Hydraulic and fluid mechanics Mcq PART-1

Hydraulic and fluid mechanics Mcq PART-1

01. A notch is used to measure __________ of liquids.

A. discharge

02. A flow is called sonic, if the Mach number is

A. unity.

03. A flow through a long pipe at decreasing rate is called __________ uniform flow.

A. Unsteady

04. The surface tension of mercury at normal temperature is __________ that of water.

A. higher than

05. Water is a __________ fluid.

A. newtonian

06. Barometer is used to measure

A.atmospheric pressure

07. The dynamic viscosity of the liquid __________ with rise in temperature.

A.decreases

08. When the Mach number is between __________ the flow is called super‐sonic flow.

                

A.1 and 6

09. The factional resistance of a pipe varies approximately with__________ of the liquid.

A.square of velocity

10. A manometer is used to measure

                       

A.pressure in pipes and channels

11. The product of mass and acceleration of flowing liquid is called

A.inertia force

12. A point, in a compressible flow where the velocity of fluid is zero, is called

A.stagnation point

13. Falling drops of water become spheres due to the property of

                         

A.surface tension of water

14. The total energy of a liquid particle in motion is equal to

A.pressure energy + kinetic energy + potential energy

15. Coefficient of velocity is defined as the ratio of

A.actual velocity of jet at vena contracta to the theoretical velocity

16. A differential manometer is used to measure

A.difference of pressures between two points in a pipe

17. The point at which the resultant pressure on an immersed surface acts, is known as

A.centre of pressure

18. The volume of a fluid __________ as the pressure increases.

A.decreases

19. The specific gravity of water is taken as

A.1

20. A pitot tube is used to measure the

                    

A.velocity of flow at the required point in a pipe

21 . In order to measure the flow with a venturimeter, it is installed in

                                

A.any direction and in any location

22. The total head of a liquid particle in motion is equal to

A.pressure head + kinetic head + potential head

23. The reciprocal of Euler's number is

A. called Newton number

24. A fluid which obeys the Newton's law of viscosity is termed as

A.newtonian fluid

     

25. In a venturiflume, the flow takes place at

                 

A. atmospheric pressure

26. When the flow in an open channel is gradually varied, the flow is said to be

A.Steady non‐uniform flow

27. When the Mach number is equal to unity, the flow is called

A. sonic flow.

28. A weir, generally, used as a spillway of a dam is

                        

C.Ogee weir

29. Poise is the unit of viscosity in

A. C.G.S. system of units.

30. When the Mach number is more than 6, the flow is called

                  

A.hypersonic flow

31. If the depth of water in an open channel is less than the critical depth, the flow is called

A.torrential flow

32. When a body is immersed wholly or partially in a liquid, it is lifted up by a force equal to the weight of liquid displaced by the body. This statement is called

                     

A. Archimede’s principle

33. The ratio of the inertia force to the pressure force is called

A. Euler's number.

34. A nozzle is generally made of

A. convergent shape

35. The unit of surface tension is

A.N/m

36. A notch is, usually, made of a

A. metallic plate.

37. The top of the weir over which the water flows is known as

A. sill or crest

38. The highest efficiency is obtained with a channel of __________ section.

                           

D.trapezoidal 

39. Coefficient of discharge Cd is equal to (where Cc = Coefficient of contraction, Cv = Coefficient of velocity, and Cr = Coefficient of resistance)

A.Cc x Cv

40. The critical depth meter is used to measure

               

A.    hydraulic jump

                   

41. Froude's number is the ratio of inertia force to

A. gravity force

42. A body floating in a liquid is said to be in neutral equilibrium, if its metacentre

A. coincides with its centre of gravity

43. One cubic metre of water weighs

D.1000 litres

44. An average value of coefficient of velocity is

A.0.97

45. A structure used to dam up a stream or river over which the water flows is called

A. weir

46. The coefficient of discharge for an external mouthpiece depends upon

A. length of mouthpiece

47. The specific gravity has

A. no units.

48. The ratio of the inertia force to the gravity

force is called

A. Froude number.

49. Laminar flow takes place at

A. very low velocities.

50. A manometer can be used to measure

A. vacuum pressures.

51. The tendency of a liquid to uplift a submerged body, because of the upward thrust of the liquid, is known as

A. buoyancy.

52. The discharge over a triangular notch is

A. directly proportional to H^5/2

53. The loss of pressure head in case of laminar flow is proportional to

A. velocity

54. The flow of water through the hole in the bottom of a wash basin is an example of

                          

A. free vortex

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