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. *The specific weight of water 1000 kg/m^3

a) at normal pressure of 760 mm

b) at 4°C temperature

c) at mean sea level

d) all of the above

2 / 50

2. 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

3 / 50

3. A fluid particle may possess the displacement of

a) translation

b) rotation

c) distortion

d) all of the above

4 / 50

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

a) more

b) less

c) equal

d) not defined

5 / 50

5. If the total head of the nozzle of a pipe is 37.5m and the discharge is 1 cubic meter per second, then the power generated is

a) 500 HP

b) 550 HP

c) 400 HP

d) 450 HP

6 / 50

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

a) maximum

b) zero

c) unpredictable

d) none of the above

7 / 50

7. 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

8 / 50

8. 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

9 / 50

9. In an inclined position, a venturimeter records

a) less reading

b) same reading

c) more reading

d) none of the above

10 / 50

10. *The orifice used for low discharge is

a) rectangular

b) circular

c) square

d) triangular

11 / 50

11. The capillary rise or fall of the liquid is given by

a) h = σ cos θ / 4ρgd

b) h = 4σ cos θ / ρgd

c) h = 8σ cos θ / ρgd

d) none of the above

12 / 50

12. *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

13 / 50

13. *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

14 / 50

14. *1 m head is equivalent to

a) 0.1 kg/cm^2

b) 0.2 kg/cm^2

c) 0.3 kg/cm^2

d) 0.4 kg/cm^2

15 / 50

15. The viscosity of gases varies with temperature

a) directly proportional

b) inversely proportional

c) constant

d) none of the above

16 / 50

16. A triangular notch is preferred to a rectangular notch because

a) only one reading is required

b) its formula is simple to remember

c) it gives more accurate results for low discharge (Q≤100m^3/sec)

d) it measures a wide range of flows accurately

17 / 50

17. *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

18 / 50

18. *If the volume of a liquid weighing 2400 kg is 3 cubic meters, then 0.8 is its:

a) specific weight

b) specific mass

c) specific gravity

d) none of the above

19 / 50

19. *Water cushion is used to

a) sit in the house

b) destroy the energy

c) produce energy

d) none of the above

20 / 50

20. *Orifice-meter is used to measure:

a) pressure at the point

b) discharge

c) average speed

d) velocity

21 / 50

21. 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

22 / 50

22. 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.

23 / 50

23. *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

24 / 50

24. If the forces are due to inertia and gravity, and frictional resistance plays only a minor role, the design of channels is made by comparing

a) Reynold number

b) Froude number

c) Weber number

d) Mach number

25 / 50

25. In an open tube, the free surface of mercury remains

a) horizontal

b) curved upwards

c) curved downwards

d) none of the above

26 / 50

26. 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

27 / 50

27. 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

28 / 50

28. If the Froude number in open channel flow is equal to 1.0, the flow is called

a) critical flow

b) streaming flow

c) shooting flow

d) none of the above

29 / 50

29. Liquids or fluids

a) have no shape

b) cannot be compressed

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

d) none of the above

30 / 50

30. 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

31 / 50

31. 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

32 / 50

32. 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

33 / 50

33. *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

34 / 50

34. 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

35 / 50

35. 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

36 / 50

36. *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

37 / 50

37. *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

38 / 50

38. *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

39 / 50

39. *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

40 / 50

40. *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

41 / 50

41. 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

42 / 50

42. *A pitot tube is used to measure

a) pressure

b) different in pressure

c) velocity of flow

d) none of the above

43 / 50

43. 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

44 / 50

44. 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

45 / 50

45. A substance which deforms continuously under the action of shear stress is called

a) fluid

b) liquid

c) solid

d) gas

46 / 50

46. *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

47 / 50

47. *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

48 / 50

48. The pressure less than atmospheric pressure is known as

a) suction pressure

b) vacuum pressure

c) negative pressure

d) all of the above

49 / 50

49. *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

50 / 50

50. *The term v^2/2g is known as

a) kinetic energy

b) pressure energy

c) kinetic energy per unit weight

d) none of the above

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