Hydraulics Online Test – Paper 3

1. *The upper surface of the weir over which water flows is known as:

2. To avoid an interruption in the flow of a siphon, the air vessel is provided

3. The phenomenon of rising of a liquid surface in a tube of small diameter relative to the adjacent normal level of the liquid is known as

4. *A pitot tube is used to measure

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

6. *Hydraulic gradient line (except siphon)

7. For the laminar flow through a circular pipe, the maximum velocity is

8. *Hydraulic gradient is equal to

9. *Molecules of fluids get attracted due to

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

11. *If fluid or flow parameters at any given instant remain the same at every point in space, it is called:

12. *The hydraulic radius is equal to

13. 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.

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

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

16. *Viscosity of a liquid

17. Hooke's law for solids is analogous to

18. *The discharge through a trapezoidal channel is maximum when

19. Super-critical flow occurs in

20. *Barometers are used to measure

21. The viscosity of gases varies with temperature

22. *The continuity equation deals with the law of conservation of

23. If the pressure is applied to the surface of a liquid, the liquid transmits the pressure equally in all directions is given by

24. A steady uniform flow is through a

25. *Piezometers are used to measure

26. A siphon is used

27. *If the volume of a liquid weighing 2400 kg is 3 cubic meters, then 0.8 is its:

28. In fluids, steady flow occurs when

29. The ratio of the mean velocity to the surface velocity in open channels is equal to

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

31. *The discharge through a rectangular channel is maximum when

32. The ratio of the inertia and gravitational force acting in any flow, ignoring other forces, is called

33. 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

34. *Pressure within a soap bubble is

35. *A flow is said to be laminar when

36. The hydrostatic force exerted by 2 m deep water on the gate downstream is equal to

37. When the pipes are connected in series, the total rate of flow

38. The viscosity of liquids varies with temperature

39. *Cipolleti weir is a

40. Discharge over an ogee weir remains the same as that of

41. The multiplying factor for converting one poise into MKS unit of dynamic viscosity is

42. The attraction among different particles of the same material is

43. *The rise of the water table, which takes place due to the transformation of the unstable shooting flow (super-critical) to the stable streaming is called

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

45. In an open channel flow

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

47. Velocity of flow may be determined using:

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

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

50. The profile of rising water on the upstream side of the dam is called