Hydraulics Online Test - Paper 3

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Vikash chaudhary

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Total Questions: 50
Time Allotted: 50 minutes
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1 / 50

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

a) does not rise in the tube

b) rises in the tube to a height √v^2/sg

c) falls in the tube to a depth √v^2/2g

d) none of the above

2 / 50

2. Weber number is the ratio of inertia force to

a) surface tension

b) gravitational force

c) elasticity

d) viscosity

3 / 50

3. *The magnitude of water hammer depends upon

a) the length of the pipeline

b) elastic properties of liquid

c) elastic properties of the pipe material

d) diameter of the pipeline

4 / 50

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

a) specific weight

b) specific mass

c) specific gravity

d) none of the above

5 / 50

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

a) only one reading is required

b) its formula is simple to remember

c) it gives more accurate results for low discharge (Q≤100m^3/sec)

d) it measures a wide range of flows accurately

6 / 50

6. A fluid particle may possess the displacement of

a) translation

b) rotation

c) distortion

d) all of the above

7 / 50

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

a) depth of water = 0.810 diameter

b) hydraulic mean depth = 0.304 diameter of the circular section

c) wetted perimeter = 2.245 diameters of the circular section

d) all of the above

8 / 50

8. Open channel flow is

a) one in which the liquid is flowing in a conduit and has a free surface

b) one in which the liquid is flowing in a closed conduit running full

c) a covered channel running full

d) one in which the liquid is flowing in a conduit under pressure

9 / 50

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

a) 1%

b) 1.5%

c) 2%

d) 2.5%

10 / 50

10. The pressure less than atmospheric pressure is known as

a) suction pressure

b) vacuum pressure

c) negative pressure

d) all of the above

11 / 50

11. *The float method is used to measure

a) the discharge in an open channel

b) the velocity in an open channel

c) discharge open in an open channel

d) all of the above

12 / 50

12. The total energy of a liquid in motion is equal to:

a) pressure energy + kinetic energy + potential energy

b) pressure energy - (kinetic energy + potential energy)

c) potential energy - (pressure energy + kinetic energy)

d) kinetic energy - (pressure energy + potential energy)

13 / 50

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

a) kinetic head

b) pressure head

c) datum head

d) loss of head

14 / 50

14. *In flow, the liquid particles may possess

a) potential energy

b) kinetic energy

c) pressure energy

d) all of the above

15 / 50

15. Chazy's formula is used to determine

a) head loss due to friction in pipes

b) velocity of flow in pipe

c) velocity of flow in channels

d) none of the above

16 / 50

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

a) p = mass/volume

b) p = metric slug/m^2

c) p = kgsec^3/m^4

d) all of the above

17 / 50

17. One horsepower is equal to

a) 1 kW

b) 0.746 kW

c) 0.836 kW

d) 0.756 kW

18 / 50

18. *Which of the following statements is valid?

a) a fluid with low viscosity resists motion because its molecular structure gives it a lot of internal friction

b) viscosity describes the internal friction of a moving fluid

c) two fluids with the same dynamic viscosities have the same kinematic viscosities irrespective of their densities

d) intensity of liquid pressure at the bottom of a tank is w.g.h/3

19 / 50

19. *Piezometers are used to measure

a) pressure in water channels, pipes, etc.

b) difference in pressure at two points

c) atmospheric pressure

d) very low pressure

20 / 50

20. *To measure atmospheric pressure, we use

a) barometers

b) piezometer

c) manometers

d) differential manometers

21 / 50

21. Hooke's law for solids is analogous to

a) Newton's law of viscosity

b) Pascal's law

c) Boundary layer theory

d) continuity equation

22 / 50

22. 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.)

a) 2σ/d

b) 4σ/d

c) 6σ/d

d) 8σ/d

23 / 50

23. An intensifier is used to increase

a) pressure

b) temperature

c) energy

d) none of the above

24 / 50

24. The continuity equation

a) expresses the relationship between work and energy

b) relates the momentum per unit volume between two points on a stream line

c) relates the mass rate of flow along a stream line

d) requires that Newton's second law of motion be satisfied at every point in the fluid.

25 / 50

25. Which of the following quantities are dimensionless?

a) surface tension

b) specific weight

c) angular velocity

d) Mach number

26 / 50

26. Reynolds number is the ratio of initial force and

a) viscosity

b) elasticity

c) gravitational force

d) surface tension

27 / 50

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

a) mass

b) momentum

c) energy

d) force

28 / 50

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

a) 0.55

b) 0.75

c) 0.88

d) 1.75

29 / 50

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

a) minimum

b) maximum

c) average

d) critical

30 / 50

30. 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

a) Reynold number

b) Froude number

c) Weber number

d) Mach number

31 / 50

31. *Bernoulli's equation is applied to

a) venturimeter

b) orifice meter

c) pitot tube

d) all of the above

32 / 50

32. The imaginary line drawn such that the tangents at its all points indicate the direction of the velocity of the fluid particle at each point is called

a) path line

b) stream line

c) potential line

d) streak line

33 / 50

33. Pick up the correct statement from the following

a) total energy gradient is the graphical representation of the total head at any section of a pipeline

b) vertical distance between the total energy line and hydraulic grade line is equal to the velocity head

c) vertical distance between the total energy line and total energy gradient represents the loss of head

d) all of the above

34 / 50

34. In an open channel flow

a) the hydraulic gradient line is lower than the liquid surface

b) the hydraulic gradient line coincides with the liquid surface

c) the hydraulic gradient line is higher than the liquid surface

d) none of the above

35 / 50

35. 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

a) hydraulic gradient

b) piezometric line

c) pressure grade line

d) all of the above

36 / 50

36. *Pressure head is given by

a) P/w

b) z

c) v/2g

d) all

37 / 50

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

a) unsteady flow

b) compressible flow

c) rotational flow

d) none of the above

38 / 50

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

a) the principle of water hammer

b) the principle of centrifugal action

c) the principle of reciprocation action

d) all of the above

39 / 50

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

a) kinetic head

b) pressure head

c) datum head

d) loss of head

40 / 50

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

a) equal to the width of the channel

b) less than the width of the channel

c) half the width of the channel

d) none of the above

41 / 50

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

a) 6% to 7%

b) 8% to 10%

c) 12% to 15%

d) 25% to 30%

42 / 50

42. The thickness of a sharp-crested weir is kept less than

a) one-third of the height of water on the sill

b) one-half of the height of water on the sill

c) two-thirds of the height of water on the sill

d) four-thirds of the height of water on the sill

43 / 50

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

a) elevation energy

b) kinetic energy

c) potential energy

d) all of the above

44 / 50

44. Hydrostatic pressure on a dam depends upon its

a) length

b) depth

c) shape

d) both (b) and (c) of the above

45 / 50

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

a) back water curve

b) forwater curve

c) normal water curve

d) all of the above

46 / 50

46. When the fluid is at rest, the shear stress is

a) maximum

b) zero

c) unpredictable

d) none of the above

47 / 50

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

a) upper face

b) middle face

c) lower face

d) all of the above

48 / 50

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

a) uniform flow

b) turbulent flow

c) stream line flow

d) none of the above

49 / 50

49. For uniform flow in the channel

a) the total energy line, hydraulic gradient line, and the bottom of the channel are parallel

b) the total energy line and water surface are horizontal, while the bottom of the channel is inclined

c) total energy line, water surface, and the bottom of the channel are parallel

d) none of the above

50 / 50

50. *Losses are more in

a) laminar flow

b) critical flow

c) turbulent flow

d) transition flow

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