Jawaharlal Nehru Technological University Kakinada 2008 B.Tech Electrical and Electronics Engineering FLUID MECHANICS AND HYDRAULIC MACHINERY - Question Paper

(b) Sketch and define a modern method of regulation to maintain a constant
speed for either
i. Pelton wheel or
ii. Francis turbine. [8+8]
8. (a) De?ne indicator diagram. How will you prove that area of indicator diagram
is proportional to the work done by the reciprocating pump?
(b) A centrifugal pump impeller whose external and internal diameters are 400 mm
and 200 mm respectively is running at 950 r.p.m. The rate of ?ow through the
pump is 0.035 m3
/s. the suction and delivery heads are five m 25 m respectively.
The diameters of the suction and delivery pipes are 120 mm and 80 mm
respectively. If the outlet vane angle is 450
, the ?ow velocity is constant and
equal to 1.8 m/s and power needed to drive the pump is 15 kW, determine:
i. Inlet vane angle
ii. The overall e?ciency, and
iii. The manometric e?ciency. [8+8]
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2 of 2Code No: 07A3EC02 Set No. 3
II B.Tech I Semester Regular Examinations, November 2008
FLUID MECHANICS AND HYDRAULIC MACHINERY
( Common to Electrical & Electronic Engineering and Production
Engineering)
Time: three hours Max Marks: 80
ans any 5 ques.
All ques. carry equal marks
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1. (a) elaborate the absolute and kinematic viscosities? Derive the equations for
them. explain what factors will in?uence them.
(b) Estimate the pressure inside a water droplet of size of 0.3mm. presume s=0.073N/m.
[10+6]
2. (a) What is the criteria to distinguish rotational ?ow from irrotational ?ow?
(b) Determine whether the ?owing velocity components satisfy the continuity
equation.
i. u = A sin xy, v = -A sin xy
ii. u = x + y, v = x - y. [6+10]
3. (a) Di?erentiate ranging from stagnation pressure head and static pressure head with
reference to a pitot tube. discuss with the help of a neat sketch.
(b) A venturimeter of throat diameter 5cm is ?tted into a 12.5 cm diameter water
pipe line. The coe?cient of discharge is 0.96. compute the ?ow in the pipe line
when the studying on a mercury water di?erential U tube manometer connected
to the upstream and throat parts indicates a studying of 20 cm. [6+10]
4. (a) A 15 cm diameter jet of water strikes a curved vane with a velocity of 40m/sec.

Earning:   Approval pending.