5th Semester Mechanical Engineering (June/July-2015) Question Papers

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a. Briefly explain the purpose of communication.
b. Briefly explain the essentialscf a S6und control system.
c. Explain Maslow's and Hery"hutli theories of Human motivation.
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USN l0AL51
Fifth Semester B.E. Degree Examination, 2015
Management and Entrepreneurship
Time: 3 hrs. M ax. M arks: I 00
Note: Answer any FIVE full questions, selecting atleast TWO questions from;?::,:tl$eh part
(05 Marks)
(05 Marks)
(10 Marks)
(05 Marks)
(05 Marks)
(10 Marks)
(05 Marks)
(05 Marks)
and demerits.
(10 Marks)
(05 Marks)
(05 Marks)
(10 Marks)
PART _ B
5 a. Who is an Enterpreneur? Explain the characteristics of an Enterpreneur. (05 Marks)
b. Explain the role of an Enterpreneur in economic development of any country. (05 Marks)
c. Explain the barrier involved in entrepreneurship. (10 Marks)
6 a. What"-is Small Scale lndustry? Briefly explain the need and rationale of SSI's. (05 Marks)
b. ExpJain briefly the Government support for SSI during 5 year plan. (05 Marks)
c. lEhplain the objectives and functions ofWTO. (10 Marks)
PART _ A
1 a. Define Management. Explain different levels of Management ,
b. Explain function al area of Management.
c. What is the profession and administration management?
2 a. Give any four important reasons for the performance of p[anning functions.
b. Difference between strategic planning and tactical planpin$
c. What is decision making? Explain different types offfisions.
3 a. Define an organ izationand explain principles oiggganisation.
b. Write a brief note on the following : i) MBO ' ii) MBE.
c. Discuss any two types of organization structures with highlighting their merits
7 . ' a: Write functions of District industries centers / single window concept.
,,o , '.i b. Write a short note on NSIC.
I ''' " ''"
c. Explain the objectives and functions provided by TECSOK and KSSIDC.
I a. Briefly outline the contents of a project.
b. What is Financial and Social feasibility study?
c. What is Project Appraisal? Explain the steps followed in project appraisals.
(05 Marks)
(05 Marks)
(10 Marks)
(05 Marks)
(05 Marks)
(10 Marks)
*****

2. USN 10ME52
WFifth Semester B.E. Degree Examination, JunelJfrty 2015
Design of Machine Element - I
Time: 3 hrs. Max. Marks:1CI0
Note: 1. Answer any FfW full questions, selccting
atleast TWO questions from each parl
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'
,) 2. Use of design dara hand book is permitted- a.r, -/€ **f)'S -^^- ^ ul-
E PART_A (^.._'
E 1 a. A shaft as shown in Fig.Q.l(a) is subjected to bending land of 3kl.l, tor{q6df I x 106 N-mm
I and an axial force of 15kI.{. Calculate the stresses at 'A' and 'B'. (12 Merks)
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i r Fig.Q.l(a)
:E S b. what is mechanical engineering a.rigrr sl?iJffi"ps involved in mechanical engineering
E * design.
€ € .. i*piiiui"*ialandtriaxialstresseswithne#tches. [3:#::I3
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g E 2 a. State and explain the theories of fui[a$$ptcable to i) Ductile ii) Brittle materials.
r E jnY (06 Marks)
t E b. What is stress concentration? E4pToii the frctors affecting the stress concentmtion.
E € .(* (04 Marks)
$: c. A rectangular beam of lQ@r width and 200mm depth is freely supported oue. a .pao oi
: E 2rn A load of l0k}.{ {@pped on the middle of beam from a height of l0mm. Find the
E E maximum instantanoeBdeflection and stress induced in the beam. Take E:2 x 105 MPa.
tsE .(.v (loMsrks)
E ; " ,"'i*"'
BE 3 a. Explain with,fo ileat sketches, the different types of varying stresses.
