Hydraulics Online Test – Paper 3

1. Pick up the correct statement from the following

2. 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

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

4. Cavitations is collapsed by

5. *A stepped notch is a combination of

6. *What affects the quantity of mass of a fluid?

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

8. *Orifice-meter is used to measure:

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

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

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

12. *The discharge passing through the crest having a length of 1.25m, a height of the flow of water 0.25m, and C_d = 0.035 is

13. *Rotameter is used for measuring

14. The viscosity of gases varies with temperature

15. Water belongs to

16. *The hydraulic ram is a pump that works on

17. Hydraulic gradient line and total energy line are

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

19. *Hydraulic gradient line (except siphon)

20. At the vena contracta, the jet has the minimum cross-sectional area, and so the velocity of the liquid at this section will be

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

22. *Surface tension is the force

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

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

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

26. In a flowing liquid, a particle may possess

27. 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.)

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

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

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

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

32. *Differential manometers are used to measure

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

34. Rotation is defined as the movement of a fluid element in such a way that both of its axes rotate in...

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

36. 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)

37. *The continuity equation deals with the law of conservation of

38. In an open channel flow

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

40. *Venturimeter is used to measure

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

42. *Stoke is the unit of

43. An intensifier is used to increase

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

45. Falling drops of water become spheres due to

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

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

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. *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

50. *The pressure in pipe flow is normally