Hydraulics Online Test – Paper 3

1. *Cavitations is caused by

2. *Bernoulli's equation is applied to

3. The upward water pressure at the base of the structure is called

4. The pressure difference between inside and outside of a droplet of water is given by (Where σ is surface tension and d is the diameter of the droplet.)

5. *Manometers are used to measure

6. Critical depth (he) is given by (where q= rate of flow per unit width of channel)

7. The head of water representing in the case of HGL line is known as

8. *If a pitot tube is placed with its nose facing downstream, the liquid

9. *Water cushion is used to

10. *To measure very low pressure, we use:

11. *The total pressure force on a plane area is equal to the area multiplied by the intensity of pressure at its centroid if

12. Falling drops of water become spheres due to

13. *The rate of flow through a V-notch varies as:

14. *Losses are more in

15. Mass density of liquid (p) is given by

16. *Total energy line (T.E.L) represents the sum of

17. The continuity equation

18. The imaginary line drawn such that the tangents at its all points indicate the direction of the velocity of the fluid particle at each point is called

19. *If a pitot tube is placed with its nose facing sideways, the liquid

20. For a long pipe, the head loss

21. *A stepped notch is a combination of

22. *The difference between the total energy line and the hydraulic gradient line is

23. *The magnitude of water hammer depends upon

24. *Surface float is used to measure

25. *The wetted perimeter of a channel is given by

26. Gauge pressure is

27. Pick up the correct statement from the following

28. The numerical value of vorticity is.....of the rotation

29. For uniform flow in the channel

30. *The width of a weir with end contraction is

31. ........ is defined as the maximum increase in water level in the path of the flow of water

32. The term z is known as

33. Specific weight of sea water is more than that of pure water because of

34. In an open tube, the free surface of mercury remains

35. *The atmospheric pressure varies with

36. Find the capillary rise/fall in a glass tube when immersed in mercury with the following given data: surface tension, σ = 0.52 gmf/cm, angle of contact, θ = 130°, S.G. of mercury = 13.6, diameter of the pipe = 2.5 mm.

37. Flow in pipes is turbulent if the Reynolds number is

38. Weber number is the ratio of inertia force to

39. *Viscosity of a liquid

40. *Uniform flow is said to occur when

41. The line joining the points to which the liquid rises in vertical piezometer tubes fitted at different cross-sections of a conduit is known as

42. *The condition for the maximum velocity and discharge is given by (closed flow)

43. *If the velocity, pressure, density, etc., do not change at a point with respect to time, the flow is called

44. *Bernoulli's equation assumes that

45. *The rate of flow through a venturimeter varies as

46. Euler's number is the ratio of

47. A vessel having a depth of 30 cm is filled with water up to a depth of 10 cm from the top level. Find the pressure exerted at a depth of 5 cm and 15 cm from the top of the vessel respectively

48. Crest of a weir is lower than d/s water level

49. If the Froude number in open channel flow is equal to 1.0, the flow is called

50. *Capillarity of water is