Download GTU (Gujarat Technological University Ahmedabad) B.Tech/BE (Bachelor of Technology/ Bachelor of Engineering) 2020 Winter 5th Sem 3153515 Elements Of Fluid Mechanics Previous Question Paper
Seat No.: ________
Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER?V (NEW) EXAMINATION ? WINTER 2020
Subject Code:3153515 Date:22/01/2021
Subject Name:Elements of Fluid Mechanics
Time:10:30 AM TO 12:30 PM Total Marks: 56
Instructions:
1. Attempt any FOUR questions out of EIGHT questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
MARKS
Q.1 (a) (i)What is the basic difference between Mixing and Agitation?
03
(ii)Define: Kinematic viscosity
(iii)What is Co-efficient of drag?
(b) Differentiate Between Centrifugal pump and positive displacement
04
pump.
(c) Explain Fluidization operation with suitable diagram of pressure
07
drop and bed height versus superficial velocity for a bed of solid.
Q.2 (a) What is cavitation in pump and how it can be prevented?
03
(b) List out Properties of the fluid and explain any two in detail.
04
(c) Write the three representational forms of Bernoulli's equation
07
relating to flow of fluid between two points in an incompressible
fluid.
Q.3 (a) Give a brief note on Commercial Applications of fluidized bed
03
(b) What is vortex formation and how it can be prevented?
04
(c) Derive Hagen Poiseull's equation for the flow of incompressible
07
fluid in laminar regime through a pipe.
Q.4 (a) Define:
03
(i)Drag
(ii)Power No.
(iii) Hydraulically smooth pipe
(b) Explain about flow pattern generated during mixing?
04
(c) The oil is flowing through a pipe of 80 mm in diameter under a gauge
07
pressure of 100 kPa, and with a mean velocity of 2.5 m/s. The specific
gravity of oil is 0.85. Neglecting friction, find the total head, if pipe
is above the datum line.
Q.5 (a) Discuss difference between skin friction and form friction.
03
(b) Mention newton's law of viscosity. Give the classification of fluids
04
Based on Newton's law of viscosity.
(c) A horizontal venturimeter with inlet diameter 20 cm and throat
07
diameter 10 cm is used to measure flow of oil of specific gravity 0.8.
The discharge of oil through venturimeter is 60 liters/sec. Find the
reading of oil ? mercury differential manometer Cd = 0.98.
Q.6 (a) Explain how boundary layer separation takes place?
03
(b) Explain vapor pressure and its variation with temperature.
04
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(c) An orifice meter consisting of 100 mm in diameter orifice in a 250
07
mm diameter pipe has Cd= 0.65. The pipe delivers oil of specific
gravity of 0.8. The pressure difference on the two side of the orifice
plate is measured by a mercury oil differential manometer. If the
differential gauge reading is 800 mm of mercury, find the rate of flow
in liter/s.
Q.7 (a) What are the types of fluidization?
03
(b) Write a short note on different correction factors applied in Bernoulli's
04
equation for fluid flow in a practical situation.
(c) Explain Characteristic curves of the centrifugal pump
07
Q.8 (a) What is transition length? Mention its relation with Reynolds's
03
number for flow through a pipe.
(b) A circular disc of 2 m in diameter is held normal to a 30 m/s wind of
04
density 1.2 kg/m3. What is the drag force exerted by wind on this
disc? Assume co-efficient of drag for the disc is 1.2.
(c) With a neat and clean diagram explain the working principle of
07
rotameter.
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This post was last modified on 04 March 2021