JNTU Kakinada B-Tech 2-1 R1621016 FLUID MECHANICS R16 May 2018 Question Paper

Code No: R1621016
II B. Tech I Semester Supplementary Examinations, May – 2018
FLUID MECHANICS (Civil Engineering)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 FOUR Questions from Part-B
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
PART ?A
1. a)Define specific volume and specific gravity of a fluid.
b)What is center of pressure?
c)What are the applications of momentum equation?
d)Differentiate smooth and rough flows.
e)Define Vena-contracta
f)Define drag and lift force of an object immersed in a liquid.
PART -B
2. a) Calculate specific weight, density and specific gravity of two liters of a liquid
which weigh 15 N.
b) Define pressure. Obtain an expression for the pressure intensity at a point in a
fluid.
3. a) Differentiate between: (i) Steady and Unsteady flow (ii) Uniform and non uniform flow (iii)Laminar and turbulent flow (iv) Rotational and irrotational flow
b) Derive the equation of continuity for one dimensional flow of an incompressible
fluid.
4. a) Write Euler?s equation of motion long a streamline and integrate it to obtain
Bernoulli?s equation. State all assumptions made.
b) What are the surface and body forces associated with fluid flow? How are they
incorporated in Euler?s equation?
5. a)What are hydraulic grade line and total energy line? How do you draw the same?
b)What do you mean by pipe in series and pipes in parallel?
6. a) Define velocity of approach. How can you account for it while computing the
discharge over weirs?
b) A pitot-tube is inserted in a pipe of 300mm diameter. The static pressure in pipe is
100mm of mercury (vacuum). The stagnation pressure at the center of the pipe,
recorded by the pitot tube is 0.981N/cm
2
. Calculate the rate of flow of water
through pipe, if the mean velocity of flow is 0.85 times the central velocity. Take
C
v
=0.98.

1 of 2

SET – 1
R16

Code No: R1621016
II B. Tech I Semester Supplementary Examinations, May – 2018
FLUID MECHANICS (Civil Engineering)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 FOUR Questions from Part-B
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
PART ?A
1. a)Define specific volume and specific gravity of a fluid.
b)What is center of pressure?
c)What are the applications of momentum equation?
d)Differentiate smooth and rough flows.
e)Define Vena-contracta
f)Define drag and lift force of an object immersed in a liquid.
PART -B
2. a) Calculate specific weight, density and specific gravity of two liters of a liquid
which weigh 15 N.
b) Define pressure. Obtain an expression for the pressure intensity at a point in a
fluid.
3. a) Differentiate between: (i) Steady and Unsteady flow (ii) Uniform and non uniform flow (iii)Laminar and turbulent flow (iv) Rotational and irrotational flow
b) Derive the equation of continuity for one dimensional flow of an incompressible
fluid.
4. a) Write Euler?s equation of motion long a streamline and integrate it to obtain
Bernoulli?s equation. State all assumptions made.
b) What are the surface and body forces associated with fluid flow? How are they
incorporated in Euler?s equation?
5. a)What are hydraulic grade line and total energy line? How do you draw the same?
b)What do you mean by pipe in series and pipes in parallel?
6. a) Define velocity of approach. How can you account for it while computing the
discharge over weirs?
b) A pitot-tube is inserted in a pipe of 300mm diameter. The static pressure in pipe is
100mm of mercury (vacuum). The stagnation pressure at the center of the pipe,
recorded by the pitot tube is 0.981N/cm
2
. Calculate the rate of flow of water
through pipe, if the mean velocity of flow is 0.85 times the central velocity. Take
C
v
=0.98.

1 of 2

SET – 1
R16

Code No: R1621016

7. a) Define boundary layer and explain the fundamental causes of its existence. Also
discuss the various methods of controlling the boundary layer.
b) It is required to determine the frictional drag of a submarine. The length of the hull
is 75m and its surface area is 3000m
2
. The submarine is travelling at a constant
speed of 5m/s. critical Reynolds number at which the flow in the boundary layer
changes from laminar to turbulent is 5 x 10
5
. Assuming that the boundary layer at
the leading edge is laminar, obtain the frictional drag and the power required to
propel the submarine at 5m/s. take =1 x 10
-6
m
2
/s and =1000kg/m
3
.

2 of 2
SET – 1
R16