E q b. Write a
"ffiryir
S-N diagram.
(05 Marks)
b. Write a qffimbh S-N diagram. (0s Marks)
,.E c. A stqe,|feitilever is 200mm long. It is subjected to an axial load which varies from 150N
X E---------------- (cp1ffision) to 450N (tension) and a transverse load at its free end which varies from 80N
E E 1p$ff fZON (down). The cantilever beam is of circular in cross section having a diameter of
aE -6fU
for the fust 50mm and diameter'd' for the remaining length. Determine its diameter
.E" & . .r assuming the following:
E E ^ Factorof safety =2
g t. iS* ' Yield st ess = 330 Mpa
:- il-J Endurance limit = 300 MPa
:T
- Shess concentration frctor = 1.44 forbending
g correctionftctors =lflt::*'::'l*Ti""ur*
E l for bending
t Size frctor = 0.85.
F Surfrce correction factor = 0.9
- Notch sensitivity = 0.9
1 of3
(10 Marks)

3. 10M852
4 a. Two circular plates with 2d and d as outer and inner diameters are clamped together by
means of a bolt as shown in Fig.Q.a(a). The bolt is made of plain carbon steel
(oy: 380 MPd,E:207 GPa) while the plates are made of aluminium [E : 71 GPa]. The
initial pre load is 5kN in the bolt and external force acting on the joint is 10kN. Determine
the size of bolt if factor of safety :02. Take ot - 152 N/mm2.
An offset bracket is fixed to a vertical steel column by means
Fig.Q.a(b). Determine the diameter of bolts. Take ot : 100MPa.
: {- Fig.Q.a(a)
'ffi pART-BPART _ B
A sf13ft,,5'"$upported in bearings 600mm apart. It carries a pulley of diameter 500mm at
250ry.ii#rto the right of left bearing and another pulley of diameter 380mm at l30mm to the
o,f#l bgaring. The belt drive in left pulley is vertically downward while that on the right
_ *1""g,,.ulley is horizontal. The permissible shear stress is not to excee d, 42MPa. The maximum
nli nsion in smaller pulley is not to exceed 5500N, coefficient of friction is 0.3 and angle of
contact is 180o. Find the diameter of shaft. (20 Marks)
a. Design a Cotter Joint to resist a load of 12kN which acts along the axis of rod having
following permissible stresses.
oc : 80 N/mm' or- 40N/mm2 and r :32N/mm2. (10 Marks)
b. Design a protective CI flange coupling for a steel shaft transmitting 15kW at 200rpm and
having an allowable shear stress of 40MPa. The working stress in the bolt should noiexceed
30MPa. Assume that the same material is used for shaft and key and the existing stress is
twice its value in shear stress. The maximum torque is 25% greater than the full load torque.
The shear stress for CI is 14 MPa. (10 Marks)
b.
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4. ME52
7 a. An eccentrically loaded bracket is welded to a support as .7(a).The
permissible shear stress for the weld material is 80MPa. Determine weld.
(10 Marks)
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b. Two plates of lOmm thick each are to be joined by means of a sifi"ftfe'iiveted double strap
butt joint. Determine the rivet diameter, pitch, strap thickness and efflrciency of joint. Take
ot: 80 MPa and t : 60MPa. (10 Marks)
8a. An electric motor driven power screw moves a nut rn a"horuontal plane against a force of
75kN at 300mm/min. The screw has a single threaduios6mm pitch on a major diameter of
40mm. The friction coefficient at screw threads js,O lSstimate the power of the motor.
ir1r,. -,,,ii (10 Marks)
A vertic al 2-start square threaded screw of [0$*m mean diameter and 20mm pitch supports
a vertical load of 18kN. The nut of screw is"iltted in the hub of a gear wheel having 80 teeth
which meshes with a pinion of 20 teetJt' The mechanical efficiency of pinion and gear wheel
drive is 90%. The axial thrust on sc,fffiifl taken by a collar bearing 250mm outside diameter
and 100mm inside diameter. A{4#ihg uniform pressure conditions, find the diameter of
pinion shaft and height of nut.,w:hefl friction coefficient for vertical screw and nut is 0.15 and
that of collar bearing is 0.2.,,{*e t: 50MPa and Pu: 1.4 MPa.
