513 B.TECH. DEGREE HGMINATION, MAY 2OL4 Fourth Semester Branch:MechanicalEngineeringi{ProductionEngineering l
MEO1O4O3/PEO1O4O3_HYDRAULICMACHINES(ME'PE) (New Scheme-2010 Admission onwards)
i
[Re gul
fr*"
r
arllmprovemenUsupplement aryl
Maximum: 100 Marks
Three Hours
Part A Answer all questions' Each question caties 3 marhs'
1. Differentiate between: Laminar and Turbulent flow' 2. What is meant bY ImPulse turbine ? 3. What is the function of the Impeller in a centrifugal pump ? 4. What factors affecting cavitation in pump ? 5. What is meant by self-priming pump ?
(5x3=15marks)
Part B Answer allquestions' Each question carries 5 marhs'
6. Define Newtonian and Non-Newtonian fluids' 7. Compare pelton wheel and Kaplan turbines in all aspects' 8. How pumps are selected with performance curves ? Explain' 9. What are the factors affectin'g cavitation in turbines ? 10. What
are uses of air vessels in pumps
?
(5x5=25marks) Part
C
Answer all questions' Each question carries L2 marhs'
width and depth of flow of the section' Assuming a loss of head equal to 1.50 m. A flat hump is to be built at a certain flow' minimum height of the hurnp to provide a critical
11. A uniform flow of rz
ma/s occurs
in
a long rectangular channel of b m
upstream velocity head, compute
Or
Turn over
2
c513
12. A square plate weighing llb N and of uniform thickness and B0 cm edge is hung so that horizontal jet 3 cm diameter and having a velocity of 12 m/s impinges on the plate. The center line of the jet is 15 cm below the upper edge of the plate, and when the plate is vertical, the jet strikes the piate normally and at its center. Find what force must be applied at the lower edge of the plate in order to keep plate vertical. If the plate is allowed to swing freely, find the inclination to vertical which the plate will assume under the action ofjet.
(a)
13.
(b)
1t
19
Tests were conducted on a Francis turbine of 0.8 m diameter under a head of g m. The turbine developed 115 kw running at 240 r.p.m. and consuming 1.2 m3/sec. If the same
operaied under a head of 16 m predict its new speed, discharge and power. what are the requirements of a governor in hydropower Installation ?
turbine is
(6+6=12marks) 20.
Or
L4.
Design a Pelton wheel for the following data
(a) Gross head available = (b) Losses in penstock = (c) Power to be developed = (d) Speed of the wheel = (e) Overall efficiency =
:_
170 m TOVo
of
gross head
600 kW. 860 r.p.m. 86Vo
Assume any missing data suitably.
15' (a) If a centrifugal pump does not deliver any water when started, what may be the probable causes and how can they be remedied
ft)
?
The impeller of a centrifugal pump is 35 cm outside diameter and 17.5 cm internal diameter. The vane angles of the impeller at inlet and outlet are 30o and 25" respectively. The pump runs at 1400 r.p.m. The velocity of flow through the impeller is constant. Find the work d.one by the impeller per second per kg of water.
(6+6=12marks) Or 16.
(a) (b)
Define a centrifugal pump. Explain the working of a single stage centrifugal pump. The water is to be pumped out of a deep well under a total head of 90 m. A number of identical pumps of design speed 1000 r.p.m. and specific speed g00 r.p.m. with a rated capacity of 1b0 lps are available. How many.pumps will be required and how should they be connected ?
(6+6=12marks) 17.
A
jet
of water having a velocity of 20 m/sec strikes a curved vane, which is moving
with a velocity of L0 m/sec' The jet makes an angle of 20' with the direction of motion of vane at inlet and leaves at an angle of 130' to the direction of motion of the vane at outlet. Calculate : (a) Vane angles, so that the water enters and leaves the vane without shock.
(br
work done per second per unit weight
of
water striking the vane.
(6+6=12marks.
i 513
G 513
3
ontal he
jet
i8.
plate order which
(a) Expiain with suitable example about the collapse of bubble theory' (b) How we can prevent cavitation damage in pumps and turbines ? Explain'
pumps i9. with neat sketch explain the working principle of following
(a) (b)
ubine rine is
(6+6=
12
marks)
:-
Reciprocation PumP and
Jet pumP.
(6+6=12marks) Or
marks)
20.
with neat sketch explain the working principle of following pumps :-
(a) Gear pumP and (b) Vane pump.
(6+6=12marks) 15
probable
liameter' he pumP
ork done E marks)
t-
Iidentical dty of 150 ected
?
