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Old 16th December 2014, 10:37 AM
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Default Re: Fluid Mechanics and Hydraulic Machines question paper

I have Fluid Mechanics And Hydraulic Machines question paper , but as you did not mention that from which university or for which exam you are looking this paper so I have a common sample paper you can take it as sample paper:


FLUID MECHANICS AND HYDRAULIC MACHINES
Full Marks – 70
Time : 3 Hours
Answer Question No. 1 which is compulsory
and any five from the rest.
The figures in the right-hand margin
indicate marks.
1. Answer the following questions : 2 ×10
(i) Differentiate between coefficient of dynamic
viscosity and kinematic viscosity.
State the units of each in SI units.
(ii) Briefly explain the term total pressure and
centre of pressure. Give example of at least
3 hydraulic structures whose design
(ix) What do you mean by cavitation with
reference to centrifugal pump ? Where
does it occur ?
(x) Compare the discharge vrs crank angle
plot in suction and delivery stroke of a single
acting and double acting reciprocating
pump.
2. (a) 0.0113 m3 of liquid at pressure 6.87 MPa
was compressed to 0.0112 m3. The final
pressure becomes 13.73 MPa. Determine
the Bulk modulus of elasticity. 3
(b) A circular lamina 125 cm in diameter is
immersed in water at an angle with vertical
so that the distance of its edges measured
vertically below the free surface varies from
60 cm to 150 cm. Find the total force due
to water acting on one side of lamina and
the vertical distance of the centre of
pressure below the free surface.
5. A double overhung Pelton wheel unit is to
operate at 30,000 kW generator under an
effective head of 300 m at the base of the nozzle.
Find
(a) Size of the jet
(b) Mean diameter of runner
(c) Synchronous speed of wheel
(d) Specific speed
Assume Generator efficiency 93%, Pelton wheel
efficiency 85%, Coefficient of velocity of nozzle
= 0.97, Speed ratio = 0.46, Jet ratio =12, No. of
poles of generator = 36. 10
6. (a) With the help of a neat labeled diagram,
discuss the governing of an impulse
turbine. 5
(b) A single acting reciprocating pump has its
piston diameter 15 cm and stroke of 30 cm.
involves determination of total pressure and
centre of pressure.
(iii) With the help of a neat sketch (floating body)
explain metacentre and metacentric height.
(iv) Distinguish between one dimensional, two
dimensional and three dimensional flow.
Give sketches.
(v) A flow field is described by V = (y2 + z2) i +
(x2 + z2) j + (x2 + y2) k. Find the rotational
components at (1, 2, 3).
(vi) Distinguish between hydrodynamic force
and hydrostatic force in impact of jet
context. Which principle employed to
evaluate the magnitude of hydrodynamic
force ?
(vii) Define specific speed of a hydraulic
turbine. Write its expression.
(viii) What do you mean by synchronous speed
of generator ? Write its expression.
3. (a) State Pascal’s law and with the help of a
neat diagram and prove it. Give three
examples where this principle is applied.
5
(b) Derive equation for head loss due to
friction in pipe (Darcy Weisbach equation).
5
4. (a) Briefly discuss the constructional feature
like the angle of convergence and angle of
divergence including the length of both
portion stating the reason there of in case
of venturimeter. Use a sketch. 5
(b) A venturimeter is used for measuring the
flow of petrol with sp. gravity 0.81 in a pipe
line inclined at 35° to horizontal . The inlet
to throat area ratio is 4. If the difference in
the mercury level in the gage is 50 mm,
calculate the flow in litres per hour if the
pipe diameter is 0.3 m. Assume discharge
coefficient of meter is 0.975. 5
It discharges 300 litres of water per minute
at 60 rpm. The suction and delivery heads
are 5 m and 15 m respectively. Find the
theoretical discharge,coefficient of
discharge and percentage of slip of the
pump. How much HP will be required to
drive the pump with its efficiency is 70%.
5
(a) Define specific speed of centrifugal pump.
Derive its expression. 3
(b) A centrifugal pump is required to deliver
40 litres of water per second to a height
of 25 m through a 150 mm diameter and
100 m long pipe. The overall efficiency of
pump is 75% and Darcy’s friction factor
for pipe is 0.06. Determine the motor power
to drive the pump. Assume no other losses
in the pipe line. 7
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