Hydraulics Online Test - Paper 3

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Vikash chaudhary

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Total Questions: 50
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1 / 50

1. *Rotameter is used for measuring

a) density of fluids

b) value of fluids in a pipe

c) discharge of fluids

d) pressure in fluids

2 / 50

2. 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

3 / 50

3. The pressure less than atmospheric pressure is known as

a) suction pressure

b) vacuum pressure

c) negative pressure

d) all of the above

4 / 50

4. *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

5 / 50

5. A fluid particle may possess the displacement of

a) translation

b) rotation

c) distortion

d) all of the above

6 / 50

6. If the Froude number in open channel flow is more than 1.0, the flow is called

a) critical flow

b) streaming flow

c) shooting flow

d) none of the above

7 / 50

7. 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

8 / 50

8. 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.

9 / 50

9. *Losses are more in

a) laminar flow

b) critical flow

c) turbulent flow

d) transition flow

10 / 50

10. *Head loss increases with

a) an increase in velocity

b) a decrease in velocity

c) a decrease in length of the pipe

d) an increase in the diameter of the pipe

11 / 50

11. A rise or fall of liquid in a glass tube of a very small diameter when dipped is

a) directly proportional to the force per unit length of periphery

b) directly proportional to the sine of the angle of contact

c) directly proportional to the specific weight of the liquid

d) inversely proportional to the diameter of the glass tube

12 / 50

12. 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]

13 / 50

13. 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

14 / 50

14. 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

15 / 50

15. 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

16 / 50

16. *To measure atmospheric pressure, we use

a) barometers

b) piezometer

c) manometers

d) differential manometers

17 / 50

17. 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

18 / 50

18. Weber number is the ratio of inertia force to

a) surface tension

b) gravitational force

c) elasticity

d) viscosity

19 / 50

19. 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

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. *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

22 / 50

22. "Maximum efficiency of power transmission through a pipe is

a) 50%

b) 60%

c) 66%

d) 76%

23 / 50

23. 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

24 / 50

24. *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

25 / 50

25. The most efficient channel section is

a) semi-circular

b) rectangular

c) triangular

d) trapezoidal

26 / 50

26. *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

27 / 50

27. *If the velocity in a fluid flow does not change with respect to the length of the direction of flow, it is called

a) steady flow

b) uniform flow

c) incompressible flow

d) rotational flow

28 / 50

28. If the Froude number in open channel flow is less than 1.0, the flow is called

a) critical flow

b) super-critical flow

c) sub-critical flow

d) none of the above

29 / 50

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

a) 2/3

b) 3/2

c) 2/5

d) 5/2

30 / 50

30. 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

31 / 50

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

a) plasticity

b) viscosity

c) compressibility

d) none of the above

32 / 50

32. 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

33 / 50

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

a) silts

b) sands

c) clays

d) gravels

34 / 50

34. 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

35 / 50

35. *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

36 / 50

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

a) discharge

b) head

c) pressure

d) none of the above

37 / 50

37. 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

38 / 50

38. *The equation of continuity of fluids is applicable only if

a) the flow is steady

b) the flow is in-compressible

c) the flow is one-dimensional

d) all of the above

39 / 50

39. Chazy's formula is used to determine

a) head loss due to friction in pipes

b) velocity of flow in pipe

c) velocity of flow in channels

d) none of the above

40 / 50

40. *In flow, the liquid particles may possess

a) potential energy

b) kinetic energy

c) pressure energy

d) all of the above

41 / 50

41. Liquids or fluids

a) have no shape

b) cannot be compressed

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

d) none of the above

42 / 50

42. 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

43 / 50

43. *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

44 / 50

44. 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

45 / 50

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

a) maximum

b) zero

c) unpredictable

d) none of the above

46 / 50

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

a) m = d

b) m = 2d

c) m = 3d

d) m = d/2

47 / 50

47. 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

48 / 50

48. *The upper surface of the notch over which water flows is known as

a) vein

b) nappe

c) sill

d) none of the above

49 / 50

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

a) fittings

b) sudden increase in diameter

c) sudden decrease in diameter

d) friction

50 / 50

50. *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

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