Categories: Second Year Second Semester (2-2)

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)

1 of 1

SET – 1

R13

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