JNTU Kakinada B-Tech 2-2 RT22034 FLUID MECHANICS AND HYDRALIC MACHINERY R13 April 2018 Question Paper

Code No: RT22034
II B. Tech II Semester Supplementary Examinations, April-2018
FLUID MECHANICS AND HYDRALIC MACHINERY (Com. to ME, AME)Time: 3 hours Max. Marks: 70
Note: 1. Question Paper consists of two parts (Part-A and Part-B) 2. Answer ALL the question in Part-A
3. Answer any THREE Questions from Part-B
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
PART-A
1. a) Explain the effect of temperature and pressure on viscosity.
b) Differentiate between rotational and irrotational flows.
c) Briefly explain the characteristics of turbulent boundary layer.
d) How does a volute casing differ from a vortex casing for the centrifugal pump?
e) Why does a Pelton wheel not possess any draft tube? (4M+4M+6M+4M+4M)
PART-B
2. a) What is the disadvantage in having very high meta-centric heights for passenger ships?
Explain.
b) A rectangular plate 0.7 m wide and 1.6 m deep is submerged in water in an inclined position.
The maximum and minimum depths of the plate are 1.8 m and 0.8 m from the free surface.
Calculate the hydrostatic force on one face of the plate, and the depth of centre of pressure. (7M+9M)
3. a) State the assumptions made while deriving Darcy Weisbach equation.
b) For steady incompressible flow verify whether the following values of u and v are possible:
i) u = 6xy +2 y
2
, v = 7xy + 5x ii) u = x
2
+ y
2
, v = -4xy
iii) u = -2x/ (x
2
+ y
2
), v = -2y/(x
2
+ y
2
). (6M+10M)
4. The velocity profile for laminar boundary layer flow is given as u/U = 4(y/d) ? 2 (y/d)
2
. Find
an expression for boundary layer thickness and shear stress. (16M)
5. The jet velocity in a Pelton turbine is 70 m/s. The peripheral velocity of the runner is 30 m/s.
The jet is deflected by 140? by the bucket. Determine the work done, power developed and
hydraulic efficiency of the turbine for a flow rate of 0.9 m
3
/s. The blade friction coefficient is
0.85. (16M)
6. Write short notes on
a) Impellers b) Centrifugal pump characteristics (8M+8M)
7. a) Why is the end of a draft tube immersed below the tail water level? Explain with a neat
sketch. De?ne draft tube e?ciency and derive its equation.
b) Explain the working, advantages, limitations and applications of hydraulic ram. (8M+8M)

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