Download AKTU (Dr. A.P.J. Abdul Kalam Technical University (AKTU), formerly Uttar Pradesh Technical University (UPTU) B-Tech 4th Semester (Fourth Semester) 2015-16 ME 401 Fluid Machinery Question Paper
(Following Paper ID and Roll No. to be ?lled in your Answer Books)
Roll N0-
B.TECH.
Theory Examination (Semester-IV) 2015-16
FLUID MACHINERY
Time : 3 Hours Max. Marks:100
SECTION A
1 Attempt all question (2*10=20)
2) Explain the steps involved in the computation of work done by a jet. Of velocity V when it
impinges as a single curved vane at a velocity of v in the direction of jet and de?ects the
water by an angle 9.
b) What are repeating variables and how are they selected?
c) Compare impulse turbine with reaction turbine.
d) What is Dra? tube?
e) De?ne manometric head and what are the ways it is expressed?
f) List the factors which are contributing the cavitation in centrifugal pumps.
g) What is meant by speci?c speed for pump?
h) What is a Surge tank?
i) De?ne the terms Dimensional analysis and Model analysis.
j) List out components used in Hydroelectric power plant
SECTION B
2. Attempt any ?ve (5*10=50)
a) Design a Pelton used for a head of 120 m and speed 300 r..p m. The Pelton which develops
145 kW. Assume C= 0.98, speed ratio= 0.45 and overall ef?ciency= 80 %.
b) A turbine is to operate under a head of 30 m at 300 rpm. with a discharge of 30 m3/s. If the
ef?ciency is 90 %, determine speci?c speed of turbine, power generated and the type of
turbine.
c) A centrifugal pump having an external and internal diameter of 1.25 m and 0. 5 m
respectively is discharging water at a rate of 2000 litres/second against the head of 16 m when
running at 300 rpm. The vanes are curved back at an angle of 30? with tangent at outlet and
velocity of ?ow is constant at 2.5 m/s.
Find:
i. Ef?ciency of pump
ii. Power required.
(1) Describe with neat sketches the working of
i.Hydraulic Ram.
ii.Hydraulic Intensi?er.
e) In an inward radial ?ow turbine, water enters at an angle of 22? to the wheel tangent to the
outer rim and leaves at 3 m/s. The ?ow velocity is constant through the runner. The inner and
outer diameters are 300 mm and 600 mm respectively. The speed of the runner is 300 mm.
The discharge through the runner is radial. Find :
i. Inlet and outlet blade angles
ii. Taking inlet width as 150 mm and neglecting the thickness of the blades
iii. The power developed by the turbine
0 Obtain an expression for the work done per second by water on the runner of a Pelton wheel.
Hence derive an expression for maximum ef?ciency of the Pelton wheel giving the
relationship between the jet speed and bucket speed
g) Calculate the work saved by ?tting an air vessel for a double acting single cylinder
reciprocation pump.
h) Find the power required to drive a centrifugal pump which to drive a centrifugal pump which
delivers 0.04 m3 /s of water to a height of 20 111 through a 15 cm diameter pipe and 100 m
long. The overall ef?ciency of the pump is 70% and coef?cient of friction is 0.15 in the
formula ht=4?v2 /2gd.
SECTION C
Attempt any two , (2*15=30)
3. Draw a neat sketch of Reciprocating pump and explain the working principle of single acing
and double acting Reciprocating pump.
4. A Francis turbine has an inlet diameter of 2.0 m and an outlet diameter of 1.2m. The width of
the blades is constant at 0.2 m. The runner rotates at a speed of 250 rpm with a discharge of 8
mJ/s .The vanes are radial at the inlet and the discharge is radially outwards at the outlet.
Calculate the angle of guide vane at inlet and blade angle at the outlet.
5. A centrifugal pump is to discharge 0.2 m3/s of water at a speed of 1480 rpm. against a head
of 22 m. The impeller diameter is 50 mm, its width at outlet is 50 mm and the manometric
Ef?ciency is 76 %. Determine the vane angle at the outer periphery of the impeller
This post was last modified on 29 January 2020