,
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b.
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Note: 7. Answer any FIW full questions, selecting
utleast TWO questions from each part.
2. Missing datu, tf ony, may be suitably assumed.
:,
PART_A '
I a. List out the different types of fuels used for steam generation. Briefly explain"id;;
b. With a neat sketch, explain the working of travelling grate stroker.
c. with a neat sketch, explain the working of cyclone burner.
With a neat sketch, explain the working of Schmidt - Hartmamffler.
Explain with aneat sketch the working of hyperbolic cooliug"tower.
USN
Fifth Semester B.E. Degree Examination,
Energy Engineering
Time: 3 hrs.
3 a. Draw the schematic diagram of DG power plant. Mention the
, the plant. ,. ,
b' Explain the different methods used starting diesel engines.
c' Write a note on filters used in intake system of diesel engine.
2a.
b.
c.
r0ME53
Max. Marks:100
(10 Marks)
(06 Marks)
(04 Marks)
(10 Marks)
(05 Marks)
function of each component of
(10 Marks)
(06 Marks)
(04 Marks)
(06 Marks)
(04 Marks)
PART _ B
working of Fast Breeder Reactor State its advantages and
(10 Marks)
Determine the height of chimney to get a net draught of 12 mm if the total draught losses are
4 mm. The temperature of air is 25oC and the temperature of chimney gases is 300'C. The
mass of air used per kg of fuel is 18 kg. One kg ofaii occupies a volume of 0.7734 m3 at
NTP. .,
''
, (05 Marks)
4 a. What is a surge tank? What aie its functions?
electric power plant. . ,. "., '
List out the tlpes of surge tanks used in hydro-
b. what do you mean by water hammer? How it will be formed?
c. The run-off data of a river at aparticular site is tabulated below :
Mdnth
Mean discharge
millions of m3/month
Month
Mean discharge
millions of m3/month
Jan 40 July 70
Feb 25 Aug 100
Mar 20 Sep 105
April 10 Oct 60
Mav 0 Nov 50
June 50 Dec 40
i) Draw the hydrograph and find the mean flow
ii) Draw the flow duration curve
iii) Find the power in MW available at mean flow if the head available is
efficiency of generation is 80%.
100 m and overall
(10 Marks)
a.
b.
With a neat sketch, explain the
disadvantages.
Write a note on :
i) Radiation hazards
ii) Radioactive rvesfe disnnsql

6. b.
c.
10ME53
What is the difference between a pyrheliometer and a pyranometer? Describe the principle
ofAngstrom Pyrheliometer. (06 Marks)
What is the principle of photovoltaic power generation? With a neat sketch, explain the
working of photovoltaic cell. 1oo vtartrs;
Determine extraterrestrial normal radiation and extraterrestrial radiation on a ho:izontal
surface on February 15 at2 pm solar time for 40o N latitude. Also determine the toial solar
radiation on the extraterrestrial horizontal surface for the day. -, '(0g Marks)
Describe the tidal energy harnessing by "Two basin with liked basin" method.7a.
b.
c.
8a.
b.
c.
List out the problems associated with OTEC power plant.
With a schematic diagram, explain the woiking of vapour Oom6Aid-a
plant.
.1i,.., ,*,i
clearly describe the production of oxygen from photosynthe,s iocess.
with aneat sketch, explain the u,orking of Indian type bio[ablplant.
With aneat sketch, explain the working of fluidized bed gasifier.
(06 Marks)
(06 Marks)
geothermal power
(08 Marks)
(06 Marks)
(08 Marks)
(06 Marks)
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2 of 2

7. USN
Time: 3 hrs.
