Hydraulics Online Test - Paper 3

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

1. A siphon is an

a) L-shaped pipe

b) U-shaped pipe

c) inverted U-shaped pipe

d) all of the above

2 / 50

2. A ideal fluid

a) is frictionless and incompressible

b) obey Newton's law of viscosity

c) is similar to gas

d) is very viscous

3 / 50

3. The difference in pressure head measured by a mercury-oil differential manometer for a 20 cm difference of mercury level will be (specific gravity of oil-0.8)

a) 2.72m of oil

b) 2.52m of oil

c) 3.20m of oil

d) 0.2m of oil

4 / 50

4. 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

5 / 50

5. *Bernoulli's theorem deals with the law of conservation of

a) energy

b) all of the above

c) mass

d) momentum

6 / 50

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

a) submerged weir

b) Cipolletti weir

c) triangular weir

d) sharp-crested weir

7 / 50

7. *Venturimeter is used to measure

a) rate of flow

b) velocity

c) depth of flow

d) all of the above

8 / 50

8. *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

9 / 50

9. *Hydraulic gradient line (except siphon)

a) remains above the centerline of the conduit

b) remains below the centerline of the conduit

c) remains parallel to the centerline of the conduit

d) may be above or below the centerline of the conduit

10 / 50

10. The multiplying factor for converting one poise into MKS unit of dynamic viscosity is

a) 1

b) 0.1

c) 0.001

d) 0.0001

11 / 50

11. *Bernoulli's equation is applied to

a) venturimeter

b) orifice meter

c) pitot tube

d) all of the above

12 / 50

12. 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

13 / 50

13. 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

14 / 50

14. 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

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. *The floating method is used for the measurement of

a) discharge

b) head

c) pressure

d) none of the above

17 / 50

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

a) more

b) less

c) equal

d) not defined

18 / 50

18. *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

19 / 50

19. *To measure atmospheric pressure, we use

a) barometers

b) piezometer

c) manometers

d) differential manometers

20 / 50

20. Which of the following quantities are dimensionless?

a) surface tension

b) specific weight

c) angular velocity

d) Mach number

21 / 50

21. Mouthpieces are used to measure

a) velocity

b) pressure

c) head

d) rate of flow

22 / 50

22. *Pressure within a soap bubble is

a) equal to vapor pressure

b) less than external pressure

c) more than external pressure

d) equal to external pressure

23 / 50

23. *The rate of flow through a V-notch varies as:

a) H

b) H1/2

c) H3/2

d) H5/2

24 / 50

24. 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

25 / 50

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

a) vein

b) nappe

c) sill

d) none of the above

26 / 50

26. A siphon is used

a) to connect water reservoirs at different levels intervened by a hill

b) to supply water to a town from a higher level to a lower level

c) to fill up a tank with water at a higher level from a lower level

d) none of the above

27 / 50

27. When the pipes are connected in series, the total rate of flow

a) is equal to the sum of the rate of flow in each pipe

b) is equal to the reciprocal of the sum of the rate of flow in each pipe

c) is the same as flowing through each pipe

d) none of the above

28 / 50

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

a) unsteady

b) non-uniform

c) turbulent

d) incompressible

29 / 50

29. 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

30 / 50

30. *Orifice-meter is used to measure:

a) pressure at the point

b) discharge

c) average speed

d) velocity

31 / 50

31. *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

32 / 50

32. 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

33 / 50

33. *If the velocity of fluid particles varies from point to point in magnitude and direction, as well as from instant to instant, the flow is said to be

a) laminar

b) turbulent flow

c) uniform flow

d) non-uniform flow

34 / 50

34. The attraction among different particles of the same material is

a) adhesion

b) cohesion

c) corrosion

d) fusion

35 / 50

35. *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

36 / 50

36. Super-critical flow occurs in

a) normal slope

b) mild slope

c) steep slope

d) all of the above

37 / 50

37. 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

38 / 50

38. 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

39 / 50

39. *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

40 / 50

40. 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

41 / 50

41. *Total energy line (T.E.L) represents the sum of

a) pressure head and kinetic head

b) kinetic head and datum head

c) pressure head and datum head

d) pressure head, kinetic head, and datum head

42 / 50

42. 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

43 / 50

43. *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

44 / 50

44. 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

45 / 50

45. *Surface float is used to measure

a) pressure

b) difference in pressure

c) viscosity of flow

d) none of the above

46 / 50

46. Hydrostatic pressure on a dam depends upon its

a) length

b) depth

c) shape

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

47 / 50

47. *The condition for the maximum velocity and discharge is given by (closed flow)

a) 0.81D & 0.95D

b) 0.82D & 0.94D

c) 0.83D & 0.93D

d) 0.84D & 0.92D

48 / 50

48. *If the volume of liquid weighing 3000 kg is 4 cubic meters, then the specific gravity is

a) 750 kg/m^3

b) 12000 kg/m^3

c) 1.33

d) 0.75

49 / 50

49. *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

50 / 50

50. *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

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