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. *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

2 / 50

2. 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

3 / 50

3. 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

4 / 50

4. The viscosity of gases varies with temperature

a) directly proportional

b) inversely proportional

c) constant

d) none of the above

5 / 50

5. Rotation is defined as the movement of a fluid element in such a way that both of its axes rotate in...

a) the same direction

b) different directions

c) both of the above

d) none of the above

6 / 50

6. 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

7 / 50

7. 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

8 / 50

8. If the volume of a liquid weighing 3000 kg is 4 cubic meters, then 0.75 is its

a) specific weight

b) specific mass

c) specific gravity

d) none of the above

9 / 50

9. 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

10 / 50

10. If S is the height of the crest above the base of the channel and H is the head of water over the weir, whose length is L and discharge is Q m^3/sec, the velocity of approach V_a is

a) √2gh

b) Q/L(H-L)

c) Q/L(H+L)

d) L(H+S)/Q

11 / 50

11. *The wetted perimeter of a channel is given by

a) 4.75Q^2

b) 4.75Q

c) 4.75√Q

d) none of the above

12 / 50

12. Practical fluids possess

a) viscosity

b) surface tension

c) compressibility

d) all of the above

13 / 50

13. In the case of leveling by a level pipe, the level is indicated by

a) upper face

b) middle face

c) lower face

d) all of the above

14 / 50

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

a) unsteady

b) non-uniform

c) turbulent

d) incompressible

15 / 50

15. *Cipolletti weir is a trapezoidal weir having a side slope of

a) H:V::1:2

b) H:V::2:1

c) H:V::1:4

d) none of the above

16 / 50

16. *A flow is said to be laminar when

a) the fluid particles move in a zig-zag way

b) the Reynolds number is high

c) the fluid particles move in layers parallel to the boundary

d) none of the above

17 / 50

17. At the vena contracta, the jet has the minimum cross-sectional area, and so the velocity of the liquid at this section will be

a) minimum

b) maximum

c) average

d) critical

18 / 50

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

a) more

b) less

c) equal

d) not defined

19 / 50

19. *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

20 / 50

20. *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

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. Mach number is the ratio of inertia force to

a) viscosity

b) Froude number

c) gravitational force

d) elasticity

23 / 50

23. 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

24 / 50

24. *Capillary rise is proportional to

a) surface tension

b) unit weight of water

c) diameter of the pipe

d) none of the above

25 / 50

25. Total head of a particle in motion is the sum of

a) potential head and kinetic head

b) kinetic head and pressure head

c) potential head and pressure head

d) potential head, kinetic head, and pressure head

26 / 50

26. 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]

27 / 50

27. 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

28 / 50

28. *Pressure head is given by

a) P/w

b) z

c) v/2g

d) all

29 / 50

29. Flow in pipes is turbulent if the Reynolds number is

a) less than 2100

b) more than 3000

c) between 2100 and 3000

d) none of the above

30 / 50

30. Water belongs to

a) compressible fluids

b) none of the above

c) Newtonian fluids

d) non-Newtonian fluids

31 / 50

31. *Back water curve is caused if there is a

a) friction head loss is more than the bed slope

b) obstruction due to weir in the channel

c) there is an increase in width of the channel

d) none of the above

32 / 50

32. *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

33 / 50

33. *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

34 / 50

34. Hydrostatic pressure on a dam depends upon its

a) length

b) depth

c) shape

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

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. *If the velocity, pressure, density, etc., change at a point with respect to time, the flow is called

a) uniform

b) compressible

c) unsteady

d) incompressible

37 / 50

37. 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

38 / 50

38. Open channel flow is

a) one in which the liquid is flowing in a conduit and has a free surface

b) one in which the liquid is flowing in a closed conduit running full

c) a covered channel running full

d) one in which the liquid is flowing in a conduit under pressure

39 / 50

39. The ratio of the mean velocity to the surface velocity in open channels is equal to

a) 0.55

b) 0.75

c) 0.88

d) 1.75

40 / 50

40. 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

41 / 50

41. *Viscosity of a liquid

a) drops with temperature

b) rises with temperature

c) does not vary with temperature

d) remains constant up to a certain temperature

42 / 50

42. The flow in which each liquid particle has a definite path is called

a) stream line flow

b) uniform flow

c) steady flow

d) turbulent flow

43 / 50

43. *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

44 / 50

44. *Hydraulic gradient line (H.G.L.) represents the sum of

a) pressure head and kinetic head

b) kinetic head and datum head

c) pressure head, kinetic head, and datum head

d) pressure head and datum head

45 / 50

45. 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

46 / 50

46. Falling drops of water become spheres due to

a) adhesion

b) cohesion

c) surface tension

d) viscosity

47 / 50

47. *A stepped notch is a combination of

a) rectangular notches of different sizes

b) triangular notches of different sizes

c) rectangular and triangular notches

d) all of the above

48 / 50

48. If the pressure is applied to the surface of a liquid, the liquid transmits the pressure equally in all directions is given by

a) Pascal

b) Newton

c) Archimedes

d) all of the above

49 / 50

49. 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

50 / 50

50. Super-critical flow occurs in

a) normal slope

b) mild slope

c) steep slope

d) all of the above

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Hydraulics Online Test – Paper 3

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