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. *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

2 / 50

2. Water belongs to

a) compressible fluids

b) none of the above

c) Newtonian fluids

d) non-Newtonian fluids

3 / 50

3. *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

4 / 50

4. 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

5 / 50

5. 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

6 / 50

6. *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

7 / 50

7. 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

8 / 50

8. The error 1% in measuring H will produce a

a) 1%

b) 1.5%

c) 2%

d) 2.5%

9 / 50

9. When the pipes are connected in parallel, the total loss of head

a) is equal to the sum of the loss of head in each pipe

b) is the same as in each pipe

c) is equal to the reciprocal of the sum of the loss of head in each pipe

d) none of the above

10 / 50

10. 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

11 / 50

11. 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

12 / 50

12. *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

13 / 50

13. *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

14 / 50

14. Critical depth (he) is given by (where q= rate of flow per unit width of channel)

a) (q^2/g)^1/3

b) (q^2/g)^1/4

c) (q^2/g)^1/2

d) none of the above

15 / 50

15. 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

16 / 50

16. 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

17 / 50

17. *The atmospheric pressure varies with

a) altitude

b) temperature

c) weather conditions

d) none of the above

18 / 50

18. 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

19 / 50

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

a) 50%

b) 60%

c) 66%

d) 76%

20 / 50

20. *Venturimeter is used to measure

a) rate of flow

b) velocity

c) depth of flow

d) all of the above

21 / 50

21. The total energy of a liquid in motion is equal to:

a) pressure energy + kinetic energy + potential energy

b) pressure energy - (kinetic energy + potential energy)

c) potential energy - (pressure energy + kinetic energy)

d) kinetic energy - (pressure energy + potential energy)

22 / 50

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

a) maximum

b) zero

c) unpredictable

d) none of the above

23 / 50

23. *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

24 / 50

24. Specific weight of sea water is more than that of pure water because of

a) dissolved air

b) dissolved salts

c) suspended matter

d) all of the above

25 / 50

25. 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

26 / 50

26. *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

27 / 50

27. 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

28 / 50

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

a) 30°

b) 60°

c) 90°

d) 120°

29 / 50

29. 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

30 / 50

30. *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

31 / 50

31. 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

32 / 50

32. *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

33 / 50

33. Hydraulic gradient line for an open flow channel is

a) below water level

b) same as water level

c) above water level

d) all of the above

34 / 50

34. *To measure atmospheric pressure, we use

a) barometers

b) piezometer

c) manometers

d) differential manometers

35 / 50

35. 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

36 / 50

36. *Cavitations is caused by

a) low pressure

b) high pressure

c) low velocity

d) high velocity

37 / 50

37. *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

38 / 50

38. A siphon is used

a) to connect water reservoirs at different levels intervened by a hill

b) to supply water to a town from a higher level to a lower level

c) to fill up a tank with water at a higher level from a lower level

d) none of the above

39 / 50

39. *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

40 / 50

40. 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

41 / 50

41. 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

42 / 50

42. Gauge pressure is

a) absolute - atmosphere

b) absolute + atmosphere

c) atmospheric ± absolute

d) none of the above

43 / 50

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

a) elevation energy

b) kinetic energy

c) pressure energy

d) none of the above

44 / 50

44. Super-critical flow occurs in

a) normal slope

b) mild slope

c) steep slope

d) all of the above

45 / 50

45. 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

46 / 50

46. The two depths at which the specific energy is the same are called

a) alternate depths

b) conjugate depths

c) critical depths

d) normal depths

47 / 50

47. The minimum head loss will occur in

a) orifice meter

b) venturimeter

c) nozzle meter

d) none of the above

48 / 50

48. *The flow in which the path of individual particles of liquid cross each other is called

a) uniform flow

b) turbulent flow

c) stream line flow

d) none of the above

49 / 50

49. 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

50 / 50

50. *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

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