks) b. Discuss the different sources of recruitment. (10 Marks) 5a. b. (.) .9I () Lr o. (! E a d o O li B9oo-(n= ;B cG !, =nJJ, oo ', cca .=&(g$ gil 6)tra0) Ee .^= O() (BO o0c v6 >: -cs(sl -1 €cd -2" ts gr= ,J) - c.5. tro. ()i 6): 3o(,IE aE!(J t=> (H boo cbo o= :r !., =o) lr< -cn C) o zI (B t- E PART _ A a. Define management, explain the levels of management. b. Define planning. Explain the types of plans with example. a. Explain in details any five functions of management. b. List and explain the characteristics of planning. a. What are the purposes of communications in an organization? b. Discuss all the steps involved in a control process. 10AI-,51 2016 Max. Marks:100 (10 N{arks) (10 Marks) (10 Marks) (10 Marks) (10 Manks) (10 Marks) PART _ B Define entrepreneur. Discuss four key elements in context to entrepreneurship. (06 Marks) Explain entrepreneurs based on the type of business. (08 Marks) Discuss three barriers in connection with entrepreneurship. (06 Marks) a. Discuss steps in the location of small scale industry. (10 Marks) b. Explain the impo rtant factors in the selection of a small scale industry site. (10 Marks) a. Discuss in detail on sources of finance for small scale industry. (10 Marks) b. Elaborate on objectives and functions of SIDBI. (10 Marks) a. Define project, discuss at least four criteria to select a project. (10 Marks) b. What are the needs of network techniques in project? Explain two types of network techniques in project implementation. (10 Marks) *****
- 2. USN Fifth Time: 3 hrs. 24rc Design of Machine Elements - I Max. Marks:100 Note: l. Answer FIVE full questions, selecting at least TWO qwestions frorm each purt" 2. Use of design duta hsndhook is permittecl. 3. Assume missing datu if any suitably. r0ME52 (06 Marks) (04 Marks) (10 Marks) () () oCd L< O. (g a(n 0.) P 0) ! ERoo* c-: .i -Y- (tr J =rr)-oo ll cco .= c(g$ gd 0Jg .r. aJ ots E2 aX oc) coO oog(€cC 'ob >r -(Ecg -t !d -z-. r 5tsar c.Etrc- ?.Y 6: tA lE Tt ao-tro0 oJ= =6Jh'" g X o.i, o U< * ('rl c.) z 63 tr PATTT _ A a. Explain the phase of Design with neat flow Diagram. b. What are the codes and standards? c. Stresses in a two dimensional stressed body as in the Fig Q1(c), Determine : i) Principal stresses and their direbtlon ii) Maximum shear stress and their planes. a. b. 6o MPa .4- go P1?q I?.0 M?q lLo MPrt =l,l 6b Jta Po- Bo fll?a Fig. Q l(c) What is the stress concentration factor? What are the methods to determine stress concentration factor? (06 Marks) A Load of 4000N on a simply supported shaft as in the Fig. Q2(b). Find the radius of the fillet at left side of the shaft, if maximum stress at left fillet is same as that of right. Take q - 0.95. (r4 Ntrarks) JL Fie. Q2(b) 0 4oo ,,rn. | 4oao v, {- N tJL * X ]d*i mrt T*- 0t; n* I of3
- 3. 10M852 a. List the factors effectrng the endurance limit. (06 Marks) b. Determine the Diameter "d" based on soderberg criterion for a machine member as shown in the Fig. Q3(b). The properties of the material used are, uitimate stress ou : 600MPa, yield stress oy : 400MPa, ettdurance stress se,, : 300MPa" and yielC shear stress ry :200MPa. The size factor, surface factor are 0.9 and 0.85 respectively. The notch sensitivity factor is 4"92. and load factor for axial can be as 0"6 and fhctor of safety as 3. (14 Marks) a. Explain the stresses in the screw b. A flangeci tsearing as in the Fig. 50N/mm'. Dete.*ine size of the due to the static loading. Q4tb) having allowable stresses in shear in Bolt. (10 Marks) Bolt material is (10 Marks) Fig. Qaftr) PART'_ B A commercial steel shaft with allowable shear stress 40MPa, with shock factors for Bending and twisting is tr.5 and 1 respec,trvely. The length of the shaft between bearings is 600mm carries a pulley of 400mrn diarneter having weight 400N, mounted in middle of the shaft. Shaft receives 40kW at 600rprn by a flat belt drive. Power from shaft is transmitted through another pulley of diameter 600rnni iveigiring 600N over hanging the right hand bearing by 200mm. The Belt drives on puileys are right angles to each other. Take ratios of Belt tensions as 3, determine the diarneter of the shaft. Use ASME code for shaft Design. (20 Marks) Fig. Q3 (b)
