Searching for CE6451 Fluid Mechanics and Machinery Important Question Papers ? You can here collect expected questions of CE6451 Fluid Mechanics and Machinery for Anna University Chennai examinations. This subject is in 3rd Semester B.E Mechanical Engineering under Regulation 2013.
Anna University Chennai
Department of B.E Mechanical Engineering
Third Semester / III Semester / 03rd Semester
CE6451 Fluid Mechanics and Machinery
November / December 2015 Exam Important Questions
(Regulation 2013)
1.A drainage pipe is tapered in a section running with full of water. The pipe diameters a t the inlet
and exit are 1000 mm and 500 mm respectively. The water surface is 2 m above the centre of the
inlet and exit is 3 rn above the free surface of the water. The pressure at the exit is 250 mm of Hg
vacuum. The friction loss between the inlet and exit of the pipe is 1/10 of the velocity head at the
exit. Determine the discharge through the pipe.
2. Explain the properties of a hydraulic fluid
3. Derive continuity equation from basic principles.
4. (i) A 15 cm diameter vertical pipe is connected to 10 cm diameter Vertical pipe with a reducing
socket. The pipe carries a flow of 100 US. At point 1 in 15 cm pipe gauge pressure is 250 kPa. At
point 2 in the 10 cm pipe located 1.0 m below point 1 the gauge pressure is 175 kPa. (1) Find
whether the flow is upwards / downwards. (2) Head loss between the two points (ii) Differentiate
Venturimeter and Orificemeter.
5. The velocity distribution in the boundary layer is given by UN =y/6, where u is the velocity at a
distance y from the plate u=U at y =6, 6 being boundary layer thickness. Find the displacement
thickness, momentum thickness and energy thickness.
6. Explain the losses of energy in flow through pipes.
7. An oil of specific gravity 0.7 is flowing through a pipe of diameter 30 cm at the rate of 500 litres/sec. Find the head lost due to friction and power required to maintain the flow for a length of 1000 m. Take u: 0.29 stokes
8. The velocity of water in a pipe 2oomm diameter is Sm/s. The length of the pipe is 5om. Find the loss of head clue to friction, if f= 0.08
9. What are the criteria for selecting repeating variable in this dimensional analysis
10. Using Buckingham's II theorem, show that velocity, through a circular pipe orifice is given by H- head causing flow; D-dia of orifice u = Coefficient of viscosity p = mass density; g = acceleration due to gravity.
11. Classify Models with scale ratios.
12. (i) Explain Reynold's law of similitude and Froude's law of similitude. (8)
(ii) Explain different types of similarities. (8)
13. Show that the work done by a reciprocating pump is equal to the area ofthe indicator diagram.
14. Explain the working principle of reciprocating pump with neat sketch
15. Calculate the work saved by fitting an air vessel for a double acting single cylinder reciprocation
pump.
16. The diameter and stroke of a single acting reciprocating pump are 120 mm and 300 mm respectively. The water is lifted by a pump through a total head of 25 m. The diameter and length of delivery pipe are 100 mm and 20 m respectively.
17. Give the comparison between impulse and reaction turbine.
18. With the help of neat diagram explain the construction and working of a pelton wheel turbine
19. A Francis turbine with an overall efficiency of 76% and hydraulic efficiency of 80% is required to produce 150 kW. It is working under a head of 8 m. The peripheral velocity is 0.25 VZgH and
radial velocity of flow at inlet is 0.95 VZgH. The wheel runs at 150 rpm. Assuming radial discharge,
determine (i) Flow velocity at outlet (ii) The wheel angle at inlet (iii) Diameter and width of the wheel at inlet
20. 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 (i) Inlet and outlet blade angles (ii) Taking inlet width as 150
mm and neglecting the thickness of the blades, find the power developed by the turbine
Anna University Chennai
Department of B.E Mechanical Engineering
Third Semester / III Semester / 03rd Semester
CE6451 Fluid Mechanics and Machinery
November / December 2015 Exam Important Questions
(Regulation 2013)
1.A drainage pipe is tapered in a section running with full of water. The pipe diameters a t the inlet
and exit are 1000 mm and 500 mm respectively. The water surface is 2 m above the centre of the
inlet and exit is 3 rn above the free surface of the water. The pressure at the exit is 250 mm of Hg
vacuum. The friction loss between the inlet and exit of the pipe is 1/10 of the velocity head at the
exit. Determine the discharge through the pipe.
2. Explain the properties of a hydraulic fluid
3. Derive continuity equation from basic principles.
4. (i) A 15 cm diameter vertical pipe is connected to 10 cm diameter Vertical pipe with a reducing
socket. The pipe carries a flow of 100 US. At point 1 in 15 cm pipe gauge pressure is 250 kPa. At
point 2 in the 10 cm pipe located 1.0 m below point 1 the gauge pressure is 175 kPa. (1) Find
whether the flow is upwards / downwards. (2) Head loss between the two points (ii) Differentiate
Venturimeter and Orificemeter.
5. The velocity distribution in the boundary layer is given by UN =y/6, where u is the velocity at a
distance y from the plate u=U at y =6, 6 being boundary layer thickness. Find the displacement
thickness, momentum thickness and energy thickness.
6. Explain the losses of energy in flow through pipes.
7. An oil of specific gravity 0.7 is flowing through a pipe of diameter 30 cm at the rate of 500 litres/sec. Find the head lost due to friction and power required to maintain the flow for a length of 1000 m. Take u: 0.29 stokes
8. The velocity of water in a pipe 2oomm diameter is Sm/s. The length of the pipe is 5om. Find the loss of head clue to friction, if f= 0.08
9. What are the criteria for selecting repeating variable in this dimensional analysis
10. Using Buckingham's II theorem, show that velocity, through a circular pipe orifice is given by H- head causing flow; D-dia of orifice u = Coefficient of viscosity p = mass density; g = acceleration due to gravity.
11. Classify Models with scale ratios.
12. (i) Explain Reynold's law of similitude and Froude's law of similitude. (8)
(ii) Explain different types of similarities. (8)
13. Show that the work done by a reciprocating pump is equal to the area ofthe indicator diagram.
14. Explain the working principle of reciprocating pump with neat sketch
15. Calculate the work saved by fitting an air vessel for a double acting single cylinder reciprocation
pump.
16. The diameter and stroke of a single acting reciprocating pump are 120 mm and 300 mm respectively. The water is lifted by a pump through a total head of 25 m. The diameter and length of delivery pipe are 100 mm and 20 m respectively.
17. Give the comparison between impulse and reaction turbine.
18. With the help of neat diagram explain the construction and working of a pelton wheel turbine
19. A Francis turbine with an overall efficiency of 76% and hydraulic efficiency of 80% is required to produce 150 kW. It is working under a head of 8 m. The peripheral velocity is 0.25 VZgH and
radial velocity of flow at inlet is 0.95 VZgH. The wheel runs at 150 rpm. Assuming radial discharge,
determine (i) Flow velocity at outlet (ii) The wheel angle at inlet (iii) Diameter and width of the wheel at inlet
20. 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 (i) Inlet and outlet blade angles (ii) Taking inlet width as 150
mm and neglecting the thickness of the blades, find the power developed by the turbine
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