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. *The notch angle for the maximum discharge over a triangular notch is

a) 30°

b) 60°

c) 90°

d) 120°

2 / 50

2. *Cavitations is caused by

a) low pressure

b) high pressure

c) low velocity

d) high velocity

3 / 50

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

a) afflux

b) rising of the wall

c) flood

d) rainfall

4 / 50

4. Specific energy of a flowing fluid per unit weight is equal to

a) (v^2/2g) + h

b) (h^2/2g) + v

c) (v^2/2h) + g

d) (v^2/3g) + h

5 / 50

5. 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

6 / 50

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

a) hydraulic gradient line

b) residual line

c) loss of gradient line

d) none of the above

7 / 50

7. *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

a) 0.0116 cm³/sec

b) 0.116 cm³/sec

c) 0.0160 cm³/sec

d) 0.00116 cm³/sec

8 / 50

8. Total pressure on the top of a closed cylindrical vessel completely filled with liquid is directly proportional to

a) radius

b) (radius)^2

c) (radius)^3

d) (radius)^4

9 / 50

9. *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

10 / 50

10. As per our convenience which one is correct with respect to the dimensionless number?

a) WIS-MIE-RIV-FIG-EIP

b) WIE-MIS-RIV-FIG-IEP

c) MIE-WIS-RIG-FIV-PIE

d) WIG-MIS-RIE-FIV-IPE

11 / 50

11. Hydraulic gradient line for an open flow channel is

a) below water level

b) same as water level

c) above water level

d) all of the above

12 / 50

12. The term P/pg is known as

a) kinetic energy

b) pressure energy per unit weight

c) kinetic energy per unit weight

d) none of the above

13 / 50

13. 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

14 / 50

14. Weber number is the ratio of inertia force to

a) surface tension

b) gravitational force

c) elasticity

d) viscosity

15 / 50

15. *A stepped notch is a combination of

a) rectangular notches of different sizes

b) triangular notches of different sizes

c) rectangular and triangular notches

d) all of the above

16 / 50

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

a) steady flow

b) unsteady flow

c) non-uniform flow

d) compressible flow

17 / 50

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

a) hydraulic jump

b) standing wave

c) both (a) and (b) above

d) water cushion

18 / 50

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

a) crest

b) notch

c) top level

d) none of the above

19 / 50

19. Mouthpieces are used to measure

a) velocity

b) pressure

c) head

d) rate of flow

20 / 50

20. *Bernoulli's equation is applied to

a) venturimeter

b) orifice meter

c) pitot tube

d) all of the above

21 / 50

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

a) steady flow

b) incompressible flow

c) uniform flow

d) rotational flow

22 / 50

22. A vessel having a depth of 30 cm is filled with water up to a depth of 10 cm from the top level. Find the pressure exerted at a depth of 5 cm and 15 cm from the top of the vessel respectively

a) 0, 50 kg/m^2

b) 0, 150 kg/m^2

c) 0, 100 kg/m^2

d) 50 kg/m^2, 50 kg/m^2

23 / 50

23. *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

24 / 50

24. 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)

a) 2.48 m

b) 2.73 m

c) 2.50 m

d) 2.51 m

25 / 50

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

a) acceleration due to gravity

b) distance from the center of the earth

c) elevation of the body

d) none of the above

26 / 50

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

a) stream line flow

b) uniform flow

c) steady flow

d) turbulent flow

27 / 50

27. *1 m head is equivalent to

a) 0.1 kg/cm^2

b) 0.2 kg/cm^2

c) 0.3 kg/cm^2

d) 0.4 kg/cm^2

28 / 50

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

a) head water

b) tail water

c) main water

d) surplus water

29 / 50

29. Liquids or fluids

a) have no shape

b) cannot be compressed

c) both (a) and (b) of above

d) none of the above

30 / 50

30. *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

31 / 50

31. *Orifice-meter is used to measure:

a) pressure at the point

b) discharge

c) average speed

d) velocity

32 / 50

32. *Rotameter is used for measuring

a) density of fluids

b) value of fluids in a pipe

c) discharge of fluids

d) pressure in fluids

33 / 50

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

a) unsteady

b) non-uniform

c) turbulent

d) incompressible

34 / 50

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

a) pressure head and kinetic head

b) kinetic head and datum head

c) pressure head, kinetic head, and datum head

d) pressure head and datum head

35 / 50

35. 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

36 / 50

36. *Stoke is the unit of

a) surface tension

b) viscosity

c) kinematic viscosity

d) none of the above

37 / 50

37. *The floating method is used for the measurement of

a) discharge

b) head

c) pressure

d) none of the above

38 / 50

38. 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

39 / 50

39. *If a pitot tube is placed with its nose facing sideways, the liquid

a) rises in the tube

b) falls in the tube

c) neither rises nor falls in the tube

d) all of the above

40 / 50

40. In an inclined position, a venturimeter records

a) less reading

b) same reading

c) more reading

d) none of the above

41 / 50

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

a) 1%

b) 1.5%

c) 2%

d) 2.5%

42 / 50

42. *In flow, the liquid particles may possess

a) potential energy

b) kinetic energy

c) pressure energy

d) all of the above

43 / 50

43. A siphon is an

a) L-shaped pipe

b) U-shaped pipe

c) inverted U-shaped pipe

d) all of the above

44 / 50

44. *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

45 / 50

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

a) orifice meter

b) venturimeter

c) mouthpiece

d) vena contracta

46 / 50

46. *Differential manometers are used to measure

a) pressure in water channels

b) difference in pressure at two points

c) atmospheric pressure

d) very low pressure

47 / 50

47. 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

48 / 50

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

a) maximum

b) zero

c) unpredictable

d) none of the above

49 / 50

49. Hydrostatic pressure on a dam depends upon its

a) length

b) depth

c) shape

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

50 / 50

50. *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

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