- 4. b. 10ME52 Two rods made up of plain carbon steel having. tensile stress oyt : 380 N/mm' are to be connected by means of cottar .joint. Diameter of each rod is 50mm and cotter is made up of steel of l5mm thickness. Calculate dimensions of the socket end, making following assumptions. i) Yield strength in compression is twice of tensile yield strength. ii) Yield strength in shear is 50% cf tensile yield strength. Take factor of safety as 6. (10 Marks) A 19kW,1440 rpm motor has a steel shaft, extension of the shaft is 75mm. Diameter of the shaft is 45 tnm. Maxirnutn torques is 3.5 tinres tire average torque and yield shear stress is 54MPa, crushing stress is lOBMPa for key materiai" Design the key and also determine effect of key way. Take factor of safety as 2.5. (I0 N{arks) Design a Triple Riveted Iap joint o{ zig-zag type for a pressure vessel of l.5m diameter. The maximum pressure inside the vessel is'1.SfuIPa. Allowable stresses in tension, crushing and shear are 100MPa, l25MPa and 75MPa respectively. (I0 Marks) b. A plate of 80mm wide and 15mm thick is to be joined with another plate by u single transverse weld and a double paraliel weld. Determine length of the parallel weld if joint is subjected to both static and fatigue loaciin-{. Take tensiXe stress o't : 90 hulPa, Shear stress t : 55 MPa as allowable stresses anci stress concentration f'actor as 1.5 for transverse weld and 2.7 fbr parallel weld. (10 Marks) a. Obtain the expression for Torque required to lift the ioad on a square threaded screw. (08 Marks) b. A square threaded power screw has nominal diarneter of 30mm and a pitch of 6mm with Double start. Load on screw is 6kl'J and mean diameter of thrust collar is 40mm. The co- efficient of friction for screw is 0.1 and for collar is 0.09. Deterinine a) torque required to rotate the screw against the load. b) Torque requirecl to rotate the screw with the load c) overall efficiency d) Is the screw seif locking? (tr2 Marks) a. *{<*** 3 of3
- 5. 6a. b. c. C) o () (d :i o. (c E a C) (! (.) ! EPoo* c.:5 .ya (€ lJ 5?bo rr coo .= c g# t d-) oB 8e aX C)a) 60 oo= arx >€ -0J €(B 5irAA o"6tro- 563 ?.= 6= 3()(,tE tCJ ==Xtoo-c b,l) ()= gCJ = o-) () tr< - c.t c) o z! ts o USN 10M853 Fifth Sernester B.E. Degree Examiil on, Jlrfir -.**.-.-"t." ., iel;Iuly ?,016 Emerglr Emglmeelind Time: 3 hrs. Max. Marks:100 Note: l. Amswer &nJ/ FIVE full questions, selecting atlesst TWO questions.from each part. 2. lJse of Steam tuble with Molier chart permitted. PART _ A a. Explain with a neat sketch, working of multretort stocker and their advantages. (10 Marks) b. Explain pneumatic or vacuum extraction ash handling system. (06 Marks) c. What are the advantages of liquid fuels used in thermal power plants? (04 Marks) 2 a. With a neat sketch, explain the r,vorking of Schmidt - Hartman Boiler. b. What are the different types of cooling ponds and cooling towers? c. Explain the comparisons between forced and induced draughts" a. Classify the fuel storage and supply systems used in a diesel power plant. (08 Marks) b. With a neat diagram, explain the working of a diesel power piant. (08 Marks) c. What are the outstanding features of a diesel power plant over thermal power plant? (04 Marks) 4 a. Explain water hammer and surge tanks. What are the different types of surge tanks? Brief with neat sketches. (08 Marks) b. Define the term Hydrograph and Unit Hydrographs. (06 Marks) c. A catchment area ofthe dam used for hydroelectric station is 250 km2. The annual rainfall is l25cm. lf '70o/o of water is used for power generation in the dam, calculate the