Fifth Semester B.E. Degree Exarnination, June/July 2015
&grmtarymEes ffif EUt[ ffichfi s?€]s
10M854
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Note: Answer sruy FXVE fall questiovas, sekcrtrug
atleast TWO qaestions lrom eech part"
PAR.T - A
!!*
What is the principle ofvirtual work? Explain. i!.,...i,
ln an I.C. engine mechanism the crank is 100mm, connecting,lod is 300mrn. The crank has
turned by 60" from I.".l.tl. .d' force rr: it ='= 3CIi,0}{ i:;:: on',&'e'Piston towards crank shaft.
Determine ali the forces ar',/arious points of rnechanisrrr aid torque applied on crank.
.,,, , "' (14 Marks)
a. Define the terms coefficient of fluctuation of spre.{ and coefficient of fiuctuation of energy.
"""u"'
i"'ii'i' (04 MafkS)
b. A certain machine requires a torque of (50G+60 sinO) N.m to drive it, where 0 is the angle
of rotation of shaft rneasuied from certain datum. The machine is directly coupled to an
engine which produces a torque of (500 + 60 sin 20) Nrn. The flywheel weighs 500N and
has radius of gyration of 0.4rn.-The inean speed is 180rprn. Determine: i) Fluctuation of
energy; it) % fluctualicl ,i;'soeer;; ii") rciliili,rm a,ld. maxiraiirn aagular acceleration of
flywheel and coresponciir.g shatl posi"ions. (tr6 Marks)
a. Derive an expression tolfind frictional torque for a ti.at pivot considering uniform wear
theory. .,,r r , (05 Marks)
b. In a thrust bearingittre external and internal radii of the contact surfaces arc 210mm and
160mm respectiGly. The tctal axial ioad is 60kN and coefficient of friction is 0.05. The
shaft is rotatihg''Lt a speeri of 380 {pm. intensity of pressure is not to exceed 350 kN/m2.
Calculatei;ffiwer lost in friction; ii) Nurnber of collars required for thrust bearing.
',"'.it (05 Marks)
c. 4 pi*ey is^driven by a f,.zr,lte'r';l00rn::r
'','iCe
znC 6n:, thick. T1':e Cerisity of belt rnaterial is
g/m3. The angl: l: ii,i-r is ilO' e-:d. rle coeflicien'i of *iction is 0.3. The maximum
@&ess in the belt is not to exceed 2 iIPa. F-hC ihe ma::irnurn power that can be transmitted
gp;and coresponding speed oithe bett. (10 Marks)*. #
a. Explain the static and dynamic baiancing. (05 Marks)
b. A rotating shaft carries f,cur unbalanced :r.,lasses 18kg, 14kg, 16kg and i Zkg at radii 50mm,
60m, 70mm and 60mrn res$ectively. The seconci, third and fourth masses revolve in planes
80mm, 160mm and 280mm respectively measured from the plane of first mass and are
angularly located at 60o,135o and.270o respectiveiy measured anticiockwise from the first
mass locking fiom thls i::',s: end,l'f :h, sha:1. The.s:.a:1 is d"i,ilariicafiy baianced by two
masses, bctir iocated 5,Jii,.-r- -:aiii aird:i,',.-,.vilig itrprat;is:c.iivra;,'beuween tilose of first and
second masses and miiiv,,riy be'iu,e*:: :[ose ct' thiri:i and fourth txasses. Determine the
magnitudes of the masses and their respective anguiar positions.
I of2
(15 Marks)

8. 5a.
b.
6a.
b.
