Hydraulics Online Test – Paper 3

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

2. Hydraulic gradient line for an open flow channel is

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

4. Specific weight of liquid

5. 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.)

6. *If the volume of liquid weighing 3000 kg is 4 cubic meters, then the specific gravity is

7. A fluid particle may possess the displacement of

8. *Pressure within a soap bubble is

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

10. *In flow, the liquid particles may possess

11. The term P/pg is known as

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

13. Poise is the unit of

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

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

16. The maximum velocity in an open channel occurs

17. *The magnitude of water hammer depends upon

18. An oil of specific gravity 0.7 and pressure 0.14 kgf/cm^2 will have the height of oil as

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

20. If the forces are due to inertia and gravity, and frictional resistance plays only a minor role, the design of channels is made by comparing

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

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

23. *Back water curve is caused if there is a

24. *Hydraulic gradient is equal to

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

26. *Manometers are used to measure

27. The Manning's formula for flow in an open channel is given by

28. *An ideal flow of a liquid obeys

29. In a flowing liquid, a particle may possess

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

31. *The atmospheric pressure varies with

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

33. *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

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

35. In an inclined position, a venturimeter records

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

37. For the flow of liquid from an open-ended tube (nozzle) leading to the formation of a spray of liquid drops, the number generally is

38. If the Froude number in open channel flow is less than 1.0, the flow is called

39. An intensifier is used to increase

40. The capillary rise or fall of the liquid is given by

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

42. *The most economical section of a circular channel for the maximum velocity is when

43. The viscosity of liquids varies with temperature

44. In the case of leveling by a level pipe, the level is indicated by

45. *The orifice used for low discharge is

46. *The term v^2/2g is known as

47. The ratio of the percentage error in the discharge and the percentage error in the measurement of head over a rectangular notch is

48. Total head of a particle in motion is the sum of

49. 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

50. *Head loss increases with