capacity of power plant in MW. Assume that the turbine efficiency is 90% and generator efficiency is 95%. Neglect the losses. (CI8 Ntarks) (08 Marks) (04 Marks) (06 Manks) write the advantages (08 Marks) (08 Marks) (04 Marks) (08 Marks) (04 Marks) PART'_ B a. With a neat sketch, explain the working of a fast breader reactor and and disadvantages. b. What are the general components of nuclear reactor? c. Explain the terms Nuclear Fusion anC Nuclear Fission reaction. What is Flat Plate Collector? Write a brief description of l,iquid collector. (08 Marks) Write with a neat sketch, the working of aHorrzontal axial machines. (08 Nlarks) Derive an expression for overall conversion efficiency and coetficient of perfbrmance in terms of velocity of blade element. (04 Marks) &, What are the components of a tidal power plant? Brief each. (08 Marks) b. A hot water geothermal plant of the total flo* type receives water at 2250C. The pressure at the turbine inlet is 10.5 kglcm2. The plant uses a direct contact condenser that operates at 0.35 kg/cm2. The turbine has a polyrcphic efficiency of 0.65 fbr a cycle net -output cf 10MW. Calculate by using stream table and Molier chart" (i) The hot water flow in kg/hr. (ii) The condenser cooling water flow in kg/hr at water temperature at 27"C. (iii) The cycle efficiency. (iv) The plant heat rate. c. Write the advantages and disadvantages of tidal power generation. a. Explain photosynthesis with example. (08 Marks) b. With aneat diagram, explain the working of continuous and batch type Biogas plants. (08 Marks) (04 Marks)c. Write the classification of Biomass gasifiers.
- 6. USN 10ME54 2016 iii) Member with two forces (09 Marks) work, conSidering a slider crank (11 Marks) ii) Co-efficient of (06 Marks) Fifth Semester B.E. Degree 0) (.) o63 L{ o. d a d o (l) t< 8ebo* ,.-y- (d(J =ta co ll troo .E c cd$ xbotso <utre'1 C) oB E2 aX (J)(.) csO o.ooog(€ 63 arx>e.(t so= !co -2" ts 5ua_ o" 6_ tro. (); a9 0)= 5(J cn l.= :r() >,: bo- c' oo or5 = -o) XG) o U< <N o) o zP F o a. L ii) Three force members the principle of virtual a. Discuss the following terms : i) Turning moment diagram fluctuation of energy iii) Co-efficient of fluctuation of speed. b. The turning moment diagram for an engine consists of 2 Isosceles triangles. Maximum height of each triangle represents turning moment 1000Nm. The base of each triangle - n radians. If the engine runs 200 rpm and total fluctuation of speed is not to excee d 3% find : i) Power of the engine. ii) Mass of rim type fly wheel concentrated al 0.25m, radius neglecting the effect of arms and boss. (14 Marks) a. Derive an expression of total tictional torque for a Flat collar bearing subjected to uniform pressure. (08 Marks) b. A belt which is embracing 1650 of a pulley of effective diameter l000mm is transmitting 10kW. The pulley is running at 250 rpm. The coefficient of friction is 0.3. Mass of belt material is 0.00l2gmlmm', Thickness of belt - 10mm. Considering centrifugal tension, find width of belt. Safe working stress is 1.5MPa. Also determine the Initial tension in the belt drive. (12 Marks) a. What do you mean by static balancing and dynamic balancing? (04 Marks) b. Arotating shaftcarries fourradialmasses A:Skg, B, C:6kg, D:5kg. The mass centres are 3'0, 40, 40 and 5Omm respectively from the axis of shaft. The axial distance between the planes of rotation of A and B is 400mm and between B and C is 500mm. The masses A and B and D from mass A ii) the axial distance between the planes of rotation of C and D and iii) the magnitude of mass B. (16 Marks) PART _ B The cranks and connecting rod of a 4 cylinder in line engine running at 1800 rpm are 50mm, 250mm each respectively and the evlinders are spaced 150mm apart. If the cylinders are numbered 1 to 4 in sequence from one end and the cranks appear at intervals of 900 in an end view in the order l-4-2-3. The recipro'cating mass corresponding to each cylinder is 1.5kg. Determine i) Unbalanced prim ary and secondary forces if any ii) Unbalanced prim ary and Dynamics of Machines Time: 3 hrs. Max. Marks:100 Note: Answer any FIVE full questions, selecting atleast TWO questions from each port. PART _ A a. Discuss the equilibrium of the following systems : i) Two force members and a torque. b. With usual notations, explain mechanism. secondary couples with reference to central plane of engine. (20 Marks)
