Download PTU (I.K. Gujral Punjab Technical University Jalandhar (IKGPTU) ) BE/BTech Civil Engineering (CE) 2020 March 3rd Sem BTCE 303 18 Fluid Mechanics Previous Question Paper
Roll No. Total No. of Pages : 02
Total No. of Questions : 09
B.Tech.(CE) (2018 Batch)(ECE) (Sem.?3)
FLUID MECHANICS
Subject Code : BTCE-303-18
M.Code : 76372
Time : 3 Hrs. Max. Marks : 60
INSTRUCTIONS TO CANDIDATES :
1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks
each.
2. SECTION-B contains FIVE questions carrying FIVE marks each and students
have to attempt any FOUR questions.
3. SECTION-C contains THREE questions carrying TEN marks each and students
have to attempt any TWO questions.
SECTION-A
1. Write briefly :
a) Define fluid and distinguish between ideal and real fluids.
b) Distinguish between surface tension and capillarity.
c) Define absolute pressure and gauge pressure.
d) Explain Laminar and Turbulent flow.
e) State Buckingham?s Pi theorem.
f) Define Reynolds umber and Weber number.
g) How is turbulent motion classified?
h) State assumptions on which analysis of hydraulic jump is based upon.
i) What is meant by optimum shape of cross section of an open channel?
j) What are the limitations of Bernouli?s equation?
SECTION-B
2. A stationary bearing of length 30 cm and internal radius 8.025 cm has been used to
provide lateral stability to a 8 cm radius shaft rotating at a constant speed of 200
revolutions per minute. The space between shaft and bearing is filled with a lubricant
having viscosity 2.5 poise. Find the torque required to overcome the friction in bearing.
Take the velocity profile as linear.
FirstRanker.com - FirstRanker's Choice
1 | M-76372 (S2)- 375
Roll No. Total No. of Pages : 02
Total No. of Questions : 09
B.Tech.(CE) (2018 Batch)(ECE) (Sem.?3)
FLUID MECHANICS
Subject Code : BTCE-303-18
M.Code : 76372
Time : 3 Hrs. Max. Marks : 60
INSTRUCTIONS TO CANDIDATES :
1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks
each.
2. SECTION-B contains FIVE questions carrying FIVE marks each and students
have to attempt any FOUR questions.
3. SECTION-C contains THREE questions carrying TEN marks each and students
have to attempt any TWO questions.
SECTION-A
1. Write briefly :
a) Define fluid and distinguish between ideal and real fluids.
b) Distinguish between surface tension and capillarity.
c) Define absolute pressure and gauge pressure.
d) Explain Laminar and Turbulent flow.
e) State Buckingham?s Pi theorem.
f) Define Reynolds umber and Weber number.
g) How is turbulent motion classified?
h) State assumptions on which analysis of hydraulic jump is based upon.
i) What is meant by optimum shape of cross section of an open channel?
j) What are the limitations of Bernouli?s equation?
SECTION-B
2. A stationary bearing of length 30 cm and internal radius 8.025 cm has been used to
provide lateral stability to a 8 cm radius shaft rotating at a constant speed of 200
revolutions per minute. The space between shaft and bearing is filled with a lubricant
having viscosity 2.5 poise. Find the torque required to overcome the friction in bearing.
Take the velocity profile as linear.
2 | M-76372 (S2)- 375
3. The velocity components in x and y directions are given as :
u = 2xy
3
/3 ? x
2
y and v = xy
2
? 2yx
3
/3
Indicate whether the given velocity distribution is :
a) a possible field of flow
b) not a possible field of flow
4. A horizontal pipe of 5cm diameter conveys an oil of specific gravity 0.9 and dynamic
viscosity 0.8 kg/ms. Measurements indicate a pressure drop of 20 kN/m
2
per meter of
pipe length traversed. Make calculations for the
a) Flow rate of oil and centre line velocity
b) Wall shear stress and frictional drag over 100m of pipe length
c) Power of pump required assuming an overall efficiency of 60%
d) The velocity and shear stress at 1cm from the pipe surface.
5. Calculate the friction drag on a plate 15 cm wide and 45 cm long placed longitudinally in
a stream of oil (sp. Gr. 0.925 and kinematic viscosity 0.9 stokes) flowing with a free
stream velocity of 6m per second. Also find the thickness of the boundary layer and shear
stress at the trailing edge.
6. A 3m wide rectangular channel conveys 7.5m
3
/s of water with a velocity of 5m/s. Is there
a condition for hydraulic jump to occur? If so, calculate the height, length and strength of
the jump. Also determine the loss of energy per kg of water.
SECTION-C
7. State and prove Pascal?s law and give some examples where this principle is applied?
8. A blower having an efficiency of 75% is to supply 14 cubic meter of air per minute to a
15 cm pipe under a pressure equivalent of 5 cm of water. If the 30 cm intake pipe drawn
directly from the atmosphere, what horsepower motor should be provided? What will be
the pressure intensity in the intake pipe? ?
air
= 1.284 kg.m
3
.
9. Two reservoirs are connected by a pipeline which is 15 cm in diameter for the first 5m
and 25 cm in diameter for the remaining 15m. Entry to and exit from the pipe is sharp
and the water surface in the upper reservoir is 7.5 m above that in the lower reservoir.
Represent the layout and tabulate the head losses by assuming that the friction coefficient
is 0.01 for both the pipes. Further calculate the flow rate through the arrangement and
draw the hydraulic gradient and energy gradient lines.
NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any
page of Answer Sheet will lead to UMC against the Student.
FirstRanker.com - FirstRanker's Choice
This post was last modified on 21 March 2020