10MEs4
PzRT - E
Explain riirecl"';r d Te.i,{li:e ciar. Li me::i :,, ci af' i::ii i,fictr'6. (10 Marks)
A V-fwin engine hr:,s fii; crr'iiric,e:." z,xi;':, ,,r.,. ",:i;.::t angi.; ;,.iri. ccanecling rods operate a cofilmon
crank. The reciprocating mass per r;,viinder is 10kg. The crank is 75mm long and eqph
connecting rod is 350mm long. Show that the engine may be balanced for primary effecffiff
means of a revolving balance mass. If the speed of crank is 500 {pffi, what is the mq+5imttin
vatrue of resr"ritant secandary force an,:i Ll which direction does itact? * (ffiarkg
ffiff*h. *
Derive an expressicn fur deterr:ining speed of spindie of a porter gov,,grftmYaking into
account the friction at [,ne s]eeve" *'*,;.q] (08 Marks)
'ln a spring ioaCe<i i.{a"frleil governci'. 'rhe extrerne radii of rota.tion qf*ffiffi" are 80mm and
120mnr. The oaii arraa:-i the s;eeve :,iritl of tse beii crank trever arerBl,fiil l in length. Mass of
ea.ctrr .baii is 2*9. If the seeed at i':,,: i:z.;.reme pos;tions are 400,: and 420 rpm. find
i) spring constant and ii) Initiatr coffrpression of the spring. i] (12 Marks)
ofprecession, axis of couple, planes
(06 Marks)
(20 Marks)
7 a. Derive an expression for gylsscopic cr-rrpl.e.
b. With aneat sketch shcw the following exis of spiri, e,xm
of spin, precession an<i couple. , -i'
(06 Marks)
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c. An aeroplane makes a cornplete haif clrcle of S&,naeter radius, towards left when flying at
200 km&r. Th.e ratasy er'gine snd th.e prope-tte'l! 'the plane have a mass 40kg with a radius
of gyratlon oi 0.30nr.. Tne engine rur.s at 24tr# rprr clock wise, when viewed from the rear.
Find the gyroscopic coulie on '',.he p;nee aRcl state its effect on it. Wtat wiil be the effect, if
the aeroi:iaiae 'ir:.rrrs t,r its iight rnsl:eaci *f"i:efi i (0g Marks)
'i" "i''
''''"'''
A tangent cam with a base circhdiameter of 50mm operates a roller follower 20mm in
diameter. The line of stroke.ofthe rcllerpasses throrigh the axis of cam. The angle between
the tangential fuces of cam',i*,60o, speei of the cam. shaft 2l}rprnand the Iift ofthe follower
15mm. Calculate: . ,,
".
*
a. The main dimensions''of ihe cam
b. The accelerationsffithe fbllorver at
i) The begii*aihg of the lift
ii) Wire.r+ihe roiier;ust toucires the nose
... mr ,. i
iii) Th€,drebx of ti:e circuiar nose"
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2 of2

9. USN
5a.
b.
10MEss
y 2Ol5
Max. Marks:100
the basis of
(10 Marks)
(05 Marks)
(05 Marks)
(05 Marks)
(15 Marks)
(06 Marks)
(04 Marks)
(10 Marks)
(08 Marks)
suitable sketch
(06 Marks)
(06 Marks)
(08 Marks)
(06 Marks)
Fifth Semester B.E. Degree Examinatior, Jun
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Time: 3 hrs.
Manufacturing Process - lll
Note: Answer FIVE full questions, selecting
at least TWO questions from each part.
|a.withneatsketches,explain.n..,uffiofmetalwor.kingproceSSeS|o'{I
force applied. . '.,..,
b. Differentiate between cold working and hot working.
c. Explain the concept of true stress and true strain.
!
a. Explain with a neat sketch, the hydrostatic pressure in metal *rffi
b. Explain the effect of following on metal working processes;.,,,, ,;',,-li,
i) Friction ii) Lubrication iii) Strain rate .,,.,.r "
a. List and explain die design parameters in forging.
b. Write a note on materia$low lines in forging.
-.,,.
,
c. with a near sketch, .*pffiin any rwo forgiig lq#;nrr.