- 7. 6a. b. Explain the terms Sensitiveness , Stability , E,ffort and Power of a governor. toMns+ (08 Marks) The length of upper arm and lower arms of a porter governor are 200mm and 250mm respectively. Boththe arms arepivotedto the axis of rotation. The centralload is 150N, the weight of each ball is 20N and the friction of the sleeve together with the resistance of the operating gear is equivalent to a force of 30N at the sleeve. If the limiting inclinations ofthe upper arm to the vertical are 300 and 400, determine the range of speed of the governor. (12 Marks) a. Derive an expression for the gyroscopic couple. (05 Marks) b. The motor of a marine having a mass of 1000 kg and radius of gyration 300mm rotates at 1550 rpm clockwise when looking from the bow. Determine the gyroscopic couple and its effect on the ship in the following cases : D When the ship pitches with an angular velocity of 1 radlsec when the bow a) Rising b) Falling. ii) When the ship is speeding at 40km/'hr and takes a right turn in a circular path of 200m radius. iii) When the ship rolls at certain instant, it has an angular velocity 0.5 radlsec when viewed from the stern. (15 Marks) The following data relate to a symmetricai circular cam operating on a flat faced follower. Least radius :25mm, Nose radius:8mm, Lift of thc valve: 1Omm , Angle of action of cam: 1200 Cam shift speed : 1000 rpm. Determine i) Flank radius ii) Maxirnum velocity iii) Maximum acceleration iv) maximum retardation. If the mass of the follower and valve with which it is in contact is 4 kg , find the minimum force exertedbythe spring to overcome the inertia of the moving parts. (2}Marks) *?k*** 2 of 2
- 8. l0ME55USN 5a. b. c. C) o o li o. 63 E a 6 (u C) 3r Egoo* J- (c? =(nin tt coo .3 e.r d<f, 6?p o=11 0) E= 0e a;I oo) do aoi Eb >r -(tt tr= !(a 5 o.r 'Eo oeAr 48.tro. bEa (.) atE i(J 3= "noa50 u= 9r g) =G) L() (.r< - c.l (u o z (€ Li o c. Fifth Semester B.E. Degree Examination, June/July 2016 Manufacturing Process - III Time: 3 hrs. Max. Marks:100 Note: Answer FIVE.full questions, selecting at least TWO questions from each part. PART _ A a. Give the broad classification of metal working processes. (04 Marks) (08 Marks)b. Explain Tresca and Von-Mises yield criteria. c. The state of stress at a point is given by, o * =70 MPa, o, = 120 MPu, 'Exy = 35 MPa. lf the yield strength of the material is 125 MPa, determine in a uniaxial tensile test, whether yielding will occur according to Tresca's and Von-Mises yield conditions or not. (08 Marks) a. List and explain various process puru*.,.rs affecting on the metal working processes. PART _ B (10 Marks) (06 Marks) (04 Marks) (08 Marks) (06 Marks) a size of $-0.25. (06 Marks) (10 Marks) (05 Marks) (05 Marks) (05 Marks) (10 Marks) What is the percentage contribution of friction to the drawing stress at 40o/o reduction of area using two lubricants having co-efficient of friction value, p - 0.05 and p = 0.1 with cr = 15' die and a fixed parallel plug. a. Sketch and explain basic types of extrusion. b. Explain the different methods used in the production of seamless pipes and tubes. a. Sketch and explain a progressive die used for the production of washer. b. Explain how a cylindrical cup is formed. c. Explain the concept of forming limit criteria. a. Sketch and explain explosive fbrming. b. Explain the different methods used for the production of metal powders