ANNA UNIVERSITY COIMBATORE
B.E./B.TECH. DEGREE EXAMINATIONS: DECEMBER 2009
REGULATIONS: 2008
THIRD SEMESTER
080180007- FLUID MECHANICS AND MACHINERY
(COMMON TO AERONAUTICAL/ AUTOMOBILE/ MECHANICAL ENGG.)
Max Marks: 100
PART-A
(20*2= 40 MARKS)
ANSWER ALL QUESTIONS
1. State Newton's law of viscosity.
2. List the assumptions of Bernoulli's equation.
3. Define compressibility.
4. State continuity equation.
5. What is the formula for calculating coefficient of contraction.
6. Define boundary layer thickness.
7. What is mach number?
8. What are the minor losses in pipe flow?
9. Differentiate distorted and undistorted model in dim analysis.
10. Explain Rayleigh's method.
11. Define geometric similarity.
12. Give the applications of Euler's model.
13. Define Manometric head.
14. What is specific speed of a cantrifugal pump?
15. What do you mean by hydraulic viscosity?
16. Write the expression used to find the jet ratio in a pelton wheel.
17. What is a slip in a reciprocating pump?
18. What is the application of an air vessel?
19. What is an indicator diagram?
20. List the advantages of double acting reciprocating pump.
PART-B
(5*12= 60 MARKS)
ANSWER ANY FIVE QUESTIONS
21. A 30cm diameter pipe, conveying water, branches into two pipes of diameters 20 cm and 15 cm respectively. If the average velocity in the 30cm diameter pipe is 2.5m/s, find the discharge in this pipe. Also determine the velocity in 15 cm pipe if the average velocity in 20 cm diameter pipe is 2m/s.
22. A 45° reducing bend is connected in a pipe line, the diameters at the inlet and the outlet of the bend being 600mm and 300mm respectively. Find the force exerted by the water on the bend if the intensity of pressure at the inlet to bend is 8.829N/cm2 and rate of flow of water is 600litres/s.
23. A thin plate is moving in still atmospheric air at a velocity of 5 m/s. The length of the plate is 0.6m and width 0.5 m. Calculate (a) the thickness of the boundary layer at the end of the plate, and (b) drag force on one side of the plate. Take the density of air as 1.24 Kg/m3 and kinematic viscosity 0.15 stokes.
24. What is the application of Darcy-Weisbach equation? Derive an expression for the same.
25. State Buckingham’s ? theorem. Write down the procedure for solving problems by Buckingham’s ? theorem.
26. The efficiency ? of a fan depends on density ?, dynamic viscosity ยต of the fluid, angular velocity ?, diameter D of the rotor and the discharge Q. Express ? in terms of the dimensionless parameters.
27. The internal and external diameters of the impeller of a centrifugal pump are 200 mm and 400 mm respectively. The pump is running at 1200 r.p.m. The vane angles of the impeller at inlet and outlet 20° and 30° respectively. The water enters the impeller radially and the velocity of flow is constant. Determine the work done by the impeller per unit weight of water.
28. Sketch and explain the working principle of a reciprocating pump.
KEYWORDS:FLUID MECHANICS AND MACHINERY,2009 ANNA UNIVERSITY CHENNAI B.E AERONAUTICAL ENGINEERING THIRD SEMESTER EXAMINATION- DECEMBER 2009 QUESTION PAPER,ANNA UNIVERSITY FLUID MECHANICS AND MACHINERY QUESTION PAPER,ANNA UNIVERSITY,ANNA UNIVERSITY CHENNAI,ANNA UNIVERSITY COIMBATORE,ANNA UNIVERSITY TRICHY,ANNA UNIVERSITY TIRUNELVELI,ANNA UNIVERSITY MADURAI,ANNA UNIVERSITY SYLLABUS,ANNA-UNIVERSITY RESULTS,ANNA UNIVERSITY DISTANCE EDUCATION,ANNA UNIVERSITY MBA-CENTRE FOR DISTANCE EDUCATION,ANNA UNIVERSITY SCHEDULE OF EXAMINATIONS,ANNA UNIVERSITY ADMISSION,ANNA UNIVERSITY COURSES,ANNA UNIVERSITY ACADEMIC,ANNA UNIVERSITY DEPARTMENTS,ANNA UNIVERSITY RESEARCH,ANNA UNIVERSITY MAIL,ANNA UNIVERSITY QUESTION PAPERS,ANNA UNIVERSITY COUNSELLING DATES,ANNA UNIVERSITY RE-EVALUATION RESULTS
B.E./B.TECH. DEGREE EXAMINATIONS: DECEMBER 2009
REGULATIONS: 2008
THIRD SEMESTER
080180007- FLUID MECHANICS AND MACHINERY
(COMMON TO AERONAUTICAL/ AUTOMOBILE/ MECHANICAL ENGG.)
