Amie winter 2017 mechanical engineering mechanics of fluid question paper.
Ieindia winter 2017 mechanics of fluid question paper.
W'17:5 FN MC 404 (1497)
MECHANICS OF FLUID
Time Three hours
Maximum Marks 100
Answer FIVE questions, taking ANY TWO from Group A,
ANY Two from Group B and ALL from Group C.
All parts of a question (a, b, etc. should be
answered at one place.
Answer should be brief and to-the-point and be supple
mented with neat sketches. Unnecessary long answer may
result in loss of marks.
Any missing or wrong data may be assumed suitably
giving proper justification.
Figures on the right-hand side margin indicare full marks.
L. (a) Aplate 0.05 mm distant from a fixed plate movest
a speed of 1.2 m/s and requires a force of 2.2Nto
mintain this speed. The surface area of the moving
plate is 1 m and the gap between the two plates is
filled by a viscous luid. Find the co-efficient of
dynamic viscosity of the fluid
(6) Determine pressure inside a (1) water droplet,
(ii) soap bubble and (iii) water jet in terms of sur
face tension o and diameter d.
2. (a) The temperature on earths surface drops about
5C for every km rise in elevation above earths
surface. If the air temperature at the ground level
is 15Cand pressure is 760 mm of mercury, at what
elevation pressure will be 380 mm of mercury.
Assume that air behave as ideal gas. 10
(Turn Over)
(a) A circular plate 1.5m in diameter is almerged in
water with its greatest and least depths from water
Om 1.75m. Determine total pres
ee on one side of this late depth of centre of
pressure.
te vexity vanwe dinensial flow field is givenly
Find the velocity and acceleration at a faint (1, 2)
after 2 sov.
(a) tra function is givenas determine the
tion and find the discharge passing between two
streamlines passing theory (1, Mama (63)
sequation alaosta streamline derive
4. (e) Prove that the velocity distribution for a steady lumi
nas flow in a circular piye is panalolie in nature and
the average velocity of dow is half the maximum
vekocity. 10
(0) A pipe of diameter mm is attached to a pipe of
300 mm diameter with their axes collinear with the
help of flange nie pipes are horizontal and water
flows from smallpipe to larger pipe at a stearly rate
00 litres pel What will be level difference in
differential emerciny manneter limbs of which are
connected to just upstream and downstream of the
Group B
3 Derive the Won Karman momentum integral equation for
the growth of boundary layer along a flat plate. Also,
determine the thickness of the boundary layer, shear
stress and drag force by using the momentum equation, 20
Pin:SN: MC (189) (2) (Continued)
2 of 6
6. (a) Briefly discuss IPraxtl's mixing length theory,
(0) Derive the equation for the Prandtl's universal
velocity distribution for turbulent flow in pipes, 15
7. (a) For comprensible flow of fluidn derive Demouli's
equation for isothermal and (i) adiabetle pro
cesses
(6) Discuss briefly the basic equations Otomprensible
fluid flow,
8. (a) In case of air flow in a conduit transition, the pre
sure, velocity and temperature at the upstream
section are 10 AN/m, 30 mA and 130'C' respec
tively. If at the downtreunicetion the velocity in
150 m/s, determine the provare and temperature if
the process is incoentropie
Take y-14 and R290 Ag/"K
correnponding to M2. Vind the peed of the yleine
ify and Raresante as in problema,
Group
9. Choose the most appropriate response 10 2
(0 With ineretane in tenperature the viscosity of liquids
and gases espectively:
(a) inercises and decreases
decreases and increases
increases and increases
(d) decreases and decreases
w715 FN MC 404 (1497)
3 of 6
(a) Capillary rise of liquid in tube:
(a) increases with increase in diameter
increases with decrease in diameter
(©) increases with inacast in specific weight
(d decreases with increase in surface tension
(in) The printers ink is an example of:
(a) Newtonian fhuid
(6) Non Newtonian fluid
S Thyrotropic substance
(d) Elastic solid
(iv) In case of flow through pipe ifReynold's Number is
less than 2000, the flow is:
(6) tutukat
(C) transition
(d unsteady
(v) In case of flow through orifices the relation between
coefficient of contraction (C), ar-efficient velocity
(C)and co-efficientof discharge (C) is given by:
17:5 FN MC 404 (1497) (4)
(Continued)
4 of 6
(vi) Blasius equation is used for
(a) laminar flow
(6) turbulent flow in rough pipes
(C) turbulent flow in smooth pipes for all values of
Reynolds number
(d) turbulent flow in smooth pipes for Reynolds
number less than 10
(vii) Darcy-Weisback equation is used to find loss of
head' due to:
(@) sudden enlargement
(6) sudden contraction
(c) fiction
(d) All of the above.
flow in rough pipes are
(viii) Factors determining friction factor for turbulent
(a) Mach Number and relative roughness
(6) Reynold number and relative roughness
€) Froude number and relative roughness
(d) Froude number and Mach number
(ix) Isoentropic flow is:
(a) isothermal reversible
(6) isothermal ireversible
AGS adiabatic reversible
(d) adiabatic imeversible
W17:3 FN MC 404 (1497)
(5)
(Turn Over)
5 of 6
(1) The process when change is state occurs at
constant volume is: 0
(a) isobaric
by isochoric
(©) isothermal
(a adiabatic
6 of 6
Ieindia winter 2017 mechanics of fluid question paper.