metallurgy. c. List the advantages, limitations and applications of powder metallurgy. b. Define and explain the concept of workability. c. Write a note on deformation zone geometry. a. With simple sketches, explain different types of forging operations. b. Explain various die-design parameters. c. A block of lead 25mmx 25mm x 150mm is pressed between flat dies to 6.25mmx 100mm x I 50mm . If the uniaxial flow stress is Go = 6.9 MPa and Determine the pressure distribution over the 100 mm dimension. a. List and explain different types of rolling mills. b. Briefly explain different types of rolling variables. c. What are the problems and defects occurred in rolled products? With a simple sketches, explain the drawing die. List and explain different methods of tube drawing. (05 Marks) (10 Marks) (10 Marks) (08 Marks) (06 Marks) (06 Marks) (06 Marks) in powder (08 Marks) (06 Marks)
- 9. USN 10MEs6 Fifth Semester B.E. Degree Examination;' Juna/July 2016 Turbomachines 'Iirne: 3 hrs. Max. Marks: 100 Note: 7. Answer any FIVE full questions, selecting atleast TWO questionsfrom each purt. 2. Use of Steam table and thermodynamic dqta handbook is perrnitted. PART _ A a. Explain any six major differences between turbornachines and positive displacement machines. (06 Marks) b. What are unit quantities/ Derive the expressions to each of them. (06 Marks) c. The following data were obtained from the main characteristics of a Kaplan turbine of runner diameter 1 m. Pu:30.695, Qu: 108.6, Nr: 63.6. Estimate (i) The runner diameter (ii) The discharge (iii) The speed of a similar runner working under a head of 30 m and developing 2000 kW. Also (iv) determine the specific speed of the runner. (08 Marks) a. Define the polytropic efficiency of a turbine. Draw the T-S diagram and show that the polyropic efficiency is given by () (J o t< a" d a(s o cc C) ri aXw ;J. EO =ia50" .= c.r (€t 9[i.J= FC) E,U aaJ O tl) 6() E o0tr '1,E }--(5c6- 'OC€ :'6'tro rt- c-X trE ?.Y 6= atE Eg b0o tr50 o= =cdI- 0J =o.J U< * a.1 a z = = = rn=t+l [fr]where n - [ndex of polytropic process,, y : Ratio of specific heats. (10 Marks) b. Air flows through an air turbine where its stagnation pressure is reduced in the ratio 5:1. The total-to-total efficiency is 80%. The air flow is 5 kg/s. If the total power output is 500 kW, find (i) inlet total temperature (ii) actual exit total temperature (iii) actual exit static temperature if the flow velocity is 100 m/s (iv) total-to-static efficiency. (10 Marks) a. Obtain an expression as shown below for energy transfbr and degree of reaction as a function of discharge blade angle 0z for a turbomachine. Make the following assumptions: (i) uz :2ut , (iD Constant radtal velocity , (iii) No whirl velocity at inlet and inlet blade angle 45". *_2+cot0, 4 b. In an axial flow turbine, the discharge blade angles are 20" each, for both the stator and the rotor. The steam speed at the exit of the fixed blade is 140 m/s. The ration of ! = 0.7 at u the entry and 0.76 at the exit of the rotor blade. Find (i) the inlet rotor blade angle, (ii) the power developed by the blade ring for a mass flow rate of 2.6kgls, (iii) Degree of reaction. (10 Marks) a. With the help of inlet and outlet velocity diagrams, show that the degree of reaction for an axial flow compressor is given by B - )( hotp, + cotB,] where, Vo: axial flow velocity, u: blade velocity,, B1 and B2 are the vanes angles of inlet and outlet. (lo Marks) (10 Marks)
