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Reg No.: Name:

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
FOURTH SEMESTER B.TECH DEGREE EXAMINATION, APRIL 2018

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

Max. Marks: 100 Duration: 3 Hours
PARTA
Answer any two full questions, each carries 15 marks. Marks
1 a) Explain the functions of draft tube. (4) b) List down the classification of
turbines. (3)

c) A jet of water 75 mm diameter having a velocity of 20 m/s strikes normally a flat (8)
smooth plate. Determine the thrust on the plate if: i) if the plate is at rest ii) if the plate is
moving in the same direction as the jet with a velocity of 5 m/s. Also find the work done
per second on the plate in each case and the efficiency of jet when the plate is moving

2 a) What do you mean by specific speed of a centrifugal pump? (3) b) Obtain an
expression for minimum speed to start a centrifugal pump. (8)

c) Explain cavitation in centrifugal pump. (4)

3 a) Derive an expression for hydraulic efficiency of a Pelton wheel. (7) b) A centrifugal pump
having outer diameter equal to two times the inner diameter (8)

andrunning at 1200 rpm works against a total head of 48m. The velocity of flow

through theimpeller is constant and equal to 3m/s. The vanes are set back at an angle

of 40° atoutlet. If the outer diameter of the impeller is 500 mm and width at outlet

is 50mm,determine the vane angle at inlet, work done by impeller on water per

second andmanometric efficiency.

PART B
Answer any two full questions, each carries 15 marks.

4 a) Define Conveyance of a channel section. (2) b) Write a short note on velocity distribution
in open channels. (5)
c) Acircular drainage pipe 0.8m in diameter conveys a discharge at adepth of 0.3m. (8)
If the pipe is laid on a slope of 1 in 1000, estimate the discharge. N=0.02.

5 a) Define section factor for critical flow. (3)
b) What are the applications of hydraulic jump? (4)
c) Obtain an expression for energy loss due to a hydraulic jump in horizontal rectangular (8)
channels.
6 a) Prove that the most economical trapezoidal section is a half hexagon. (7)
b) A 3m wide rectangular channel carries a total discharge of 12 m?/s. Calculate: (8)
i) the critical depth ii) the minimum specific energy

iii) the alternate depths when E = 4 m.

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