Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Winter 6th Sem New 2160602 Applied Fluid Mechanics Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? VI (New) EXAMINATION ? WINTER 2019
Subject Code: 2160602 Date: 06/12/2019
Subject Name: Applied Fluid Mechanics
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 (a) Define: (i) Critical depth (ii) Total energy line (iii) Hydraulic
gradient line
03
(b) Describe water hammer phenomenon in pipes. 04
(c) Derive the Hagen-Poiseuille equation for laminar flow in the
circular pipe.
07
Q.2 (a) Define the most economical channel section. Derive the
condition for rectangular channel of best section
03
(b) Differentiate hydro-dynamically smooth and rough pipes. 04
(c) A horizontal pipe of diameter 450 mm is suddenly contracted
to diameter of 250 mm. The pressure intensity in larger and
smaller pipes are given as 14.5 N/cm
2
and 12.5 N/cm
2
. If Cc=
0.62 find loss of head due to sudden contraction and discharge
of water
07
OR
(c) Prove that Maximum Velocity is equal to one and half times
the average velocity for flow between fixed parallel plate.
07
Q.3 (a) Define and enlist types of draft tube with neat sketch 03
(b) What do you mean by pipes in series and pipes in parallel? How
the loss of head is determined in both systems.
04
(c) Explain boundary layer growth over a flat plate.Derive the
expression for momentum thickness of boundary layer flow.
07
OR
Q.3 (a) Write a note on prandtl mixing length theory 03
(b) Write a note on prevention of boundary layer separation 04
(c) Explain boundary layer theory and derive Karman?s
momentum equation for boundary layer.
07
Q.4 (a) Differentiate between back water curve and drop down curve. 03
(b) Derive Chezy?s formula to calculate the velocity in case of a
channel.
04
(c) A 6 meter wide channel conveys water at a depth of 2.15 m.
The bedslope of channel is 0.001. Find the width to be provided
in transition so as to obtain critical depth. Alternatively with
the same width of 6m, find the rise in the bedlevel required to
produce critical flow in channel. Take N= 0.018
07
OR
Q.4 (a) Define specific speed, unit discharge and unit power of turbine. 03
(b) Draw Specific energy curve and explain the terms, Critical
depth, alternate depths, sub critical and super critical flow
04
(c) Describe direct step method of calculating the length of back
water curve, also discuss the need for calculating the length of
back water curve.
07
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1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? VI (New) EXAMINATION ? WINTER 2019
Subject Code: 2160602 Date: 06/12/2019
Subject Name: Applied Fluid Mechanics
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 (a) Define: (i) Critical depth (ii) Total energy line (iii) Hydraulic
gradient line
03
(b) Describe water hammer phenomenon in pipes. 04
(c) Derive the Hagen-Poiseuille equation for laminar flow in the
circular pipe.
07
Q.2 (a) Define the most economical channel section. Derive the
condition for rectangular channel of best section
03
(b) Differentiate hydro-dynamically smooth and rough pipes. 04
(c) A horizontal pipe of diameter 450 mm is suddenly contracted
to diameter of 250 mm. The pressure intensity in larger and
smaller pipes are given as 14.5 N/cm
2
and 12.5 N/cm
2
. If Cc=
0.62 find loss of head due to sudden contraction and discharge
of water
07
OR
(c) Prove that Maximum Velocity is equal to one and half times
the average velocity for flow between fixed parallel plate.
07
Q.3 (a) Define and enlist types of draft tube with neat sketch 03
(b) What do you mean by pipes in series and pipes in parallel? How
the loss of head is determined in both systems.
04
(c) Explain boundary layer growth over a flat plate.Derive the
expression for momentum thickness of boundary layer flow.
07
OR
Q.3 (a) Write a note on prandtl mixing length theory 03
(b) Write a note on prevention of boundary layer separation 04
(c) Explain boundary layer theory and derive Karman?s
momentum equation for boundary layer.
07
Q.4 (a) Differentiate between back water curve and drop down curve. 03
(b) Derive Chezy?s formula to calculate the velocity in case of a
channel.
04
(c) A 6 meter wide channel conveys water at a depth of 2.15 m.
The bedslope of channel is 0.001. Find the width to be provided
in transition so as to obtain critical depth. Alternatively with
the same width of 6m, find the rise in the bedlevel required to
produce critical flow in channel. Take N= 0.018
07
OR
Q.4 (a) Define specific speed, unit discharge and unit power of turbine. 03
(b) Draw Specific energy curve and explain the terms, Critical
depth, alternate depths, sub critical and super critical flow
04
(c) Describe direct step method of calculating the length of back
water curve, also discuss the need for calculating the length of
back water curve.
07
2
Q.5 (a) Differentiate between a pump and the turbine. 03
(b) What are distorted and undistorted models? What are the
advantages of using distorted model?
04
(c) What is dimensional less number? State and explain them. 07
OR
Q.5 (a) Differentiate between Impulse and Reaction turbine. 03
(b) Two jet strikes the bucket of Pelton wheel which is having shaft
power of 16000 kW, the diameter of each jet is given as 200
mm. If the net head on the turbine is 200 m. Find the overall
efficiency of a turbine. Take Cv=1
04
(c) State and explain Buckingham?s ? theorem. Why it is
considered over Rayleigh method over dimensional analysis.
07
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This post was last modified on 20 February 2020