12 marks) ta
velocitY
and leaves
,12 marks,
r-
x t2 = 60 marksl
I
4985
G +997
relop a
(Pages:
onthly
3)
Reg. No... Narne.......
B.TECH. DEGREE EXAMINATION, MAY 2013 Fourth Semester Rranch : Mechanical Enginecring/Production IJngineering }TL- O1O ,
-
--
4$/PN
O1O
4O3-HYDRAUI,IC MAC}IINIIS (N{8, Ptr)
Nerv S chcmc-Rc gul arllmprovement/S upplcme nt:u.y
:-l'.": H _ ;rs
)
Maximum :
1.00 Mar]<-u
Part A Ansruer all questions. tr)ach question carries 3 m,arks.
-::':':'.:-:::.te
*
-'',-..-,-:
-:
',''1:":
:
''i ::
r.,::t
:-. :i-r-
:-:
-cefiveen
the Sub critical and super critical fior,v in a opcn channel.
by rcaction turbine
?
:-rrction of thc foot valve in centrifugal pump
: ::-:
advantages of rcciprocating pumps.
(5x3=15marks'
tively
Part B Answer all questions. Each que.stion carcies 5 marks"
thing
t
?
:
has
Silly Eths
-r*
,,i.:,i
xulil.
'
'
j.,r,,r
nsing
r
l.:-a-ron's law- of viscosity and give examples of
*- ::= ianctions of draft tubes
;;*,-::'s
r, 'r*.6'
"
' r r'
.,
it
applications.
?
are classifred ? Explain
*ilh ru.t
sketch of any one type.
-: -*--: :actors affecting cavitation in pumps ?
-
- 1---: :t--;et
pump
?
List out's applications. (5 x 5 = 25 marks,
Part
C
Ansu)er all questions. Each. qrrcstion carries 72 marhs.
I , :r*: ,--: ---."-ingavclocityof 20m/secstrikcsacurve vzrnc,whichismovingrvithavelocityof :i r: I I: -,: makcs an angle of 20" with t.he dircction of rnotion of vane at inlet and lr:aves at -r ,irj " . ',' :o thc dircction of motion of thc vanc at outlrit. Calculate:
lrks) lrksl
Turn over' I 3
(a)
G)
vano angres, so that the water enters and leaves the vane without stock. work done per second per unit weight or*uto" striking the vane.
72. By dimensional
G 4997
(12 marks)
o, analysis obtain an
ro11e
ffi1iX'.'.,*:*,',:."_::;$Ttr'":ffii re roughness K, fluid density
Ir on a partiarv submergcd body being the lincar ir*""*;" ,,
iT"'h1""svariables ;,;;;;:r
13. The buckets of a por+^- .r_,surrace
I
rricrioni"{iH,Tt*,t;o':" dt;;;;;ffi;rl
the vctocity ro"ro"
ff :""::}trrilff
denect the jet a total angre of water Ieavipg theT*y"n bucket is ,.si rhar an onrry. Draw
;;;-
or16s",#3:l';
:,11i[:ff "1*,T]ffiH::::*_#;I-;*y::lil;:"ffi
;:ilTfi Tr,3lil*H,,$iii"n1':"nil##rt:*,t+*=1tx,"*"'"x ot'the buckets ; (d)
Efficie".,
buckets at this ,pooa-;
"iur"r.l;'*
;;;",
dcvcroped by the (12 marks
(b) 15'
Explain the working and operation of perton a wheer with thc hcrp of ncat skcrch. pump. Exprain the working ora singre stage ccnrrifugar pump. out of a deep well under a totar head g0 of m. A number
..;l ffff;::"*,"-ar be pumped pumps of d,t
10
rp"u*;;J:ff 'fl:J;::1;:J,Jli,ff (a)
:"r:;,"*f*1T1;,:l;;r:."#ff
n
:s)
ofidentical ,uo
:::o"f (6+6=12malks)
or
What do you m ean by specific speed of a centrifugar pump same. ? r,erive the oxprcssion for the (bl write about (b') the performance characteristics curves of a centrifugar pump.
l7.(a)Distinguishbetweenspecificspeedandunjtspecdofattrrbine.
(b)
I8.
)
+6*12rnarhs)
What are the diffcrent typcs of govornors ? I,)xplain thcm
Or What are the parametcrs affects the turbine pcrform ance
(6+6=12marks) i2
Ex1_rlain
them in cletails. (
I2 nr;rlksJ
t
G 4997 periphet'y in pumps of high 19. (a) What are the methods of converting high velocity at impeller
gessure
?
