Download AKTU (Dr. A.P.J. Abdul Kalam Technical University (AKTU), formerly Uttar Pradesh Technical University (UPTU) B-Tech 6th Semester (Sixth Semester) 2015-2016 NME 021 Fluid Machinery Question Paper
(Following Paper 1]) and Roll No. to be ?lled in your
Answer Books)
Roll No
B. TECH.
Theory of Examination (Semester-VI) 2015-16
FLUID MACHINERY
Time : 3 Hours Max. Marks : 100
Sec?on-A
l. Attempt all parts. All parts carry equal marks. Writer
answer of each part in short. (2>< 10=20)
(a) What are ?uid machines or Hydraulic Machines?
(b) De?ne Runaway speed of Turbine.
(c) Differentiate between impulse turbine and a reaction
turbine?
(d) Why do draft tubes have enlarging passage amea in
the direction of ?ow?
(1) P.T.O.
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(e)
(f)
(h)
(1)
(i)
List the characteristic curves of Hydraulic turbine.
Diffenentiate between Static Head and Manometric
Head.
What is the purpose of Priming of a centn'fugal
pump?
What is the purpose ofan air vessel ?tted in the pump?
What do you mean by Maximum speed of a Recipro?
cating Pump?
What will be the total % work saved by ?tting the air
vessel? Explain
Section-B
2. Attempt any ?ve questions from this section. (10X5=50)
(a) (i) In brief; explain the Classi?cation of ?uid machines.
(11) Explain the pn'nciple of moment of momentum equa-
tion and their applications.
(2)
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(b)
(0)
(d)
(i) De?ne Absolute Path, Absolute Velocity, Relative
Path, Relative Velocity
(ii) A jet of water of diameter 50 mm having a velocity
of 20 m/sec strikes a curved vane which is moving
with a velocity of 10 m/sec in the direction of jet.
The jet leaves the vane at an angle of 60 degree to
the direction of motion of vane at outlet Determine
(i) force exerted by the jet on the vane in the direc-
tion of motion (ii) Work done per second by the jet
(i) me inlet and outlet velocity uiangles for a pelton
wheel and indicate the direction of velocities.
(ii) A pelton wheel has a mean bucket speed of 10
m/sec with a jet of water ?owing at a rate of 700
lit/sec under a head of 30m. The buckets de?ects
the jet through an angle of 160 degree. Calculate
power and hydraulic e?iciency.
A Kaplan Turbine runner is to be designed to develop
9100 kw. The net available head is 5.6 m. Ifthe speed
ratio=2.09, ?ow ratio=0.68, overall e?iciency 86%
and the diameter of the boss 1/3 the diameter of the
runner. Find the diameter of the runner, its speed and
the speci?c speed of the turbine.
(3) P.T.O.
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(e)
(f)
(g)
(h)
De?ne Speci?c Speed of a centrifugal pump and
derive the equation for the same.
With the help of a neat sketch explain the working
principle of reciprocating pump.
In a hydraulic ram installation the supply pipe is 6cm.
in diameter and 5m long. The level of the
supply reservoir is 2m above the hydraulic mm. The
waste valve is 15cm. diameter and has an effective
li? of 0.5cm and weighs 14.72 N. Estimat the'quan-
tity of water delivered per second in a tank 10 m
above the ram. Also calculate the number of beats
per minute.
With the help of a neat sketch explain the working
principle of hydraulic ram and hydraulic press.
Section-C
Note: Attempt any two questions from this section.
3. (a)
(15x2=3o)
Explain the ?mctions of the following parts of reac-
tion tubine:
(4)
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(b)
4. (a)
(b)
5. (a)
(b)
(1) Scroll easing (ii) Draft tube
(iii) Guide blades (iv) Runner
Deta'mine?lepowergivenbythejet ofwaterthe mnner
of a Pelton wheel which is having tangential velocity as 20
m/s. The net head on the turbine is 50m and discharge
through the jet water is 0.03 m3/s. The side clearance
angle is 15? and take Cv=0.975.
Explainthetorque oonverterand ?uid oouplingwithneat
sketch.
A single?acting reciprocating pump nmnint at 50 1pm
delivers 0.01 m3/s of water. The diameter of the piston
is 200 mm and stroke length 400 mm. Determine (i) the
theoretical discharge of the pump (ii) Co?e?icient of
discharge (iii) slip and percentage slip of the pump.
Show that the work saved in overcoming friction in the
pipelines by ?tting air vessels is 84.8% for a single act-
ing-recipmca?ng pump.
A centrifugal pump ers at 950 rpm, its outer and inner
diameters are 500 mm and 250 mm. The vanes are set
back at 35? to the wheel rim. If the radial velocity of
(5) P.T.O.
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water through the impeller is constant at 4 m/s, ?nd
(a) the angle of vane at the inlet. (b) the velocity of
water at exit (c) the direction of water at the outlet
(d) the work done by the impeller per kg of water.
Assume entry of .water at inlet is radial.
L6)
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This post was last modified on 29 January 2020