PART - B
a. With neat sketches, explfin the differe,f.It types of rolling mills. m Marks)
b. Explain rhe fricrion hill ih rolling pro"ir*.
- v
{Ii rnru.r.rl
c. A 300 mm wide aluminiuT_ alloy,ffi is hot rolled from an initial thickness of 25rmm to a
final thickness of 15 mm. T|.{@ier of_the
rylls is I m and spefid of roration is: 120 rpm.
The plane strain flow stress is 7O tvtpu at the .rfir*ry of rolls ;& l0 Mpa at rhe exir from
the roll gap due to increafu velocity. Find the ro$ng laod and power required. Assume
a.
b.
8a.
b.
What is drawing!. With a neat st etcn e*ptuin tt e process of rod drawi" *?:''v v rur c. r'rv(rL DreLvll s^.yrd.ru tuc Pluuess oI roo orawmg.
CllsifV
,
the-'dfferent processes used in tube drawing. With the tr-etpof
explain the process of moving mandrel
c. Explaqlp"bptimal cone angle and dead zoneformation in drawing.
a' wi*'f, neat sketch, explain backward extrusion process. Why power involved in backward
extrus.lon is much lesser than direct extrusion elb' Bti.flt .,,plain the metal flow pattern in the exrrusion process with and withour lubriffi?H'
''
r'rlqin thptrrori...r,o Jafo^+. i- ^-.+-,.^i^.^
I (OO Vfffi;c' List and explain thd various defects in extrusion (07 Marks)
with neat sketches, explain the working of progressive die and combination die arrangement
with neat sketches explaint the folrowing processes:
i) Roll bending ii) Deep Orawing (10 Marks)
with a neat sketch, explain electrohydraulic forming process. (06 Marks)
With a flow chart explain the operations involved in-making powder metallurgy puro.
- ---
c. List the applications of powder metallurgy components.

10. USN
Fifth Semester B.E. Degree Examination,
Turbo Machines
Time: 3 hrs.
Note: Answer any FIW full questions, selecting
atleast TWO questions from each part.
I a. Define turbomachine. Explain,h. p,l*ffi;f.onents of turbomachine.
i10ME56
Max. Marks: 100
(05 Marks)
(08 Marks)
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b. Define specific speed of pump. Show that specific speed of pump is given by N, -
c. A turbine is to operate under a head of 25m at 200rprn The disqlqse i. , *,ntll.Ti',Tl
efficiency is 90%, determine the performance of the turbine undgr qhoad of 20 metres.
1-i (08 Marks)
2 a. What is Reheat factor? Show that the reheat factor is gregleB$il* unity in multistage turbine.
b. The output of a tkee stage gas rurbine is 3otvffr F1i" ,n"o coupling
"t'JnT;L?temperature of 1500K. The overall pressure ratio aci6ls the turbine is 11.0 and efficiency
88%. If the pressure ratio of each stage is ttrdbqme, determine: i) pressure rftio of eacir
stage; ii) polytropic efficiency; iii) mass npqhTe; iv) efficiency and power of each stage.
Assume fair = 1.4, Cp - 1.005 kJ/kg K, rlmec.h i9loh. (10 Marks)
3 a. Define the degree of reaction una *tq*tnut the relationship between utilization factor (e)
and degree ofreaction (R) for an axrp ftow turbine is given by
V, -V.,€_r/
Y, - RV,. ;
b. Liquid water flows at the rate of 31.5 kg/s through a rotor of a radial flow turbo machine,
where the inlet and outtret diameters are 125mm and 2OOmm respectively. The other data?s
relating to the turbo machine are as follows: speed - 6000 rpffi, absolute velocity at inlet is
35 m/s and is axial in direction, absolute velocity at exit is 160 m/s, and its angle is 30o.