Max Marks: 100
PART-A
(20*2= 40 MARKS)
ANSWER ALL QUESTIONS
1. State Newton's law of viscosity.
2. List the assumptions of Bernoulli's equation.
3. Define compressibility.
4. State continuity equation.
5. What is the formula for calculating coefficient of contraction.
6. Define boundary layer thickness.
7. What is mach number?
8. What are the minor losses in pipe flow?
9. Differentiate distorted and undistorted model in dim analysis.
10. Explain Rayleigh's method.
11. Define geometric similarity.
12. Give the applications of Euler's model.
13. Define Manometric head.
14. What is specific speed of a cantrifugal pump?
15. What do you mean by hydraulic viscosity?
16. Write the expression used to find the jet ratio in a pelton wheel.
17. What is a slip in a reciprocating pump?
18. What is the application of an air vessel?
19. What is an indicator diagram?
20. List the advantages of double acting reciprocating pump.
PART-B
(5*12= 60 MARKS)
ANSWER ANY FIVE QUESTIONS
21. A 30cm diameter pipe, conveying water, branches into two pipes of diameters 20 cm and 15 cm respectively. If the average velocity in the 30cm diameter pipe is 2.5m/s, find the discharge in this pipe. Also determine the velocity in 15 cm pipe if the average velocity in 20 cm diameter pipe is 2m/s.
22. A 45° reducing bend is connected in a pipe line, the diameters at the inlet and the outlet of the bend being 600mm and 300mm respectively. Find the force exerted by the water on the bend if the intensity of pressure at the inlet to bend is 8.829N/cm2 and rate of flow of water is 600litres/s.
23. A thin plate is moving in still atmospheric air at a velocity of 5 m/s. The length of the plate is 0.6m and width 0.5 m. Calculate (a) the thickness of the boundary layer at the end of the plate, and (b) drag force on one side of the plate. Take the density of air as 1.24 Kg/m3 and kinematic viscosity 0.15 stokes.
24. What is the application of Darcy-Weisbach equation? Derive an expression for the same.
25. State Buckingham’s ? theorem. Write down the procedure for solving problems by Buckingham’s ? theorem.
26. The efficiency ? of a fan depends on density ?, dynamic viscosity ยต of the fluid, angular velocity ?, diameter D of the rotor and the discharge Q. Express ? in terms of the dimensionless parameters.
27. The internal and external diameters of the impeller of a centrifugal pump are 200 mm and 400 mm respectively. The pump is running at 1200 r.p.m. The vane angles of the impeller at inlet and outlet 20° and 30° respectively. The water enters the impeller radially and the velocity of flow is constant. Determine the work done by the impeller per unit weight of water.
28. Sketch and explain the working principle of a reciprocating pump.
KEYWORDS:FLUID MECHANICS AND MACHINERY,2009 ANNA UNIVERSITY CHENNAI B.E AERONAUTICAL ENGINEERING THIRD SEMESTER EXAMINATION- DECEMBER 2009 QUESTION PAPER,ANNA UNIVERSITY FLUID MECHANICS AND MACHINERY QUESTION PAPER,ANNA UNIVERSITY,ANNA UNIVERSITY CHENNAI,ANNA UNIVERSITY COIMBATORE,ANNA UNIVERSITY TRICHY,ANNA UNIVERSITY TIRUNELVELI,ANNA UNIVERSITY MADURAI,ANNA UNIVERSITY SYLLABUS,ANNA-UNIVERSITY RESULTS,ANNA UNIVERSITY DISTANCE EDUCATION,ANNA UNIVERSITY MBA-CENTRE FOR DISTANCE EDUCATION,ANNA UNIVERSITY SCHEDULE OF EXAMINATIONS,ANNA UNIVERSITY ADMISSION,ANNA UNIVERSITY COURSES,ANNA UNIVERSITY ACADEMIC,ANNA UNIVERSITY DEPARTMENTS,ANNA UNIVERSITY RESEARCH,ANNA UNIVERSITY MAIL,ANNA UNIVERSITY QUESTION PAPERS,ANNA UNIVERSITY COUNSELLING DATES,ANNA UNIVERSITY RE-EVALUATION RESULTS