Hydraulics Online Test – Paper 3

1. For a circular channel, the wetted perimeter is given by (where θ=half the angle subtended by the water at the center and R= radius of circular channel)

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

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

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

5. Mouthpieces are used to measure

6. Which of the following quantities are dimensionless?

7. The pressure less than atmospheric pressure is known as

8. The term z is known as

9. Practical fluids possess

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

11. "Manning's formula is used for

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

13. 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

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

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

16. *Hydraulic gradient line (except siphon)

17. *The floating method is used for the measurement of

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

19. *The total pressure force on a plane area is equal to the area multiplied by the intensity of pressure at its centroid if

20. In a flowing liquid, a particle may possess

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

22. The inlet length of a venturimeter

23. *The magnitude of water hammer depends upon

24. Hydrostatic pressure on a dam depends upon its

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

26. *The flow in which the path of individual particles of liquid cross each other is called

27. The error 1% in measuring H will produce a

28. 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)

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

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

31. *Manometers are used to measure

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

33. Super-critical flow occurs in

34. *Bernoulli's equation is applied to

35. *Uniform flow is said to occur when

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

37. To ensure that water does not rise more than 100 cm above the crest, for a discharge of 5.00 m^3/sec, the length of the weir will be (Cd = 0.62)

38. *The atmospheric pressure varies with

39. 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.)

40. *Cipolletti weir is a trapezoidal weir having a side slope of

41. A fluid particle may possess the displacement of

42. *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

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

44. *Pressure head is given by

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

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

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

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

49. Liquids or fluids

50. If the velocity in a fluid flow changes with respect to the length of the direction of the flow, it is called