ME 2208 Fluid Mechanics and Machinery Lab - Viva Question

P.A COLLEGE OF ENGINEERING AND TECHNOLOGY POLLACHI - 642 002 DEPARTMENT OF MECHANICAL ENGINEERING

ME 2208 - FLUID MECHANICS AND MACHINERY LAB - VIVA QUESTION 1. Differentiate between Absolute and gauge pressures. 2.

Mention two pressure measuring instruments.

3. What is the difference weight density and mass density? 4. What is the difference between dynamic and kinematic viscosity? 5. Differentiate between specific weight and specific volume. 6.

Define relative density.

7.

What is vacuum pressure?

8. What is absolute zero pressure? 9. Write down the value of atmospheric pressure head in terms of water and Hg. 10. Differentiate between laminar and turbulent flow. 11. How will you classify the flow as laminar and turbulent? 12. Mention few discharge measuring devices 13. Draw the venturimeter and mention the parts. 14. Why the divergent cone is longer than convergent cone in venturimeter? 15. Compare the merits and demerits of venturimeter with orifice meter. 16. Why Cd value is high in venturimeter than orifice meter? 17. What is meant by Co efficient of discharge? 18. What is orifice plate? 19. What do you mean by vena contracta? 20. Define coefficient of discharge. 21. State Bernoulli’s Theorem. 22. Write down Hagen Poiseuille equation. 23. Write down Darcy - weisback's equation. Page 1 of 4

24. What is the difference between friction factor and coefficient of friction? 25. What do you mean by major energy loss? 26. List down the type of minor energy losses. 27. Define turbine 28. What are the classifications of turbine? 29. Define impulse turbine. 30. Define reaction turbine. 31. Differentiate between impulse and reaction turbine. 32. What is the function of draft tube? 33. Define specific speed of turbine. 34. What are the main parameters in designing a Pelton wheel turbine? 35. What is breaking jet in Pelton wheel turbine? 36. What is the function of casing in Pelton Turbine? 37. Draw a simple sketch of Pelton wheel bucket. 38. What is the function of surge tank fixed to penstock in Pelton turbine? 39. How the inlet discharge is controlled in Pelton turbine? 40. What is water hammer? 41. What do you mean by head race? 42. What do you mean by tail race? 43. What is the difference between propeller and Kaplan turbine? 44. Mention the parts of Kaplan turbine. 45. Differentiate between inward and outward flow reaction turbine. 46. What is the difference between Francis turbine and Modern Francis turbine? 47. What is mixed flow reaction turbine? Give an example. 48. Why draft tube is not required in impulse turbine? 49. How turbines are classified based on head. Give example. 50. How turbines are classified based on flow. Give example 51. How turbines are classified based on working principle. Give example. Page 2 of 4

52. What does velocity triangle indicates? 53. Draw the velocity triangle for radial flow reaction turbine. 54. Draw the velocity triangle for tangential flow turbine. 55. Mention the type of characteristic curves for turbines. 56. How performance characteristic curves are drawn for turbine. 57. Mention the types of efficiencies calculated for turbine. 58. Define pump. 59. How pumps are classified? 60. Differentiate pump and turbine. 61. Define Rotodynamic pump. 62. Define Positive displacement pump. 63. Differentiate between Rotodynamic and positive displacement pump. 64. Define cavitation in pump. 65. What is the need for priming in pump? 66. Give examples for Rotodynamic pump 67. Give examples for Positive displacement pump. 68. Mention the parts of centrifugal pump. 69. Mention the type of casing used in centrifugal pump. 70. Why the foot valve is fitted with strainer? 71. Why the foot valve is a non return type valve? 72. Differentiate between volute casing and vortex casing. 73. What is the function of volute casing? 74. What is the function of guide vanes? 75. Why the vanes are curved radially backward? 76. What is the function of impeller? 77. Mention the types of impeller used. 78. Define specific speed of pump. 79. Mention the type of characteristic curves for pump Page 3 of 4

80. How performance characteristic curves are drawn for pump. 81. Mention the parts of reciprocating pump. 82. What is the function of air vessel? 83. What is slip of reciprocating pump? 84. What is negative slip? 85. What is the condition for occurrence of negative slip? 86. What does indicator diagram indicates? 87. What is the difference between actual and ideal indicator diagram? 88. Briefly explain Gear pump. 89. Differentiate between internal gear pump and external gear pump. 90. Briefly explain vane pump. 91. What is rotary pump? 92. Draw the velocity triangle for centrifugal pump. 93. Draw the indicator diagram fro reciprocating pump. 94. What is the amount of work saved by air vessel? 95. Mention the merits and demerits of centrifugal pump. 96. Mention the merits and demerits of reciprocating pump. 97. What is separation in reciprocating pump? 98. How separation occurs in reciprocating pump? 99. Differentiate single acting and double acting reciprocating pump.

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