Determine the relative velocities and also power required to drive the rotor in kW. Also
determin-e'the'change in static and stagnation enthalpy across the rotor and change in static
and st4gnation pressure across the rotor and degree of reaction. (12 Marks)
',:
4 a. Wjffi:tfre help of inlet and outlet velocity triangles, show that the degree.of reaction for an
.-' ''- v,''-
i'.61i31
flow compressor, R = 'u cot Bm , where Vu is axial velocity, u is blade speed and
l.l
.,t.,-i'
/-
----r
u
cotF,=ry,whereB1and$2areinletandoutletbladeang1ewithreSpectto
axial direction. (to Marks)
b. A single stage axial blower with no inlet guide vanes is runnin g at 3600 rpm. The mean
diameter of the rotor is 16cm and mass flow rate of air through the blower is 0.45 kg/s. In
the rotor, the air is turned such that the absolute velocityof air at exit makes an angle of 20o
with respect to the axis. Assume that the axial component of fluid velocity remains constant,
determine power input and degree of reaction. Assume that the density of air is constant at
1. 185 kg/mi and area of flow is 0.02m2. (r0 Marks)
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H3t4

11. 10M856
PART _ B
a. What is compounding in steam turbine? Explain with neat sketch impulse-reaction turbine.
(10 Marks)
b. In a single stage impulse steam turbine the mean diameter of the blades is lm. It runs at
3000 rpm. The steam is supplied from anozzle at a velocity of 350 m/s and the nozzle angle
is 20o. The rotor blades are equiangular. The blade friction factor is 0.86. Draw the velo6,i,_ty
diagram and calculate the power developed if the axial thrust is 1 17 .72 Newton. (Io_ivtiiks)
..:''l
"1
a. Show that the maximum hydraulic efficiency of a Pelton wheel turbiner.,is'given by
flJ!$d,
where Q is exit blade angle. Also draw inlet and exit ,.f6., triangles.(rlr.,)-u" :
- , , ,,,...wre Q is exit blade angle. Also draw inlet and e:
,,-
.,.,,*o;i.
b. The following datais given for a Francis turbine. Ner head H - qnmjfi t.d N :(;0oil'ilxl
shaft power : 294.3 kW, s:84oA, lh : 93Yo, flow ratio : 0.20r"&i,,e*udtn ratio n : 0.1, outer
diameter of runner : 2 x inner diameter of runner. The thiokr+ehs of vanes occupy 5% of
circumferential area of the runner, velocity of flow is eoa nt at inlet and outlet and
discharge is radial at outlet. Determine: t+;" ' j
i) Guide blade angle. o t,
ii) Runner vane angle at inlet and outlet. ' :
iii) Diameter of runner at inlet and outlet and '"
iv) Width of wheel at inlet.
a. Obtain an expression for the minimun+etpffing speed of a centrifugal pump. (10 Marks)
b. The outer diameter of the impeller of aeentrifugal pump is 40cm, and width of impeller at
outlet is 5cm. The pump is runn*{tg',4"t'800 rpm and is working against a total head of 15m.
The vane angle at outlet is aO"qnMlanometric efficiency is 75%.Deterrnine: i) Velocity of
flow at outlet; ii) Velocity-,ffiftater leaving the vane; iii) Angle mage by the absolute
velocity at outlet with ttrSr,,;$fffi tion of motion at outlet; iv) Discharge. (10 Marks)
*"
a. Briefly explain the_fo-1hing:
i) Surging of,e'pliipressors.
ir) Slip fac'tp" f'st slip coefficient. (10 Marks)
b. An air comdffior has elght stages of equal pressure ratio 1.35. The flow rate through the
compressoi'and its overall efficiency are 50kg/s and 82oh respectively. If the conditions of
atr rt emry are 1.0 bar and 40oC determine: i) The state of air at the compressor exit;
ii) P-olyropic efficiency; iii) Efficiency of each stage; iv) Power required to dr:ive the
cornpressor assuming overall efficiency of the drive as 9Aoh. (10 Marks)
**rk{<rF
(10 Marks)
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