Download GTU B.Tech 2020 Summer 4th Sem 3140611 Fluid Mechanics And Hydraulics Question Paper

Download GTU (Gujarat Technological University Ahmedabad) B.Tech/BE (Bachelor of Technology/ Bachelor of Engineering) 2020 Summer 4th Sem 3140611 Fluid Mechanics And Hydraulics Previous Question Paper

Seat No.: ________
Enrolment No.___________


GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER? IV EXAMINATION ? SUMMER 2020
Subject Code: 3140611 Date:04/11/2020
Subject Name: Fluid Mechanics & Hydraulics
Time: 10:30 AM TO 01:00 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 density, specific volume & surface tension.
03

(b) The velocity distribution for flow over a flat plate is given by
04


u = 0.75 y - y2 in which u is the velocity in metre per second at a



distance y metre above the plate. Determine the shear stress at



y = 0.20 m. Take dynamic viscosity of fluid as 8.0 poise.


(c) u=
Ex 3/4
plain the phenomenon of capillarity.Obtain an expression for
07


capillary rise of a liquid.
Q.2 (a) Define atmospheric, absolute & vaccum pressure.
03

(b) Explain hydrostatic paradox.
04

(c) Write short note on manometers.
07


OR


(c) State & prove Pascal's law.
07
Q.3 (a) Define total pressure, centre of pressure & buoyancy.
03

(b) A rectangular plane surface is immersed vertically in water such that
04
its upper edge is touching free surface of liquid. Show that the depth
of centre of pressure is 2/3 d for rectangular surface of width b and
depth d.

(c) Define metacentre & metacentric height. How will you determine
07
metacentric height of a floating body experimentally? Explain with
neat sketch.


OR

Q.3 (a) Define stream lines, streak lines & flow net.
03

(b) Differentiate between (i) Uniform & non uniform flow (ii) Sub
04
critical & super critical flow.

(c) State & prove Bernoulli's equation & write assumption made for
07
such a derivation.
Q.4 (a) Define
orifice, mouthpiiece & notches.
03

(b) Find the discharge of water flowing over a rectangular notch of 2.0
04
m length when the constant head over the notch is 500 mm.Take Cd
= 0.62

(c) Differrentiate between small & large orifice.Obtain an expression
07
for discharge through large orifice.

OR

Q.4 (a) Define major energy losses in pipe, hydraulic gradient line & total
03
energy line.

(b) Three pipes of lengths 800 m, 500 m and 400 m and of diameters
04
500 mm, 400 mm & 300 mm respectively are connected in series.
These pipes are to be replaced by a single pipe of length 1700 m.
Find the diameter of the single pipe.

(c) Define viscous flow. Derive expression for Hagen-Poiseuille's
07
formula.
1

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Q.5 (a) Define turbulent flow in open channel, specific energy curve &
03
hydraulic jump.


(b) A sluice get discharges water into a horizontal rectangular channel
04
with a velocity of 10 m/sec & depth of flow of 1 m.Determine the
depth of flow after the jump & consequent losses in total head.

(c) Define gradually varied flow. Derive equation of gradually varied
07
flow.


OR
Q.5 (a) Define dimensional homogeneity, similitude & undistorted models
03
(b) Explain method of selecting repeating variables.
04
(c) The pressure difference p in a pipe of diameter D and length l due
07
to viscous flow depends on the velocity V, viscosity & density .
Using Buckingham's theorem obtain an expression for p.
2

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