- 10. 10ME56 b. A centrifugal pump delivers water against a head of 25 m. The radial velocity of flow is 3.5 m/s and is constant, the flow rate of water is 0.05 m3ls. The blades are radial at tip ancl pump runs at 1500 rpm. Determine (i) Diameter at tip, (ii) Width of blade at tip, (iii) Inler diffi.rser angle at impeller exit. (t0 Marks) PART _ B a. With a neat sketch, explain the pressure-velocity compounding of steam turbine. (08 Marks) b. In a Curtis stage with two rows of moving blades the rotor are equiangular. The first rotor has angle of 29o each while second rotor has angle of 32o each. The velocity of steam at the exit of nozzle is 530 m/s and the blade coefficients are 0.9 in the first, 0.95 in the stator aurJ in the second rotor. If the absolute velocity at the stage exit should be axial, find (i) Mean blade speed (ii) The rotor efficiency (iii) The power output for a flow rate of 32 kgls. (12 Marks) a. Show that for a Pelton turbine the maximum hydraulic efficiency is given by _ l+CocosB, Ifrnar - z where Cu is blade velocity co-efficient and 0z is blade discharge angle. (08 Marks) b. Explain the function of a draft tube and mention its types. (04 ltarks) c. In a Francis turbine, the discharge is radial, the blade speed at inlet is 25 m/s. At the inlet tangential component of velocity is 18 m/s. The radial velocity of flow is constant ancl equal to 2.5 m/s. Water flows at the rate of 0.8 m3/s. The utilization factor is 0.82. Find (i) Euler's head (ii) Power developed (iii) Inlet blade angle (iv) Degree of reaction (R). Draw the velocity triangles. (08 Marks) a. What are the applications of multi-stage centrifugal pumps? With a neat sketch, explain centrifugal pumps in series and parallel. (08 Marks) b. Explain the phenom€non of cavitation in centrifugal pump. (04 Marks) c. A centrifugal pump impeller has radial vanes from inner radius of 8 cm to outer radius 24 cm. The width of the impeller is constant and is 6 cm between the shrouds. If the speed is 1500 rpm and the discharge is 250 lit/s. Find (i) change in enthalpy (ii) The outlet pressure if inlet pressure is 0.8 kPa and water flow is outward. (08 Marks) a. Define the following terms of centrifugal compressor: (i) Slip factor (ii) Power factor (iii) Pressure coefficient. (06 Marks) b. Explain the phenomenon of surging in centrifugal compressor. (04 Marks) c. The speed of an axial flow compressor is 15,000 rpm. The mean diameter is 0.6 m. The axial velocity is constant and is225 m/s. The velocity of whirl at inlet is 85 m/s. The work clone is 45 kJ/kg of air. The inlet conditions are 1 bar and 300 K. Assume a stage efficiency of 0.89. Calculate (i) Fluid deflection angle, (ii) Pressure ratio, (iii) Degree of reaction, (iv) Mass flow rate of air. Power developed is 425 kW. **{<*{< ) of ^t (10 Marks)
- 11. USN roMnso Fifth Semester 2016 'Iirne: 3 hrs. Max. Marks: 100 Note: I. Answer any FIVE full questions, selecting atleast TWO questions from each part. 2. Use of Steam table and thermodynamic data handbook is permitted. PART _ A a. Explain any six major differences between turbomachines and positive displacement machines. (06 Marks) b. What are unit quantities? Derive the expressions to each of them. (06 Marks) c. The following data were obtained frQm the main characteristics of a Kaplan turbine of- runner diameter I m. Pu:30.695, Qr: 108.6, N*: 63.6. Estimate (i) The runner diameter (ii) The discharge (iii) The speed of a similar runner working under a head of 30 m and developing 2000 kW. Also (iv) determine the specific speed of the runner. (08 Marks) a. Define the polytropic efficiency of a turbine. Draw the T-S diagram and show that the polyropic efficiency is giverr by (10 Marks) b. Air flows through an air turbine where its stagnation pressure is reduced in the ratio 5:1. The total-to-total efficiency is 80%. The air flow is 5 kg/s. If the total power output is 500 kW, find (i) inlet total temperature (ii) actual exit total temperature (iii) actual exit static temperature if the flow velocity is 100 m/s (iv) total-to-static efficiency. (10 Marks) 3 a. Obtain an expression as shown below for energy transfer and degree of reaction as a function of discharge blade angle pz for a turbomachine. Make the following assumptions: (i) uz =2ur , (ii) Constant radial velocity , (iii) No whirl