Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Summer 5th Sem New 2152003 Fluid Mechanics And Machines Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?V (NEW) EXAMINATION ? SUMMER 2019
Subject Code: 2152003 Date: 31/05/2019
Subject Name: Fluid Mechanics & Machines
Time: 02:30 PM TO 05:00 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) What is capillarity? Derive expression for height of capillary rise. 03
(b) Describe the terms atmospheric, absolute, gauge and vacuum pressure
with neat sketch.
04
(c) An isosceles triangular lamina of base 3m and altitude 3m is
immersed vertically in an oil of specific gravity 0.8 with its axis of
symmetry horizontal. If the depth of oil on the axis of symmetry is
5m, Determine the total pressure and center of pressure.
07
Q.2 (a) What is the difference between dynamic viscosity and kinematic
viscosity? State their units.
03
(b) Obtain the equation to the stream lines for the velocity field given as:
V = 2x
3
i ? 6x
2
yj
04
(c) Derive expressions for total force and centre of pressure on a vertical
plane surface submerged in static liquid.
07
OR
(c) Derive Darcy-Weisbach equation for the loss of head due to friction
in pipes.
07
Q.3 (a) Find the displacement thickness for the velocity distribution in the
boundary layer is given by
?? ?? =
?? ?? , where u is the velocity at a
distance y from the plate and u = U at y = ?, where ? = boundary
layer thickness.
03
(b) State and prove Pascal?s law. 04
(c) What is Continuity Equation? Derive Continuity Equation for three
dimensions.
07
OR
Q.3 (a) Enlist different forces present in a fluid flow. For the Euler?s equation
of motion which forces are taken into consideration?
03
(b) Explain following terms: Net positive suction head, Priming. 04
(c) Describe the types of fluid flow. Explain Stream-lines, Path-lines and
Streak- lines.
07
Q.4 (a) Define the following terms: 03
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Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?V (NEW) EXAMINATION ? SUMMER 2019
Subject Code: 2152003 Date: 31/05/2019
Subject Name: Fluid Mechanics & Machines
Time: 02:30 PM TO 05:00 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) What is capillarity? Derive expression for height of capillary rise. 03
(b) Describe the terms atmospheric, absolute, gauge and vacuum pressure
with neat sketch.
04
(c) An isosceles triangular lamina of base 3m and altitude 3m is
immersed vertically in an oil of specific gravity 0.8 with its axis of
symmetry horizontal. If the depth of oil on the axis of symmetry is
5m, Determine the total pressure and center of pressure.
07
Q.2 (a) What is the difference between dynamic viscosity and kinematic
viscosity? State their units.
03
(b) Obtain the equation to the stream lines for the velocity field given as:
V = 2x
3
i ? 6x
2
yj
04
(c) Derive expressions for total force and centre of pressure on a vertical
plane surface submerged in static liquid.
07
OR
(c) Derive Darcy-Weisbach equation for the loss of head due to friction
in pipes.
07
Q.3 (a) Find the displacement thickness for the velocity distribution in the
boundary layer is given by
?? ?? =
?? ?? , where u is the velocity at a
distance y from the plate and u = U at y = ?, where ? = boundary
layer thickness.
03
(b) State and prove Pascal?s law. 04
(c) What is Continuity Equation? Derive Continuity Equation for three
dimensions.
07
OR
Q.3 (a) Enlist different forces present in a fluid flow. For the Euler?s equation
of motion which forces are taken into consideration?
03
(b) Explain following terms: Net positive suction head, Priming. 04
(c) Describe the types of fluid flow. Explain Stream-lines, Path-lines and
Streak- lines.
07
Q.4 (a) Define the following terms: 03
2
Boundary layer thickness, Laminar sub-layer, Drag
(b) State and derive moment of momentum equation. 04
(c) State and derive Bernoulli?s theorem, state its application and
assumptions made.
07
OR
Q.4 (a) Explain Archimedes?s principle 03
(b) Compare Reciprocating pump and Centrifugal pump. 04
(c) A Pelton wheel is to be designed for the following specifications:
Shaft power = 11,772 kW, Head = 380 m, Speed = 750 r.p.m.,
Overall efficiency = 86%, Jet diameter is not to exceed one-sixth of
the wheel diameter. Determine: (i) The wheel diameter, (ii) The
number of jets required, and (iii) Diameter of the jet. Take Kv1=
0.985 and Ku1= 0.45
07
Q.5 (a) How hydraulic turbines are classified? 03
(b) What is the function of air vessels in Reciprocating pump? 04
(c) A centrifugal pump is to discharge 0.118 m3/s at a speed of 1450
r.p.m against 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.
07
OR
Q.5 (a) Differentiate clearly between Impulse turbine and Reaction turbine. 03
(b) State function of draft tube and explain with neat sketch any two type
of draft tubes.
04
(c) Define Specific speed of a centrifugal pump & derive the expression
for the same.
07
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This post was last modified on 20 February 2020