Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2018 Winter 5th Sem New 2152003 Fluid Mechanics And Machines Previous Question Paper
1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?V (NEW) EXAMINATION ? WINTER 2018
Subject Code:2152003 Date:16/11/2018
Subject Name:Fluid Mechanics & Machines
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.
MARKS
Q.1 (a) Differentiate between Newtonian ? Non Newtonian fluid. 03
(b) Write short note on vapour pressure. 04
(c) Derive Euler?s equation of motion for flow along a stream line. 07
Q.2 (a) Define atmospheric pressure. Enlist different types of pressures. 03
(b) State Pascal?s law of pressure and prove it. 04
(c) A rectangular plane surface 3 m wide and 4 m deep lies in water in
such a way that its plane makes an angle of 30? with the free surface.
Determine the total pressure force and position of centre of pressure,
when upper edge is 2 m below the free surface.
07
OR
(c) A block of wood of specific gravity 0.7 floats in water. Determine the
meta-centric height of the block if its size is 2 m ? 1 m ? 0.8 m
07
Q.3 (a) Explain with sketch stable and neutral equilibrium of floating body. 03
(b) The velocity components in a two dimensional flow are
?? =
?? 3
3
+ 2?? ? ?? 2
?? ?????? ?? = ?? ?? 2
? 2?? ?
?? 3
3
Show that these components represent a possible case of an
irrotational flow.
04
(c) Derive continuity equation for three dimensional incompressible flow
and reduce the same equation to 1D steady incompressible flow.
07
OR
Q.3 (a) Explain the meaning of each term of Bernoulli?s equation. 03
(b) Write short note on Compressibility and Bulk Modulus of Elasticity 04
(c) Water is flowing through a pipe having diameter of 300 mm and 200
mm at the bottom and upper end respectively. The intensity of pressure
at the bottom end is 24.525 N/cm
2
and the pressure at the upper end is
9.81 N/cm
2
. Determine the difference in datum head is the rate of flow
through pipe is 40 lit/s.
07
Q.4 (a) Write short note on boundary layer separation. 03
(b) Explain Minor loss in pipe flow. 04
(c) A plate of 600 mm length and 400 mm wide is immersed in a fluid of
sp. gravity 0.9 and kinematic viscosity 10
?4
m
2
/s. The fluid is moving
with a velocity of 6 m/s. Calculate
a. The boundary layer thickness
b. Drag force on one side of the plate
07
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1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?V (NEW) EXAMINATION ? WINTER 2018
Subject Code:2152003 Date:16/11/2018
Subject Name:Fluid Mechanics & Machines
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.
MARKS
Q.1 (a) Differentiate between Newtonian ? Non Newtonian fluid. 03
(b) Write short note on vapour pressure. 04
(c) Derive Euler?s equation of motion for flow along a stream line. 07
Q.2 (a) Define atmospheric pressure. Enlist different types of pressures. 03
(b) State Pascal?s law of pressure and prove it. 04
(c) A rectangular plane surface 3 m wide and 4 m deep lies in water in
such a way that its plane makes an angle of 30? with the free surface.
Determine the total pressure force and position of centre of pressure,
when upper edge is 2 m below the free surface.
07
OR
(c) A block of wood of specific gravity 0.7 floats in water. Determine the
meta-centric height of the block if its size is 2 m ? 1 m ? 0.8 m
07
Q.3 (a) Explain with sketch stable and neutral equilibrium of floating body. 03
(b) The velocity components in a two dimensional flow are
?? =
?? 3
3
+ 2?? ? ?? 2
?? ?????? ?? = ?? ?? 2
? 2?? ?
?? 3
3
Show that these components represent a possible case of an
irrotational flow.
04
(c) Derive continuity equation for three dimensional incompressible flow
and reduce the same equation to 1D steady incompressible flow.
07
OR
Q.3 (a) Explain the meaning of each term of Bernoulli?s equation. 03
(b) Write short note on Compressibility and Bulk Modulus of Elasticity 04
(c) Water is flowing through a pipe having diameter of 300 mm and 200
mm at the bottom and upper end respectively. The intensity of pressure
at the bottom end is 24.525 N/cm
2
and the pressure at the upper end is
9.81 N/cm
2
. Determine the difference in datum head is the rate of flow
through pipe is 40 lit/s.
07
Q.4 (a) Write short note on boundary layer separation. 03
(b) Explain Minor loss in pipe flow. 04
(c) A plate of 600 mm length and 400 mm wide is immersed in a fluid of
sp. gravity 0.9 and kinematic viscosity 10
?4
m
2
/s. The fluid is moving
with a velocity of 6 m/s. Calculate
a. The boundary layer thickness
b. Drag force on one side of the plate
07
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2
c. Shear stress at end of the plate
OR
Q.4 (a) What is Reynolds number ? State its physical significance. 03
(b) State the main components of centrifugal pump. 04
(c) Derive Hagen Poiseuille?s equation. 07
Q.5 (a) Explain positive displacement pump. 03
(b) What is priming? Explain any one method of priming. 04
(c) A turbine is to operate under a head of 25 m at 200 rpm. The discharge
is 9 m
3
/s. If the efficiency is 90%, determine
a. Specific speed of machine
b. Power generated
c. Type of turbine
07
OR
Q.5 (a) What are functions of air vessels in reciprocating pump? Where they
are located?
03
(b) Explain difference between impulse and reaction turbine. 04
(c) The diameter of a centrifugal pump which is discharging 0.03 m
3
/s of
water against a total head of 20 m is 0.40 m. The pump is running at
1500 rpm. Find the head, discharge and ratio of powers of
geometrically similar pump of diameter 0.25 m when it is running at
3000 rpm.
07
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This post was last modified on 20 February 2020