velocity at inlet and inlet blade angle 45o. ^ 2 + cotp, R=- (t0 tVtarks) b. In an axial flow *til., ,t. discharge blade angles are 20o each, for both the stator and the rotor. The steam speed at the exit of the fixed blade is 140 m/s. The ration of L = 0.7 at u the entry and 0.76 at the exit of the rotor blade. Find (i) the inlet rotor blade angle, (ii) the power developed by the blade ring for a mass flow rate of 2.6kgls, (iii) Degree of reaction. (10 Marks) a. With the help of inlet and outlet velocity diagrams, show that the degree of reaction for an axial flow compressor is given by R-Uhotp, +cotB,l where, Vu : axial flow velocity, u: blade velocity, Fr and $2 are the vanes angles of inlet and outlet. (10 Marks) rn=t+l [fr]where n - [ndex of polyropic process, y : Ratio of specific heats. o() o dL (g 0c0 (-) (.) ! (l)X J' (d iJ =(aco ll .< -4, .= c.r dt Y o.) D=tt) E2 :!1 fJ OU ts- o0t .E(g !E .GJ 'O c3 :' (.) 'tro rr. d c*etro- ();.=r. .= 6: 3(J'a tE !o = ?i o.=>'* o0o c- 50 ()= EE =c)(, U< -a{ (.) z d H o o. E
- 12. 10M856 b. A centrifugal pump delivers water against a head of 25 m. The radial velocity of flow is 3.5 m/s and is constant, the flow rate of water is 0.05 m3/s. The blades are radial at tip ancl pump runs at 1500 rpm. Determine (i) Diameter at tip, (ii) Width of blade at tip, (iii) lnlet diffuser angle at impeller exit. (10 Marks) PART _ B a. With a neat sketch, explain the pressure-velocity compounding of steam turbine. (08 Marks) b. In a Curtis stage with two rows of moving blades the rotor are equiangular. The first rotor has angle of 29" each while second rotor has angle of 32" each. The velocity of steam at the exit of nozzle is 530 m/s and the blade coefficients are 0.9 in the first, 0.95 in the stator and in the second rotor. If the absolute velocity at the stage exit should be axial, find (i) Mean blade speed (ii) The rotor efficiency (iii) The power output for a flow rate of 32 kgls. (12 Marks) a. Show that for a Pelton turbine the maxiinum hydraulic efficiency is given by tr,rr* = 1+cocosF' 2 where Cu is blade velocity co-efficient and Pz is blade discharge angle. (08 Marks) b. Explain the function of a draft tube and mention its types. (04 Ntarks) c. In a Francis turbine, the discharge is radial, the blade speed at inlet is 25 m/s. At the inlet tangential component of velocity is 18 m/s. The radial velocity of flow is constant and equal to 2.5 m/s. Water flows at the rate of 0.8 m3/s. The utilization factor is 0.82. Find (i) Euler's head (ii) Power developed (iii) Inlet blade angle (iv) Degree of reaction (R). Draw the velocity triangles. a. What are the applications of multi-stage centrifugal pumps? With a neat centrifugal pumps in series and parallel. b. Explain the phenomenon of cavitation in centrifugal pump. c. A centrifugal pump impeller has radial vanes from inner radius 24 cm. The width of the impeller is constant and is 6 cm between is 1500 rpm and the discharge is 250 lit/s. Find (i) change in pressure if inlet pressure is 0.8 kPa and water flow is outward. a. Define the following terms of centrifugal compressor: (i) Slip factor (ii) Power factor (iii) Pressure coefficient. (06 Marks) b. Explain the phenomenon of surging in centrifugal compressor. (04 Marks) c. The speed of an axial flow compressor is 15,000 rpm. The mean diameter is 0.6 m. The axial velocity is constant and is225 m/s. The velocity of whirl at inlet is 85 m/s. The work done is 45 kJlkg of air. The inlet conditions are 1 bar and 300 K. Assume a stage efficiency of 0.89. Calculate (i) Fluid deflection angle, (ii) Pressure ratio, (iii) Degree of reaction, (iv) Mass flow rate of air. Power developed is 425 kW. (08 Marks) sketch, explain (08 Marks) (04 Marks) of 8 cm to outer radius the shrouds. lf the speed enthalpy (ii) The outlet (08 Marks) {<{<*{<{< 2 of), (10 Marks)

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