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. *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

2 / 50

2. 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

3 / 50

3. *To measure atmospheric pressure, we use

a) barometers

b) piezometer

c) manometers

d) differential manometers

4 / 50

4. Discharge over an ogee weir remains the same as that of

a) sharp-crested weir

b) triangular weir

c) Cipolleti weir

d) drowned weir

5 / 50

5. 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

6 / 50

6. For any channel section, the specific energy increase with

a) decreases in depth of super critical flow

b) increases in depth of super critical flow

c) increases in depth of sub critical flow

d) none of the above

7 / 50

7. 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

8 / 50

8. The most economical section of a circular channel for the maximum discharge is when

a) depth of water = 0.95 diameter of the circular section

b) hydraulic mean depth = 0.286 diameter of the circular section

c) wetted perimeter = 2.6 diameters of the circular section

d) all of the above

9 / 50

9. *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

10 / 50

10. 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

11 / 50

11. Hydraulic gradient line and total energy line are

a) same

b) different

c) differ by pressure head

d) differ by static head

12 / 50

12. Euler's number is the ratio of

a) inertia force to pressure force

b) pressure force to elastic force

c) elastic force to viscous force

d) viscous force to inertia force

13 / 50

13. *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

14 / 50

14. *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

15 / 50

15. *Orifice-meter is used to measure:

a) pressure at the point

b) discharge

c) average speed

d) velocity

16 / 50

16. In an inclined pipe, the pressure difference at its two ends is due to

a) sudden head drop at the inlet

b) exit head drop

c) frictional loss head

d) all of the above

17 / 50

17. *The floating method is used for the measurement of

a) discharge

b) head

c) pressure

d) none of the above

18 / 50

18. *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

19 / 50

19. Weber number is the ratio of inertia force to

a) surface tension

b) gravitational force

c) elasticity

d) viscosity

20 / 50

20. 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.

21 / 50

21. *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

22 / 50

22. 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

23 / 50

23. The term z is known as

a) potential energy

b) pressure energy

c) potential energy per unit weight

d) none of the above

24 / 50

24. Gauge pressure is

a) absolute - atmosphere

b) absolute + atmosphere

c) atmospheric ± absolute

d) none of the above

25 / 50

25. *Venturimeter is used to measure

a) rate of flow

b) velocity

c) depth of flow

d) all of the above

26 / 50

26. *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

27 / 50

27. *Cavitations is caused by

a) low pressure

b) high pressure

c) low velocity

d) high velocity

28 / 50

28. 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

29 / 50

29. *Water cushion is used to

a) sit in the house

b) destroy the energy

c) produce energy

d) none of the above

30 / 50

30. *An orifice is called a large orifice if the water head is

a) two times the diameter of the pipe

b) three times the diameter of the pipe

c) four times the diameter of the pipe

d) five times the diameter of the pipe

31 / 50

31. Liquids or fluids

a) have no shape

b) cannot be compressed

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

d) none of the above

32 / 50

32. The ratio of the percentage error in the discharge and the percentage error in the measurement of head over a triangular notch is

a) 2/3

b) 3/2

c) 2/5

d) 5/2

33 / 50

33. 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

34 / 50

34. *The rate of flow through a V-notch varies as:

a) H

b) H1/2

c) H3/2

d) H5/2

35 / 50

35. 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

36 / 50

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

a) head water

b) tail water

c) main water

d) surplus water

37 / 50

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

a) unsteady

b) non-uniform

c) turbulent

d) incompressible

38 / 50

38. *The upper surface of the weir over which water flows is known as:

a) vein

b) nappe

c) sill

d) none of the above

39 / 50

39. 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

40 / 50

40. The viscosity of liquids varies with temperature

a) directly proportional

b) inversely proportional

c) constant

d) none of the above

41 / 50

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

a) 50%

b) 60%

c) 66%

d) 76%

42 / 50

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

a) more

b) less

c) equal

d) not defined

43 / 50

43. *The condition for the maximum velocity and discharge is given by (closed flow)

a) 0.81D & 0.95D

b) 0.82D & 0.94D

c) 0.83D & 0.93D

d) 0.84D & 0.92D

44 / 50

44. *The upper surface of the notch over which water flows is known as

a) vein

b) nappe

c) sill

d) none of the above

45 / 50

45. 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

46 / 50

46. *Surface tension is the force

a) per unit length

b) per unit area

c) per unit volume

d) all of the above

47 / 50

47. *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

48 / 50

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

a) energy

b) all of the above

c) mass

d) momentum

49 / 50

49. The viscosity of gases varies with temperature

a) directly proportional

b) inversely proportional

c) constant

d) none of the above

50 / 50

50. 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

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