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C4819 Pages: 2
100mm of mercury (vacuum). The stagnation pressure at the centre of the pipe,
recorded by the pitot-tube is 0.981N/cm’. Calculate the rate of flow of water through
pipe, if the mean velocity of flow is 0.85 times central velocity. Take ൦0.9൫.

Derive the expression 10 find the discharge of Venturimeter.
Differentiate Pitot tube and Pitot —static tube

PART C

Answer any four questions, each carries 10 marks.
A Pelton wheel has a mean bucket speed of 10 m/s with a jet of water flowing at the
rate of 700 litres/sec under a head of 30m. The buckets deflect the jet through an angle
of 160 degree. Calculate the power given by water to the runner and the hydraulic
efficiency of the turbine. Assume co-efficient of velocity as 0.98.
Explain about draft tubes and its types.
The following data is given for a Francis Turbine. Net head H= 60m; speed
N=700r.p.m; shaft power=293.3kw; 11० =84%; 17-939; flow ratio= 0.20; breadth
ratio n = 0.1; outer diameter of the runner = 2 x inner diameter of runner. The
thickness of the vanes occupies 5% of circumferential area of the runner, velocity of
flow is constant at inlet and outlet and discharge is radial at outlet. Determine
i) Guide blade angle ii) Runner vane angles at inlet and outlet
iii) Diameters of runner at inlet and outlet iv) Width of the wheel at inlet.
Explain about construction and working of centrifugal pump.
The length and diameter of a suction pipe of a single-acting reciprocal pump are 5m
and 10 cm respectively. The pump has a plunger of diameter 15 cm and a stroke length
of 35cm. the centre of the pump is 3m above the water surface in the pump. The
atmospheric pressure head is 10.3 m of water and the pump is running at 35 r.p.m. if
the length and diameter of the delivery pipe is 30m and 10cm respectively and water is
delivered by the pump to a tank which is 20 m above the centre of the pump.
Determine i) pressure head due to the acceleration at the beginning of the suction
stroke,
ii) Maximum pressure head due to acceleration,
iii) Pressure head in the cylinder at the beginning and at the end of the stroke,
iv) Pressure head in the cylinder at the beginning of the delivery stroke.
Explain the parts, construction and working principle of Kaplan turbine.
Find the power required to drive a centrifugal pump which delivers 0.4m*/s of water to
a height of 20 m through a 15 cm diameter pipe and 100 m long. The overall
efficiency of the pump is 70% and co-efficient of friction f = 0.15 in the formula ‏بط)‎ =
4fLV7/d2g).
A four-stage centrifugal pump has four identical propellers, keyed to the same shaft.
The shaft is running at 400 r.p.m. and the total manometric head developed by the
multistage pump is 40m. The discharge through the pump is 0.2 077/6, the vanes of
each impeller are having outlet angle as 45 degrees. If the width and diameter of each

impeller at outlet 15 50173 and 60cm respectively. Find the manometric efficiency.
ಶೇ ೫ ೫ ‏اد‎

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