Hydraulics Online Test - Paper 3

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

1. *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

2 / 50

2. If the specific gravity of oil is 0.7, then find the density of oil

a) 1000 kg/cm^3

b) 900 kg/cm^3

c) 800 kg/cm^3

d) 700 kg/cm^3

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3. 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

4 / 50

4. Crest of a weir is lower than d/s water level

a) submerged weir

b) Cipolletti weir

c) triangular weir

d) sharp-crested weir

5 / 50

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

a) Euler number

b) Froude number

c) Reynolds number

d) Weber number

6 / 50

6. *Manometers 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

7 / 50

7. For the same specific force, the two depths at which the same discharge occurs are called

a) alternate depths

b) conjugate depths

c) critical depths

d) normal depths

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8. 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

9 / 50

9. The viscosity of gases varies with temperature

a) directly proportional

b) inversely proportional

c) constant

d) none of the above

10 / 50

10. 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.

11 / 50

11. *Chazy's formula is given by

a) v = C√mi

b) v = m√ci

c) v = C√mci

d) v = i√mc

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12. For a long pipe, the head loss

a) at the entrance is ignored

b) at the outlet is ignored

c) at the entrance and outlet both are ignored

d) due to friction is ignored

13 / 50

13. *Bernoulli's equation is applied to

a) venturimeter

b) orifice meter

c) pitot tube

d) all of the above

14 / 50

14. *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

15 / 50

15. *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

16 / 50

16. *Rotameter is used for measuring

a) density of fluids

b) value of fluids in a pipe

c) discharge of fluids

d) pressure in fluids

17 / 50

17. 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

18 / 50

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

a) half of the width = sloping side

b) top width = 1/2 sloping side

c) top width = 1.5 sloping side

d) none of the above

19 / 50

19. "Manning's formula is used for

a) flow in open channels

b) head loss due to friction in open channels

c) head loss due to friction in pipes flowing full

d) flow in pipes

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

a) dissolved air

b) dissolved salts

c) suspended matter

d) all of the above

21 / 50

21. *To measure atmospheric pressure, we use

a) barometers

b) piezometer

c) manometers

d) differential manometers

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22. *Hydraulic gradient is equal to

a) difference in water surface / total length of the channel

b) total loss due to friction / total length of the channel

c) wetted perimeter / total length of the channel

d) area of cross-section / total length of the channel

23 / 50

23. Cavitations in flowing fluid occurs when

a) the total energy suddenly increases

b) the total energy suddenly decreases

c) the total energy is constant

d) none of the above

24 / 50

24. The Manning's formula for flow in an open channel is given by

a) v = n R^2/3 S^1/2

b) none of the above

c) v = 1/n R^2/3 S^1/2

d) v = 1/n R^1/2 S^2/3

25 / 50

25. 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

26 / 50

26. *Cipolleti weir is a

a) rectangular weir whose length is kept 3 times the height of the water above the sill

b) triangular weir, whose notch angle is 90°

c) trapezoidal weir, whose sides slope 1 horizontal to 4 verticals

d) a combination of rectangular and triangular weirs

27 / 50

27. An intensifier is used to increase

a) pressure

b) temperature

c) energy

d) none of the above

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28. Water belongs to

a) compressible fluids

b) none of the above

c) Newtonian fluids

d) non-Newtonian fluids

29 / 50

29. One horsepower is equal to

a) 1 kW

b) 0.746 kW

c) 0.836 kW

d) 0.756 kW

30 / 50

30. A siphon is an

a) L-shaped pipe

b) U-shaped pipe

c) inverted U-shaped pipe

d) all of the above

31 / 50

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

a) steady flow

b) laminar flow

c) uniform flow

d) rotational flow

32 / 50

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

a) h = H/2

b) h = 2H/3

c) h = 3H/4

d) h = H

33 / 50

33. *Losses are more in

a) laminar flow

b) critical flow

c) turbulent flow

d) transition flow

34 / 50

34. 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

35 / 50

35. *Uniform flow is said to occur when

a) the size and shape of the cross-section in a particular length remain constant

b) the size and shape of the cross-section change along a length

c) the frictional loss in the particular length of the channel will be more than the drop in elevation

d) the frictional loss in the particular length of the channel will be less than the drop in elevation

36 / 50

36. An oil of specific gravity 0.7 and pressure 0.14 kgf/cm^2 will have the height of oil as

a) 70 cm of oil

b) 2 m of oil

c) 20 cm of oil

d) 80 cm of oil

37 / 50

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

a) vein

b) nappe

c) sill

d) none of the above

38 / 50

38. A ideal fluid

a) is frictionless and incompressible

b) obey Newton's law of viscosity

c) is similar to gas

d) is very viscous

39 / 50

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

a) the maximum velocity=1.5 times the average velocity

b) the maximum velocity=2.0 times the average velocity

c) the maximum velocity=2.5 times the average velocity

d) none of the above

40 / 50

40. Weber number is the ratio of inertia force to

a) surface tension

b) gravitational force

c) elasticity

d) viscosity

41 / 50

41. *Barometers 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

42 / 50

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

a) mass

b) momentum

c) energy

d) force

43 / 50

43. 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

44 / 50

44. In a venturimeter, the divergent cone is kept

a) shorter than the convergent cone

b) longer than the convergent cone

c) equal to the convergent cone

d) none of the above

45 / 50

45. *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

46 / 50

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

a) the area is horizontal

b) the area is vertical

c) the area is inclined

d) all of the above

47 / 50

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

a) depth of water = 0.95 diameter of the circular section

b) hydraulic mean depth = 0.286 diameter of the circular section

c) wetted perimeter = 2.6 diameters of the circular section

d) all of the above

48 / 50

48. *Capillarity of water is

a) directly proportional to surface tension

b) inversely proportional to the angle of contact

c) inversely proportional to the diameter of the pipe

d) all of the above

49 / 50

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

a) steady

b) uniform

c) compressible

d) laminar

50 / 50

50. *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

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