Hydraulics Online Test – Paper 3

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

2. *Capillary rise is proportional to

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

4. Chazy's formula is used to determine

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

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

7. The viscosity of liquids varies with temperature

8. *The main assumption of Bernoulli's equation is

9. 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)

10. Gauge pressure is

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

12. 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

13. *Bernoulli's equation is applied to

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

15. *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

16. With a clinging nappe of a weir, the excess discharge is

17. *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

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

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

20. *Cipolleti weir is a

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

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

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

24. *The hydraulic radius is equal to

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

26. The term P/pg is known as

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

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

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

30. 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.

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

32. The water immediately downstream of the conduit or weir is called

33. Falling drops of water become spheres due to

34. Mach number is the ratio of inertia force to

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

36. If H is the height of the liquid above the sill, the effect of end contraction on each side, according to Francis' formula, is

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

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

39. Mouthpieces are used to measure

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

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

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

43. 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)

44. A ideal fluid

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

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

47. Critical depth (he) is given by (where q= rate of flow per unit width of channel)

48. 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

49. Euler's number is the ratio of

50. "Manning's formula is used for