Download GTU (Gujarat Technological University Ahmedabad) B.Tech/BE (Bachelor of Technology/ Bachelor of Engineering) 2020 Summer 6th Sem 2160602 Applied Fluid Mechanics Previous Question Paper
Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER? VI EXAMINATION ? SUMMER 2020
Subject Code: 2160602 Date:27/10/2020
Subject Name: APPLIED FLUID MECHANICS
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Draw sketch wherever necessary
4. Figures to the right indicate full marks
Q.1
(a) Determine the dimensions of : dynamic viscosity, torque and angular velocity
03
(b) Enlist the forces acting on fluied in motion
04
(c) Explain with diagrams how the main charecteristic curves for pumps are obtained 07
and how they are useful in pump selection.
Q.2
(a) Define : eddy viscosity, prandattl's mixing length, and shear velocity
03
(b) Give reasons why the expansion transition length in pipes are kept greater in 04
comparison to contraction transition length.
(c) Expalin the Reynolds experiment for pipe flow with the help of sketch of the 07
experimental set up and graph between head loss and Reynolds Number
OR
(c) Explain with diagram the specific energy curve for different discahrges and develop 07
the expression for the minimum specific energy and state the charecteristics of flow
in the critical state.
Q.3
(a) Differentiate between drawdown and back water curve of GVF giving examples 03
where they occur
(b) Discuss the utility of hydraulic jump
04
(c) A partially open sluice gate discharges water at 10 m/s with a depth of 50 cm in the 07
horizontal rectnagular channel of width 10 meter.Find the pre hydraulic jmp Froude
number and the height of the hydraulic jump that will occur under the given
conditions.
OR
Q.3
(a) State the assumptions made in the development of dynamic equation of gradually 03
varied flow.
(b) .Develop the relationship between Maning's "n" and Chezy's "C" used for uniform 04
steady flow
(c) Calculate the
specific energy, critical depth and velocity for the flow of 10 m3/s in a 07
lined rectangular channel 2.5 meter wide with 2m depth of water. Find whether the
flow is in sub critical or super critical state.
Q.4
(a) Define developing and developed flow
03
(b) Explain why the development length for turbulent flow is much less compared to the 04
development length required for a laminar flow.
(c) With the help of neat sketch describe the development of bounday layer over a flat 07
plate.
OR
Q.4
(a) Define and expalin the significance of laminar sub layer
03
(b) Define the concept of displacement thickness and develop an expression for the 04
same.
1
(c) Discuss the means of separation control for flow past an aerofoil, around a pipe bend 07
and flow around a sphere
Q.5
(a) Explain the principle of dimensional homogenity. Give an example each of 03
dimensionally homogeneous and non homogeneous equation.
(b) Define distotrted and undistorted models and give their utility
04
(c) A 10 cm diameter plate is to be rotated in water and a 25 cm diameter plate is to be 07
rotated in air under dynamically similar conditions. Find the ratios of the torques
required given that mass density of water and air respectively are 1000 kg/ m3 / and
1.2 kg /m3, dynamic viscosity of water and air are 0.001 Ns/m2 and 1.8x 10-6 Ns/m2
respectively.
OR
Q.5
(a) Discuss the circumstances under which the pumps will be connected in series or 03
parallel. Explain the resultant head and discahrges in the two cases
(b) Explain the scale effect in models
04
(c) In a 1:20 model of a stilling basin the height of the hydraulic jump and the energy 07
dissipated in the model is 0.2 meter and 0.1 kilowatt respectively, find the
corresponding values in the prototype.
.
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This post was last modified on 04 March 2021