Hydraulics Online Test – Paper 3

1. The basic head loss in a long pipe is:

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

3. *An ideal flow of a liquid obeys

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

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

6. *The hydraulic radius is equal to

7. *The condition for the maximum velocity and discharge is given by (closed flow)

8. Water hammer is a phenomenon that occurs

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

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

11. If the Froude number in open channel flow is more than 1.0, the flow is called

12. *An orifice is called a large orifice if the water head is

13. Poise is the unit of

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

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

16. 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.)

17. *Bernoulli's equation assumes that

18. *If a pitot tube is placed with its nose facing downstream, the liquid

19. In an open channels the analysis of a sugar is done by using

20. The depth of flow after the hydraulic jump is

21. The pressure less than atmospheric pressure is known as

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

23. 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)

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

25. Hydrostatic pressure on a dam depends upon its

26. Hydraulic gradient line and total energy line are

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

28. 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.

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

30. *The magnitude of water hammer depends upon

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

32. Super-critical flow occurs in

33. If the total head of the nozzle of a pipe is 37.5m and the discharge is 1 cubic meter per second, then the power generated is

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

35. A siphon is an

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

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

38. A triangular notch is preferred to a rectangular notch because

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

40. One horsepower is equal to

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

42. Reynolds number is the ratio of initial force and

43. *Hydraulic gradient line (except siphon)

44. Mass density of liquid (p) is given by

45. The section of the Jet leaving an orifice, having the minimum cross-section area, is called

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

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

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. Falling drops of water become spheres due to

50. *Piezometers are used to measure