Download PTU (Punjab Technical University) B.Tech (Bachelor of Technology) / BE (Bachelor of Engineering) 2021 January AE 3rd Sem 76401 Fluid Mechanics And Fluid Machines Previous Question Paper
Roll No.
Total No. of Pages : 02
Total No. of Questions : 18
B.Tech. (AE) (2018 Batch) (Sem.?3)
FLUID MECHANICS AND FLUID MACHINES
Subject Code : BTAE-303-18
M.Code : 76401
Time : 3 Hrs. Max. Marks : 60
INST RUCT IONS T O CANDIDAT ES :
1 .
SECT ION-A is COMPULSORY cons is ting of TEN questions carrying TWO marks
each.
2 .
SECT ION-B c ontains F IVE questions c arrying FIVE marks eac h and s tud ents
have to atte mpt any FOUR q ues tions.
3 .
SECT ION-C contains THREE questions carrying T EN marks e ach and s tudents
have to atte mpt any T WO questio ns.
SECTION-A
Answer briefly :
1.
What is the difference between gauge pressure and absolute pressure?
2.
What is viscosity? What is the cause of it in liquids and in gases?
3.
List the causes of minor energy losses in flow through pipes.
4.
What is the difference between a laminar flow and turbulent flow?
5.
Define and explain Reynolds number, Froude's number, Euller's number and Mach
number.
6.
Define "SLIP" of reciprocating pump. When does the negative slip occur?
7.
Classify pumps on the basis of transfer of mechanical energy.
8.
What is draft tube and explain its function?
9.
Define hydraulic efficiency of a turbine.
10. Draw velocity triangle diagram for Pelton Wheel turbine.
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SECTION-B
11. a) Explain the properties of a hydraulic fluid.
b) A 0.5 m shaft rotates in a sleeve under lubrication with viscosity 5 poise at 200 rpm.
Calculate the power lost for a length of 100 mm if the thickness of the oil is 1 mm.
12. Derive an expression for head loss through pipes due to friction.
13. A single acting reciprocating pump running at 50 rpm. delivers 0.01 m3/s of water. The
diameter of the piston is 200 mm and stroke length 400 mm. Determine the theoretical
discharge of the pump, coefficient of discharge and slip and the percentage slip of the
pump.
14. Explain with the help of a diagram, the essential features of a Kaplan Turbine.
15. Write short notes on the following :
a) Dimensionless Homogeneity with example.
b) Euler Model Law.
SECTION-C
16. In an inward radial flow turbine, water enters at an angle of 22? to the wheel tangent to
the outer rim and leaves at 3 m/s. The flow velocity is constant through the runner. The
inner and outer diameters are 300 mm and 600 mm respectively. The speed of the runner
is 300 mm. The discharge through the runner is radial. Find the :
a) Inlet and outlet blade angles
b) Taking inlet width as 150 mm and neglecting the thickness of the blades, find the
power developed by the turbine.
17. The efficiency ( of a fan depends on (density), (viscosity) of the fluid. (angular
velocity), d (diameter of rotor) and Q (discharge). Express in terms of non- dimensional
parameters. Use Buckingham's theorem.
18. a) A power transmission pipe 10 cm diameter and 500 m long is fitted with a nozzle at
the exit, the inlet is from a river with water level 60 m above the discharge nozzle.
Assume f = 0.02. Calculate the maximum power which can be transmitted and the
diameter of nozzle required.
b) A horizontal Venturi meter with inlet diameter 200 mm and throat diameter 100 mm
is employed to measure the flow of water. The reading of the differential manometer
connected to the inlet is 180 mm of mercury. If Cd = 0.98, determine the rate of flow.
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.
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This post was last modified on 26 June 2021