Hydraulics Online Test – Paper 3

1. Reynolds number is the ratio of initial force and

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

3. The basic head loss in a long pipe is:

4. The viscosity of gases varies with temperature

5. A siphon is used

6. If H is the height of the liquid above the sill, the effect of end contraction on each side, according to Francis' formula, is

7. When the fluid is at rest, the shear stress is

8. *The phenomenon occurring in an open channel when a rapidly flowing stream abruptly changes to a slowly flowing stream, causing a distinct rise of the liquid surface, is

9. A substance which deforms continuously under the action of shear stress is called

10. The viscosity of liquids varies with temperature

11. Velocity of flow may be determined using:

12. *The actual velocity through an orifice is........... than the theoretical velocity.

13. *In flow, the liquid particles may possess

14. "Manning's formula is used for

15. The discharge through a V-notch weir is directly proportional to:

16. *Viscosity of a liquid

17. *Capillary rise is proportional to

18. *Venturimeter is used to measure

19. *An orifice is called a large orifice if the water head is

20. *The upper surface of the notch over which water flows is known as

21. Water hammer is a phenomenon that occurs

22. When the water level on the downstream side of a weir is above the top surface of a weir, the weir is known as:

23. *The types of instrument used to measure low pressure with accuracy is

24. *If the velocity of fluid particles varies from point to point in magnitude and direction, as well as from instant to instant, the flow is said to be

25. *Head loss increases with

26. *The specific weight of water 1000 kg/m^3

27. *The magnitude of capillary rise is more in:

28. *Hydraulic gradient line (H.G.L.) represents the sum of

29. In the case of vortex flow, the level of water at the center is

30. Head loss due to friction in a pipe is given by the Darcy-Weisbach equation

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

32. *Chazy's formula is given by

33. For uniform flow in the channel

34. Specific energy of a flowing fluid per unit weight is equal to

35. In the case of a broad-crested weir, the depth of water h at the end of the still is given by

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. *Which of the following statements is valid?

38. *Water cushion is used to

39. If the fluid particles move in straight lines and all the lines are parallel to the surface, the flow is called

40. The total energy of a liquid in motion is equal to:

41. *Pascal's law states that pressure at a point is equal in all directions

42. The minimum head loss will occur in

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

44. *Capillarity of water is

45. The section of the Jet leaving an orifice, having the minimum cross-section area, is called

46. *What affects the quantity of mass of a fluid?

47. In an open channel flow

48. 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

49. A triangular notch is preferred to a rectangular notch because

50. *The hydraulic ram is a device