&)Afurstagepumpisrequiredtopump20.5lpsofwateragainstalleatofl2Smat2400r.p.rn. FInd the specific sPeed of the PgmP:
(6+6=12marks) Or
ion I
20-
for the samc' (a) What do you meh.n by specific speed of a gear pump ? Derive the expression write about the performance characteristic curves of a gear pump.
G)
(6+6=L2marks) t5 x t2 = 60 marksl
Dra ity i at and ng thc
/;
i
rks)
rks)
i
&i4
G 1&16
the
(Fages:
B)
Reg. No....
B.TECH. DEGREE DilMrNATroN, Fourth Semester
MAy
2Ot2
Branch : Mechamcar Engineering / production Engineering ME 010 403 / pE 010 403_HYDRAULIC MACHINE' ,^rr, (Regular*2010 Admissions) "r,
r-r.h .:Je€ Hours
Maximum : L00 Marks
Answer all questions" Each question carries B marks-
- -::rgursh between impulse and reactio:;::f""" ,, :=: a:e propeiler pumps ----_r"' ? _':r---_: r-un away Speed of Turbines.
: -:=:l:-esplain
a"tr
the principle of Similitude" **.: :.:e apphcations of vane pumps.
?
(bxB_lbmarks)
part B
'
Answer
all, questions.
t
of
i
force exerted bv a fruid jer on a singre curved moving prate and .:_ :no\-rng plates. *:::l:1:::"-t::" a series of l-l ', =;=ed of a turbine is regulated ? Explain" -:.' ' -- -: = -cte on selection of pumps from performance curves. Explain this using a chart. l'*: *r. ilre application of corapse of bubbre theory to hydrauric rnachines i' :: :-='- sketch, exprain a serf p,ming pump^ Lisr the ,or"r;*;, ;;_ its operation. -
ks
I
part
(5x5=25marks) C
Answer all questtons"
Each futl question iarries
r ':' ' ' ::=r of 30 mmdiameter, moving '" ,-
-'
li
,norhr.
with a velocity of 15 rn/s, strikes a hinged square plate unirorm thickness Find rhe angie
;.,;,:;?IrilTff::ffi:tr" p'r"t"lrl';;;;;'"r
(12 mark-.
Turn or-er
2
G 1846
1"2" Ajet propelled boat, movingwith a velocity of 5 rn/s, draws water - amid ship. The water is discharged through two jets provided at the back of the ship. The diameter of each jet is 150 mm. The total resistance offered to the motion of the boat is 4905 N. Determine :-
(a) (b)
Volume of water drawn by the pump per second, and Effrciency of the jet propulsions. (12 marks)
13.
A \Mater turbrne has a velociiy of 6 m/s. at the entrance to the draft tube and a velocity of 1.2 mrs" at the exit" For friction losses of 0.1- m. and a tail water 5 m. below the entrance to the draft tube, find the pressure head at the entrance.
L4.
A Pelton turbine develops 3000 kW under a head of 300 m. The overall effrciency of the turbine is 83 7o. If speed ratio= A.46,Cr= 0.98 and Specific speed is 16.5, then find:
(a) (b)
Diameter of the turbine and Diameter of the jet. (12 marks)
1,5" Explain the principle of working of a centrifugai pump" The diameters of an impeller of a centrifugal pump at inlet and outlet are 30 cm. and 60 crn. respectively" Determine the minimum starting speed of the pump if it works against a head of 30 m' (12 marks)
16.
What are muitistage pumps ? Discuss the various pump performance characteristics and selection of pumps from performance curves" (
12 marks)
77. ?he pressure difference'AP'in a pipe of diameter'D'and length'L'due to turbulent flow depends upon the velocity 1/'viscosity'p', density'5 'and roughness 'I(. Closing Buckingham's 7r - theorern, obtain an expression for'AP' (12 rnarks)
'Or 18" fhe pressure drop in an aeroplane model of size
I 10
of its prototype is 80 N I cm2" The rnodel is
tested in rvater. Find the corresponding pressure drop in the prototypes" Tak'e density of air = 1.24 kg'-3 The viscosity of water of 0.01 poise while the viscosity of air is 0.00018 poise. (i.2 manks)
G 1846
! 19.
d fi
pipe of a reciprocating pump Derive an expression for the head lost due to friction in the delivery with and without an air vessel" (1"2 marks)
Or 20. Explain, with neat sketches
Ls) PIs-
b*,
:-
(a) Slurry PumP" (b) Hydraulic ram. (c) Hydraulic Press" Derive expressions for efficiencies in each case" [5 x L2 = 60 marks]
Frks) fitueul
brtlng I
i I
F"tk") I I I
lelection
marks) depends
marks)
model'
nsitY poise. 12 ma
