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. *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

2 / 50

2. *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

3 / 50

3. 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

4 / 50

4. *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

5 / 50

5. The minimum head loss will occur in

a) orifice meter

b) venturimeter

c) nozzle meter

d) none of the above

6 / 50

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

a) 1/2

b) 2/3

c) 3/2

d) 3/4

7 / 50

7. Water hammer is a phenomenon that occurs

a) when pressure increases sudden closure of the valve

b) when pressure decreases sudden opening of the valve

c) due to the elastic material of the pipe

d) due to the incompressible nature of the fluid

8 / 50

8. 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

9 / 50

9. 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

10 / 50

10. 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

11 / 50

11. Liquids or fluids

a) have no shape

b) cannot be compressed

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

d) none of the above

12 / 50

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

a) kinetic energy

b) pressure energy

c) kinetic energy per unit weight

d) none of the above

13 / 50

13. *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

14 / 50

14. 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

15 / 50

15. *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

16 / 50

16. 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

17 / 50

17. Poise is the unit of

a) mass density

b) kinematic viscosity

c) viscosity

d) pressure gradient

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. 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

20 / 50

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

a) higher than circumference

b) lower than circumference

c) same as circumference

d) all of the above

21 / 50

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

a) maximum

b) zero

c) unpredictable

d) none of the above

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. *Losses are more in

a) laminar flow

b) critical flow

c) turbulent flow

d) transition flow

24 / 50

24. *The actual velocity through an orifice is........... than the theoretical velocity.

a) more

b) less

c) equal

d) not defined

25 / 50

25. Discharge over an ogee weir remains the same as that of

a) sharp-crested weir

b) triangular weir

c) Cipolleti weir

d) drowned weir

26 / 50

26. Gauge pressure is

a) absolute - atmosphere

b) absolute + atmosphere

c) atmospheric ± absolute

d) none of the above

27 / 50

27. *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

28 / 50

28. 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

29 / 50

29. 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.

30 / 50

30. *A pitot tube is used to measure

a) pressure

b) different in pressure

c) velocity of flow

d) none of the above

31 / 50

31. The viscosity of gases varies with temperature

a) directly proportional

b) inversely proportional

c) constant

d) none of the above

32 / 50

32. *Bernoulli's equation is applied to

a) venturimeter

b) orifice meter

c) pitot tube

d) all of the above

33 / 50

33. Find the capillary rise/fall in a glass tube when immersed in mercury with the following given data: surface tension, σ = 0.52 gmf/cm, angle of contact, θ = 130°, S.G. of mercury = 13.6, diameter of the pipe = 2.5 mm.

a) 0.393 cm rise

b) 0.393 cm fall

c) neither fall nor rise

d) all of the above

34 / 50

34. When the water level on the downstream side of a weir is above the top surface of a weir, the weir is known as:

a) submerged weir

b) narrow-crested weir

c) broad-crested weir

d) ogee weir

35 / 50

35. *In flow, the liquid particles may possess

a) potential energy

b) kinetic energy

c) pressure energy

d) all of the above

36 / 50

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

a) (q^2/g)^1/3

b) (q^2/g)^1/4

c) (q^2/g)^1/2

d) none of the above

37 / 50

37. Mach number is the ratio of inertia force to

a) viscosity

b) Froude number

c) gravitational force

d) elasticity

38 / 50

38. 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

39 / 50

39. 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

40 / 50

40. The numerical value of vorticity is.....of the rotation

a) twice

b) thrice

c) same

d) all of the above

41 / 50

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

a) 40 kN

b) 10 kN

c) 20 kN

d) 30 kN

42 / 50

42. *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

43 / 50

43. *Surface float is used to measure

a) pressure

b) difference in pressure

c) viscosity of flow

d) none of the above

44 / 50

44. *Water cushion is used to

a) sit in the house

b) destroy the energy

c) produce energy

d) none of the above

45 / 50

45. 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

46 / 50

46. In fluids, steady flow occurs when

a) the condition of flow change steadily with time

b) the condition of flow do not change with time

c) the condition of flow remains the same at adjacent points

d) the velocity vector remains constant at a point

47 / 50

47. Reynolds number is the ratio of initial force and

a) viscosity

b) elasticity

c) gravitational force

d) surface tension

48 / 50

48. The depth of flow after the hydraulic jump is

a) d2 = d1/2 [√1+8(Fe)1^2 -1]

b) d1 = d2/2 [√1+8(Fe)1^2 -1]

c) d2 = d1/3 [√1+8(Fe)1^2 -1]

d) d2 = d1/2 [√1+2(Fe)1^2 -1]

49 / 50

49. *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

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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