Reg No.:

Max. Marks: 100

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4 2)
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02000ME206052001

Pages: 3

Name:
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY

Fourth semester B.Tech examinations (S), September 2020

Course Code: ME206
Course Name: FLUID MACHINERY (ME)

PARTA

Answer any three questions, each carries 10 marks
A nozzle forming a jet of 50 mm diameter is supplied with water under a
constant head of 75 m. The jet is directed to strike perpendicularly on to a fixed
flat plate. Calculate the force exerted by the jet on the plate. Take velocity
coefficient of the nozzle as 0.92.
Show that the maximum efficiency for a semi-circular vane when the jet strikes
at the centre is 59.26 %.
Differentiate between inward flow and outward flow reaction turbines.
Water flows through a vertical Francis turbine at the rate of 15.5 m/s and
makes its runner to rotate at 428.4 rpm. The velocity and pressure head at the
inlet of the spiral casing are 8.5 m/s and 240 m respectively and the centre line
of its inlet is 3 m above the tail race level. The diameter and width of the runner
at inlet are 2 m and 300 mm respectively, determine output power, guide vane
angle and runner vane angle at inlet.
Give the significance of unit and specific quantities.
Define unit speed, unit discharge and unit power of a turbine.
In a projected low head hydroelectric scheme 283 1316 of water are available
under a head of 3.66 m. Alternative schemes to use Francis turbines having a
specific speed of 400 or Kaplan turbines with a specific speed of 686 are
investigated. The normal running speed is 50 rpm in both the schemes. Compare
the proposals so far as the numbers of machines are concerned and estimate the
power to be developed by each machine. The units in either installations are to
be of equal power and the efficiency of each type may be assumed to be 90%.
Illustrate the functions of surge tanks.

Illustrate cavitations in hydraulic turbines.

Page 1 of 3

Duration: 3 Hours

Marks
4