Hydraulics Online Test – Paper 3

1. *If the velocity, pressure, density, etc., change at a point with respect to time, the flow is called

2. *Viscosity of a liquid

3. *The atmospheric pressure varies with

4. Which of the following quantities are dimensionless?

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

6. *Surface tension is the force

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

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

9. The two depths at which the specific energy is the same are called

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

11. If S is the height of the crest above the base of the channel and H is the head of water over the weir, whose length is L and discharge is Q m^3/sec, the velocity of approach V_a is

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

13. Falling drops of water become spheres due to

14. Total pressure on the top of a closed cylindrical vessel completely filled with liquid is directly proportional to

15. *An independent mass of a fluid does not possess

16. *Orifice-meter is used to measure:

17. *Hydraulic gradient line (except siphon)

18. *The energy possessed by a fluid by virtue of its existing pressure is called

19. A siphon is used

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

21. Cavitations in flowing fluid occurs when

22. In an open channel flow

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

24. *Cipolleti weir is a

25. A fluid particle may possess the displacement of

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

27. From a nozzle exposed to the atmosphere, the liquid jet traverses

28. If the volume of a liquid weighing 3000 kg is 4 cubic meters, then 0.75 is its

29. 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.

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

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

32. The maximum velocity in an open channel occurs

33. Gauge pressure is

34. *Uniform flow is said to occur when

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

36. *Variation in volume of liquid with variation in pressure is called

37. Mach number is the ratio of inertia force to

38. *The hydraulic ram is a pump that works on

39. 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

40. 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

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

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

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

44. If the fluid particles move in a zig-zag way, the flow is called

45. The thickness of a sharp-crested weir is kept less than

46. If the density of a fluid is constant from point to point in a flow region, it is called

47. As per our convenience which one is correct with respect to the dimensionless number?

48. *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

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

50. *Head loss increases with