Hydraulics Online Test – Paper 3

1. The difference in pressure head measured by a mercury-oil differential manometer for a 20 cm difference of mercury level will be (specific gravity of oil-0.8)

2. Cavitations is collapsed by

3. *Piezometers are used to measure

4. *Chazy's formula is given by

5. *Pressure head is given by

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

7. A ideal fluid

8. 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

9. The depth of flow at which the specific energy is minimum is called

10. For uniform flow in the channel

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

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

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

14. For the same specific force, the two depths at which the same discharge occurs are called

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

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

17. *The orifice used for low discharge is

18. The flow in which each liquid particle has a definite path is called

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

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

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

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

23. Poise is the unit of

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

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

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

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

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

29. *Bernoulli's theorem deals with the law of conservation of

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

31. A rise or fall of liquid in a glass tube of a very small diameter when dipped is

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

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

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

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

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

37. Hydraulic gradient line for an open flow channel is

38. *Cavitations is caused by

39. Mouthpieces are used to measure

40. Water hammer is a phenomenon that occurs

41. 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.)

42. Falling drops of water become spheres due to

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

44. The term P/pg is known as

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

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

47. *1 m head is equivalent to

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

49. *The imaginary line joining each head of water is called

50. *The equation of continuity of fluids is applicable only if