Hydraulics Online Test - Paper 3

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Vikash chaudhary

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1 / 50

1. 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

2 / 50

2. The head of water representing in the case of HGL line is known as

a) static head

b) residual head

c) pressure head

d) all of the above

3 / 50

3. Which of the following has the highest coefficient of discharge:

a) sharp-edged orifice

b) venturimeter

c) cipolleti weir

d) borda's mouthpiece running full

4 / 50

4. *Losses are more in

a) laminar flow

b) critical flow

c) turbulent flow

d) transition flow

5 / 50

5. To avoid an interruption in the flow of a siphon, the air vessel is provided

a) at the inlet

b) at the outlet

c) at the summit

d) at the point between the inlet and outlet

6 / 50

6. 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

7 / 50

7. *The orifice used for low discharge is

a) rectangular

b) circular

c) square

d) triangular

8 / 50

8. The phenomenon of rising of a liquid surface in a tube of small diameter relative to the adjacent normal level of the liquid is known as

a) capillary rise

b) capillary fall

c) rising

d) none of the above

9 / 50

9. A substance which deforms continuously under the action of shear stress is called

a) fluid

b) liquid

c) solid

d) gas

10 / 50

10. 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

11 / 50

11. Head loss due to friction in a pipe is given by the Darcy-Weisbach equation

a) h_f = 4fLV^2/2gd

b) h_f = fLV^2/2gd

c) h_f = 0.5V^2 / 2g

d) h_f = (v_1-v_2)^2 / 2g

12 / 50

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

a) maximum

b) zero

c) unpredictable

d) none of the above

13 / 50

13. 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

14 / 50

14. 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

15 / 50

15. *The phenomenon occurring in an open channel when a rapidly flowing stream abruptly changes to a slowly flowing stream, causing a distinct rise of the liquid surface, is

a) water hammer

b) hydraulic jump

c) critical discharge

d) all of the above

16 / 50

16. *The magnitude of capillary rise is more in:

a) silts

b) sands

c) clays

d) gravels

17 / 50

17. *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

18 / 50

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

a) 30°

b) 60°

c) 90°

d) 120°

19 / 50

19. A steady uniform flow is through a

a) long pipe at decreasing rate

b) long pipe at constant rate

c) long pipe at increasing rate

d) none of the above

20 / 50

20. *An ideal flow of a liquid obeys

a) continuity equation

b) Newton's second law of viscosity

c) Newton's second law of motion

d) dynamic viscosity

21 / 50

21. 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

22 / 50

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

a) normal depth

b) critical depth

c) alternate depth

d) all of the above

23 / 50

23. *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

24 / 50

24. Falling drops of water become spheres due to

a) adhesion

b) cohesion

c) surface tension

d) viscosity

25 / 50

25. Which of the following is the example of laminar flow?

a) underground flow

b) flow past tiny bodies

c) both of (a) and (b)

d) none of the above

26 / 50

26. 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

27 / 50

27. The minimum head loss will occur in

a) orifice meter

b) venturimeter

c) nozzle meter

d) none of the above

28 / 50

28. If the total head of the nozzle of a pipe is 37.5m and the discharge is 1 cubic meter per second, then the power generated is

a) 500 HP

b) 550 HP

c) 400 HP

d) 450 HP

29 / 50

29. *Capillary rise is proportional to

a) surface tension

b) unit weight of water

c) diameter of the pipe

d) none of the above

30 / 50

30. The inlet length of a venturimeter

a) is equal to the outlet length

b) is more than the outlet length

c) is less than the outlet length

d) none of the above

31 / 50

31. 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

32 / 50

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

a) twice

b) thrice

c) same

d) all of the above

33 / 50

33. 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

34 / 50

34. 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)

35 / 50

35. 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

36 / 50

36. In an open tube, the free surface of mercury remains

a) horizontal

b) curved upwards

c) curved downwards

d) none of the above

37 / 50

37. *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

38 / 50

38. Cavitations is collapsed by

a) low pressure

b) high pressure

c) low velocity

d) high velocity

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 discharge through a rectangular channel is maximum when

a) m = d/2

b) d=b/2

c) m=2d

d) both (a) and (b) above

41 / 50

41. The basic head loss in a long pipe is:

a) fittings

b) sudden increase in diameter

c) sudden decrease in diameter

d) friction

42 / 50

42. Hydrostatic pressure on a dam depends upon its

a) length

b) depth

c) shape

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

43 / 50

43. *Rotameter is used for measuring

a) density of fluids

b) value of fluids in a pipe

c) discharge of fluids

d) pressure in fluids

44 / 50

44. 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

45 / 50

45. *An independent mass of a fluid does not possess

a) elevation energy

b) kinetic energy

c) pressure energy

d) none of the above

46 / 50

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

a) in a liquid at rest

b) in a fluid at rest

c) in a laminar flow

d) in a turbulent flow

47 / 50

47. 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

48 / 50

48. 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

49 / 50

49. *Variation in volume of liquid with variation in pressure is called

a) plasticity

b) viscosity

c) compressibility

d) none of the above

50 / 50

50. The viscosity of liquids varies with temperature

a) directly proportional

b) inversely proportional

c) constant

d) none of the above

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