Download GTU (Gujarat Technological University Ahmedabad) B.Tech/BE (Bachelor of Technology/ Bachelor of Engineering) 2020 Winter 5th Sem 3152003 Fluid Mechanics And Machines Previous Question Paper
Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER?V (NEW) EXAMINATION ? WINTER 2020
Subject Code:3152003 Date:03/02/2021
Subject Name:Fluid Mechanics & Machines
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) Explain the following terms: Specific Density, Viscosity, Surface tension.
03
(b) State & Prove Pascal's Law.
04
(c) What is Meta-Center? Derive equation for Meta-Centric height of floating body.
07
Q.2 (a) Give differences between following (i) Kinematic viscosity and Dynamic
03
Viscosity. (ii) Cohesion and Adhesion
(b) Define The Capillary Effect & Derive The Equation for Capillary rise & Fall
04
with sketch
(c) What is Continuity Equation? Derive Continuity Equation for three dimensions.
07
Q.3 (a) What do you understand by laminar flow and turbulent flow?
03
(b) Obtain the equation to the stream lines for the velocity field given as: V
04
= 2x3 i ? 6x2 y j
(c) Derive expressions for total force and centre of pressure on a vertical plane
07
surface submerged in static liquid.
Q.4 (a) Explain Archimedes principle.
03
(b) Describe the types of fluid flow. Explain Stream-lines and Path-lines.
04
(c) State and derive Bernoulli's theorem, state its application and assumptions
07
made.
Q.5 (a) Explain boundary layer theory.
03
(b) What is priming of centrifugal pump? Explain clearly why priming is essential
04
before starting a centrifugal pump
(c) Derive Darcy ? Weisbach equation for the loss of head due to friction in pipes
07
Q.6 (a) What is Draft-Tube? Give types of Draft-Tubes.
03
(b) Explain function of components of Pelton turbine.
04
(c) A Pelton wheel is to be designed for a head of 60 m when running at 200 r.p.m.
07
The pelton wheel develops 95.6475 kW shaft power. The velocity of the
buckets=0.45 times the velocity of the jet, overall efficiency=0.85 and co-
efficient of the velocity is equal to 0.98.
Q.7 (a) What is compressibility? Derive an expression for it?
03
(b) Compare the centrifugal pumps with reciprocating pumps.
04
(c) A centrifugal pump is to discharge 0.118 m3 /s at a speed of 1450 r.p.m against
07
a head of 25 m. The impeller diameter is 250 mm, its width at outlet is 50 mm
and manometric efficiency is 75%.determine the vane angle at the outer
periphery of the impeller.
1
Q.8 (a) Differentiate clearly between Impulse turbine and Reaction turbine.
03
(b) Write short note on air vessel.
04
(c) Define Specific speed of a centrifugal pump & derive the expression for the
07
same.
*************
2
This post was last modified on 04 March 2021