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Reg No.:_ Name:

FOURTH SEMESTER B.TECH DEGREE EXAMINATION(S), DECEMBER 2019

Max. Marks: 100

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1192056 Pages:2

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY

Course Code: CE206
Course Name: FLUID MECHANICS II

Assume any missing data suitably.
PARTA
Answer any two full questions, each carries 15 marks.
A Pelton wheel working under a head of 800 m develops 15 MW running at 600 rpm

with an overall efficiency of 85%. The ratio of wheel diameter to jet diameter is 15, the
coefficient of velocity for the nozzle is 0.97 and the speed ratio is 0.46. Determine the
rate of flow, diameter of wheel and number of jets.
A jet of water having a velocity of 40 m/s strikes a curved vane, which is moving with a
velocity of 20 m/s. The jet makes an angle of 30° with the direction of motion of vane at
inlet and leaves at an angle of 90° to the direction of motion of vane at outlet. Determine
the vane angles at inlet and outlet so that the water enters and leaves the vane without
shock.
A Francis turbine is running at 400 rpm when head available is 60 ൩. The inner and
outer diameters are 50 cm and 100 cm respectively. The constant velocity of flow
through the runner is 10 m/s and hydraulic efficiency is 80%. Determine the inlet and
outlet runner blade angles.
What are the functions of a draft tube?
Define specific speed of a centrifugal pump.
Define the terms: i) suction head, ii) delivery head, iii) static head, and iv) manometric
head.
Why priming is necessary in centrifugal pumps?
The impeller of a centrifugal pump has an external diameter of 300 mm and internal
diameter of 150 mm and it runs at 1200 rpm. The vanes at exit are set back at an angle
of 30°. If the velocity of flow is constant at 2 m/s, determine: i) the blade angle at the
inlet, ii) the velocity and direction of water at outlet and iii) the head developed if
manometric efficiency is 0.85.
PART B

Answer any two full questions, each carries 15 marks.

Derive Chezy’s equation for uniform flow in open channel.

It is required to convey 10 m*/s of water at a mean velocity of 1.25 m/s. Calculate the
dimensions of the most efficient section of the channel whose shape is a) rectangular and

b) trapezoidal channel of side slope 1/3

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Duration: 3 Hours

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