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11050 Pages: 2

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
FOURTH SEMESTER B.TECH DEGREE EXAMINATION(R&S), MAY 2019

Course Code: CE206
Course Name: FLUID MECHANICS II (CE)

Assume any missing data suitably.
PARTA
Answer any two full questions, each carries 15 marks.
Show that the maximum efficiency of a jet striking normally on a series of flat

plates arranged over the periphery of a runner is 50 %.
A Kaplan turbine develops 15000 kW power at a head of 30 m. The diameter of
the boss is 0.35 times the diameter of the runner. Assuming a speed ratio of 2, a
flow ratio of 0.65 and an overall efficiency of 90 % calculate the diameter of the
runner and the rotational speed.
Why the suction lift of a centrifugal pump cannot exceed a certain limit?
A jet of water having a velocity of 35 m/s impinges without shock on a series of
vanes moving at 20 m/s. The jet angle at inlet is 30° and jet angle at exit is 60°.
Find: (a) vane angles at entrance and exit (b) work done on vanes per unit weight
of water supplied by the jet; and (c) the hydraulic efficiency.
A Pelton turbine is to operate under a net head of 500 m at 420 rpm. If ೩ single
jet with diameter 18 cm is used, find the specific speed of the machine. Take Cy
as 0.98 and overall efficiency as 0.85.
Derive an expression for the specific speed of a centrifugal pump.
A centrifugal pump discharges 0.2 m*/s of water at a head of 25 m when running
at a speed of 1400 rpm. The manometric efficiency is 80%. If the impeller has an
outer diameter of 30 cm and width of 5 cm, determine the vane angle at the
outlet.
Define the term, Net Positive Suction Head.
PART 13

Answer any two full questions, each carries 15 marks.
Define the terms: i) wetted Perimeter, ii) Hydraulic depth and iii) Hydraulic
radius.
A trapezoidal channel discharging water at the rate of 150 m 3/5 is to be designed

for most economical section. Find the bottom width of the channel and depth of

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Duration: 3 Hours

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