W'17:5 FN MC 404 (1497)
MECHANICS OF FLUID
Time Three hours
Maximum Marks 100
Answer FIVE questions, taking ANY TWO from Group A,
ANY Two from Group B and ALL from Group C.
All parts of a question (a, b, etc. should be
answered at one place.
Answer should be brief and to-the-point and be supple
mented with neat sketches. Unnecessary long answer may
result in loss of marks.
Any missing or wrong data may be assumed suitably
giving proper justification.
Figures on the right-hand side margin indicare full marks.
L. (a) Aplate 0.05 mm distant from a fixed plate movest
a speed of 1.2 m/s and requires a force of 2.2Nto
mintain this speed. The surface area of the moving
plate is 1 m and the gap between the two plates is
filled by a viscous luid. Find the co-efficient of
dynamic viscosity of the fluid
(6) Determine pressure inside a (1) water droplet,
(ii) soap bubble and (iii) water jet in terms of sur
face tension o and diameter d.
2. (a) The temperature on earths surface drops about
5C for every km rise in elevation above earths
surface. If the air temperature at the ground level
is 15Cand pressure is 760 mm of mercury, at what
elevation pressure will be 380 mm of mercury.
Assume that air behave as ideal gas. 10
(Turn Over)
(a) A circular plate 1.5m in diameter is almerged in
water with its greatest and least depths from water
Om 1.75m. Determine total pres
ee on one side of this late depth of centre of
pressure.
te vexity vanwe dinensial flow field is givenly
Find the velocity and acceleration at a faint (1, 2)
after 2 sov.
(a) tra function is givenas determine the
tion and find the discharge passing between two
streamlines passing theory (1, Mama (63)
sequation alaosta streamline derive
4. (e) Prove that the velocity distribution for a steady lumi
nas flow in a circular piye is panalolie in nature and
the average velocity of dow is half the maximum
vekocity. 10
(0) A pipe of diameter mm is attached to a pipe of
300 mm diameter with their axes collinear with the
help of flange nie pipes are horizontal and water
flows from smallpipe to larger pipe at a stearly rate
00 litres pel What will be level difference in
differential emerciny manneter limbs of which are
connected to just upstream and downstream of the
Group B
3 Derive the Won Karman momentum integral equation for
the growth of boundary layer along a flat plate. Also,
determine the thickness of the boundary layer, shear
stress and drag force by using the momentum equation, 20
Pin:SN: MC (189) (2) (Continued)
2 of 6
6. (a) Briefly discuss IPraxtl's mixing length theory,
(0) Derive the equation for the Prandtl's universal
velocity distribution for turbulent flow in pipes, 15
7. (a) For comprensible flow of fluidn derive Demouli's
equation for isothermal and (i) adiabetle pro
cesses
(6) Discuss briefly the basic equations Otomprensible
fluid flow,
8. (a) In case of air flow in a conduit transition, the pre
sure, velocity and temperature at the upstream
section are 10 AN/m, 30 mA and 130'C' respec
tively. If at the downtreunicetion the velocity in
150 m/s, determine the provare and temperature if
the process is incoentropie
Take y-14 and R290 Ag/"K
correnponding to M2. Vind the peed of the yleine
ify and Raresante as in problema,
Group
9. Choose the most appropriate response 10 2
(0 With ineretane in tenperature the viscosity of liquids
and gases espectively:
(a) inercises and decreases
decreases and increases
increases and increases
(d) decreases and decreases
w715 FN MC 404 (1497)
3 of 6
(a) Capillary rise of liquid in tube:
(a) increases with increase in diameter
increases with decrease in diameter
(©) increases with inacast in specific weight
(d decreases with increase in surface tension
(in) The printers ink is an example of:
(a) Newtonian fhuid
(6) Non Newtonian fluid
S Thyrotropic substance
(d) Elastic solid
(iv) In case of flow through pipe ifReynold's Number is
less than 2000, the flow is:
(6) tutukat
(C) transition
(d unsteady
(v) In case of flow through orifices the relation between
coefficient of contraction (C), ar-efficient velocity
(C)and co-efficientof discharge (C) is given by:
17:5 FN MC 404 (1497) (4)
(Continued)
4 of 6
(vi) Blasius equation is used for
(a) laminar flow
(6) turbulent flow in rough pipes
(C) turbulent flow in smooth pipes for all values of
Reynolds number
(d) turbulent flow in smooth pipes for Reynolds
number less than 10
(vii) Darcy-Weisback equation is used to find loss of
head' due to:
(@) sudden enlargement
(6) sudden contraction
(c) fiction
(d) All of the above.
flow in rough pipes are
(viii) Factors determining friction factor for turbulent
(a) Mach Number and relative roughness
(6) Reynold number and relative roughness
€) Froude number and relative roughness
(d) Froude number and Mach number
(ix) Isoentropic flow is:
(a) isothermal reversible
(6) isothermal ireversible
AGS adiabatic reversible
(d) adiabatic imeversible
W17:3 FN MC 404 (1497)
(5)
(Turn Over)
5 of 6
(1) The process when change is state occurs at
constant volume is: 0
(a) isobaric
by isochoric
(©) isothermal
(a adiabatic
6 of 6
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