Hydraulics Online Test – Paper 3

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

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

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

4. *The wetted perimeter of a channel is given by

5. Flow in pipes is turbulent if the Reynolds number is

6. 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

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

8. *A pitot tube is used to measure

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

10. 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

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

12. The attraction among different particles of the same material is

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

14. In an open channel flow

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

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

17. Chazy's formula is used to determine

18. Which of the following quantities are dimensionless?

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

20. One horsepower is equal to

21. *Cavitations is caused by

22. *The hydraulic radius is equal to

23. Water hammer is a phenomenon that occurs

24. *Total energy line (T.E.L) represents the sum of

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

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

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

28. *Capillarity of water is

29. *The float method is used to measure

30. Reynolds number is the ratio of initial force and

31. For uniform flow in the channel

32. A ideal fluid

33. For the laminar flow through a circular pipe, the maximum velocity is

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

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

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

37. *The width of a weir with end contraction is

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

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

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

41. *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

42. In an inclined pipe, the pressure difference at its two ends is due to

43. The most economical section of a circular channel for the maximum discharge is when

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

45. The line joining the points to which the liquid rises in vertical piezometer tubes fitted at different cross-sections of a conduit is known as

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

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

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

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

50. *Bernoulli's equation assumes that