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. *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

2 / 50

2. 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

3 / 50

3. The term z is known as

a) potential energy

b) pressure energy

c) potential energy per unit weight

d) none of the above

4 / 50

4. *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

5 / 50

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

a) silts

b) sands

c) clays

d) gravels

6 / 50

6. *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

7 / 50

7. *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

8 / 50

8. *The types of instrument used to measure low pressure with accuracy is

a) piezometer

b) barometer

c) micro manometer

d) mechanical gauge

9 / 50

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

a) energy

b) all of the above

c) mass

d) momentum

10 / 50

10. 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.

11 / 50

11. For the flow of liquid from an open-ended tube (nozzle) leading to the formation of a spray of liquid drops, the number generally is

a) Euler number

b) Froude number

c) Weber number

d) Reynolds number

12 / 50

12. *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

13 / 50

13. 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

14 / 50

14. *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

15 / 50

15. ........ is defined as the maximum increase in water level in the path of the flow of water

a) afflux

b) rising of the wall

c) flood

d) rainfall

16 / 50

16. *Surface float is used to measure

a) pressure

b) difference in pressure

c) viscosity of flow

d) none of the above

17 / 50

17. 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

18 / 50

18. *Molecules of fluids get attracted due to

a) capillary action

b) surface tension

c) adhesion

d) cohesion

19 / 50

19. *In flow, the liquid particles may possess

a) potential energy

b) kinetic energy

c) pressure energy

d) all of the above

20 / 50

20. *Water cushion is used to

a) sit in the house

b) destroy the energy

c) produce energy

d) none of the above

21 / 50

21. 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

22 / 50

22. Hydraulic gradient line and total energy line are

a) same

b) different

c) differ by pressure head

d) differ by static head

23 / 50

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

a) elevation energy

b) kinetic energy

c) pressure energy

d) none of the above

24 / 50

24. Which of the following quantities are dimensionless?

a) surface tension

b) specific weight

c) angular velocity

d) Mach number

25 / 50

25. *Bernoulli's equation is applied to

a) venturimeter

b) orifice meter

c) pitot tube

d) all of the above

26 / 50

26. 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

27 / 50

27. 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

28 / 50

28. 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

29 / 50

29. *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

30 / 50

30. 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

31 / 50

31. 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]

32 / 50

32. *If the velocity, pressure, density, etc., do not change at a point with respect to time, the flow is called

a) uniform

b) incompressible

c) non-uniform

d) steady

33 / 50

33. *The hydraulic ram is a device

a) for lifting water without an electric motor

b) for accelerating water flow

c) for lifting heavy loads

d) none of the above

34 / 50

34. 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

35 / 50

35. *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

36 / 50

36. *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

37 / 50

37. *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

38 / 50

38. *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

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. If H is the height of the liquid above the sill, the effect of end contraction on each side, according to Francis' formula, is

a) 0.1H

b) 0.2H

c) 0.3H

d) 0.4H

41 / 50

41. If the density of a fluid changes from point to point in a flow region, it is called

a) steady flow

b) unsteady flow

c) non-uniform flow

d) compressible flow

42 / 50

42. In an open channels the analysis of a sugar is done by using

a) continuity equation

b) momentum equation

c) energy equation

d) none of the above

43 / 50

43. *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

44 / 50

44. *The hydraulic radius is equal to

a) area divided by the square of the wetted perimeter

b) wetted area divided by the wetted perimeter

c) the wetted perimeter divided by the area

d) the square root of the area

45 / 50

45. *The rate of flow through a venturimeter varies as

a) H^1/2

b) H^3/2

c) H^4/2

d) H^5/2

46 / 50

46. *The energy possessed by a fluid by virtue of its existing pressure is called

a) elevation energy

b) kinetic energy

c) potential energy

d) all of the above

47 / 50

47. In an inclined position, a venturimeter records

a) less reading

b) same reading

c) more reading

d) none of the above

48 / 50

48. 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

49 / 50

49. In a flowing liquid, a particle may possess

a) potential energy

b) kinetic energy

c) pressure energy

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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