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. Velocity of flow may be determined using:

a) division of discharge to the area of flow

b) product of area and discharge divided by 100

c) product of wetted perimeter and hydraulic radius

d) all of the above

2 / 50

2. 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

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. 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

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. *The discharge through a trapezoidal channel is maximum when

a) m = d

b) m = 2d

c) m = 3d

d) m = d/2

7 / 50

7. *In flow, the liquid particles may possess

a) potential energy

b) kinetic energy

c) pressure energy

d) all of the above

8 / 50

8. 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

9 / 50

9. 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

10 / 50

10. The maximum velocity in an open channel occurs

a) at the bottom of the channel

b) at 1/2 the depth of the channel

c) slightly below the free surface

d) at the free surface

11 / 50

11. *The pressure in pipe flow is normally

a) less than atmospheric pressure

b) equal to atmospheric pressure

c) more than atmospheric pressure

d) none of the above

12 / 50

12. *Bernoulli's equation assumes that

a) fluid is non-viscous

b) fluid is homogeneous

c) flow is along the streamline

d) all of the above

13 / 50

13. 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

14 / 50

14. For a circular channel, the wetted perimeter is given by (where θ=half the angle subtended by the water at the center and R= radius of circular channel)

a) 2Rθ

b) 3Rθ

c) 4Rθ

d) all of the above

15 / 50

15. 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

16 / 50

16. 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

17 / 50

17. *The continuity equation deals with the law of conservation of

a) mass

b) momentum

c) energy

d) force

18 / 50

18. 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

19 / 50

19. 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

20 / 50

20. Liquids

a) cannot be compressed

b) do not occupy definite shape

c) are not affected by change in pressure and temperature

d) none of the above

21 / 50

21. For uniform flow in the channel

a) the total energy line, hydraulic gradient line, and the bottom of the channel are parallel

b) the total energy line and water surface are horizontal, while the bottom of the channel is inclined

c) total energy line, water surface, and the bottom of the channel are parallel

d) none of the above

22 / 50

22. Specific weight of liquid

a) remains constant at every place

b) does not remain constant at every place

c) varies from place to place

d) does not vary on any other planet except earth

23 / 50

23. 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

24 / 50

24. The water immediately downstream of the conduit or weir is called

a) head water

b) tail water

c) main water

d) surplus water

25 / 50

25. *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

26 / 50

26. The ratio of the inertia and gravitational force acting in any flow, ignoring other forces, is called

a) Euler number

b) Froude number

c) Reynolds number

d) Weber number

27 / 50

27. 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

28 / 50

28. As per our convenience which one is correct with respect to the dimensionless number?

a) WIS-MIE-RIV-FIG-EIP

b) WIE-MIS-RIV-FIG-IEP

c) MIE-WIS-RIG-FIV-PIE

d) WIG-MIS-RIE-FIV-IPE

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. 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

31 / 50

31. *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

32 / 50

32. *Which of the following statements is valid?

a) a fluid with low viscosity resists motion because its molecular structure gives it a lot of internal friction

b) viscosity describes the internal friction of a moving fluid

c) two fluids with the same dynamic viscosities have the same kinematic viscosities irrespective of their densities

d) intensity of liquid pressure at the bottom of a tank is w.g.h/3

33 / 50

33. Reynolds number is the ratio of initial force and

a) viscosity

b) elasticity

c) gravitational force

d) surface tension

34 / 50

34. *The main assumption of Bernoulli's equation is

a) the velocity of energy of liquid particles across any cross-section of a pipe is uniform

b) no external force except gravity acts on the liquid

c) there is no loss of energy of the liquid while flowing

d) all of the above

35 / 50

35. Mach number is the ratio of inertia force to

a) viscosity

b) Froude number

c) gravitational force

d) elasticity

36 / 50

36. 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

37 / 50

37. From a nozzle exposed to the atmosphere, the liquid jet traverses

a) a straight line

b) a circular path

c) a parabolic path

d) an elliptical path

38 / 50

38. *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

39 / 50

39. *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

40 / 50

40. 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

41 / 50

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

a) elevation energy

b) kinetic energy

c) pressure energy

d) none of the above

42 / 50

42. Super-critical flow occurs in

a) normal slope

b) mild slope

c) steep slope

d) all of the above

43 / 50

43. 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

44 / 50

44. *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

45 / 50

45. 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

46 / 50

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

a) 30°

b) 60°

c) 90°

d) 120°

47 / 50

47. 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

48 / 50

48. 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

49 / 50

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

a) maximum

b) zero

c) unpredictable

d) none of the above

50 / 50

50. *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

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Hydraulics Online Test – Paper 3

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