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

and is equal to 1.8 m/s. Determine:
i. Discharge through the runner, and
ii. Width at outlet if the width at inlet = 20 cm [16]
7. (a) provide the range of speci?c speed values of the Kaplan, Francis turbines and
Pelton wheels. What factors decide whether Kaplan, Francis, or a Pelton kind
turbine would be used in a hydroelectric project ?
(b) A Kaplan turbine working under a head of 25 m develops 16000 kW shaft
power. The outer diameter of the runner is four m and hub diameter is two m. The
guide blade angle is 35. The hydraulic and overall e?ciency are 90% and 85%
respectively. If the velocity of whirl is zero at outlet, determine: (i) runner
vane angles at inlet and outlet, and speed of turbine. [8+8]
8. (a) What do you understand by characteristic curves of a pump? What is the
signi?cance of the characteristic curves? discuss them in detail.
(b) The diameter of a centrifugal pump, which is discharging 0.035 m3
/s of water
against a total head of 25 m is 0.05m. The pump is running at 1200 r.p.m.
obtain the head, discharge and ratio of powers of a geometrically similar pump
of diameter 0.3 m when it is running at 2000 r.p.m. [8+8]
? ? ? ? ?





2 of 2Code No: 07A3EC02 Set No. 2
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
? ? ? ? ?
1. (a) What is the principle on which a peizometer works? Draw a neat sketch and
explain. elaborate di?erent kinds of the same?
(b) If the surface tension at the soap air interface is 0.088N/m, compute the
internal pressure in a soap bubble of three cm diameter. [10+6]
2. (a) What is the criteria to distinguish laminar ?ow from turbulent ?ow?
(b) Determine whether the subsequent velocity components satisfy the continuity
equation.
i. u = cx, v = -cy
ii. u = -cx/y, v = c log xy. [6+10]
3. (a) Draw neat sketches of total energy line and hydraulic gradient line for the
subsequent cases and discuss:
i. Uniform diameter parallel pipe line
ii. Parallel converging pipe line
iii. Parallel diverging pipe line.

Earning:   Approval pending.