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

a) maximum

b) zero

c) unpredictable

d) none of the above

2 / 50

2. 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

3 / 50

3. *Viscosity of a liquid

a) drops with temperature

b) rises with temperature

c) does not vary with temperature

d) remains constant up to a certain temperature

4 / 50

4. 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

5 / 50

5. ........ 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

6 / 50

6. Rotation is defined as the movement of a fluid element in such a way that both of its axes rotate in...

a) the same direction

b) different directions

c) both of the above

d) none of the above

7 / 50

7. 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

8 / 50

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

a) energy

b) all of the above

c) mass

d) momentum

9 / 50

9. 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

10 / 50

10. 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

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 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]

13 / 50

13. Weber number is the ratio of inertia force to

a) surface tension

b) gravitational force

c) elasticity

d) viscosity

14 / 50

14. *If fluid or flow parameters at any given instant remain the same at every point in space, it is called:

a) steady flow

b) laminar flow

c) uniform flow

d) rotational flow

15 / 50

15. *The discharge through a trapezoidal channel is maximum when

a) m = d

b) m = 2d

c) m = 3d

d) m = d/2

16 / 50

16. 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

17 / 50

17. 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

18 / 50

18. 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

19 / 50

19. 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

20 / 50

20. *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

21 / 50

21. 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

22 / 50

22. *The phenomenon occurring in an open channel when a rapidly flowing stream abruptly changes to a slowly flowing stream, causing a distinct rise of the liquid surface, is

a) water hammer

b) hydraulic jump

c) critical discharge

d) all of the above

23 / 50

23. *If a pitot tube is placed with its nose facing sideways, the liquid

a) rises in the tube

b) falls in the tube

c) neither rises nor falls in the tube

d) all of the above

24 / 50

24. The attraction among different particles of the same material is

a) adhesion

b) cohesion

c) corrosion

d) fusion

25 / 50

25. *Variation in volume of liquid with variation in pressure is called

a) plasticity

b) viscosity

c) compressibility

d) none of the above

26 / 50

26. In an inclined position, a venturimeter records

a) less reading

b) same reading

c) more reading

d) none of the above

27 / 50

27. The viscosity of gases varies with temperature

a) directly proportional

b) inversely proportional

c) constant

d) none of the above

28 / 50

28. *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

29 / 50

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

a) vein

b) nappe

c) sill

d) none of the above

30 / 50

30. *The rise of the water table, which takes place due to the transformation of the unstable shooting flow (super-critical) to the stable streaming is called

a) hydraulic jump

b) standing wave

c) both (a) and (b) above

d) water cushion

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. *Head loss increases with

a) an increase in velocity

b) a decrease in velocity

c) a decrease in length of the pipe

d) an increase in the diameter of the pipe

33 / 50

33. *Surface tension is the force

a) per unit length

b) per unit area

c) per unit volume

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. For a long pipe, the head loss

a) at the entrance is ignored

b) at the outlet is ignored

c) at the entrance and outlet both are ignored

d) due to friction is ignored

36 / 50

36. 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

37 / 50

37. The numerical value of vorticity is.....of the rotation

a) twice

b) thrice

c) same

d) all of the above

38 / 50

38. 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

39 / 50

39. 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.

40 / 50

40. To avoid an interruption in the flow of a siphon, the air vessel is provided

a) at the inlet

b) at the outlet

c) at the summit

d) at the point between the inlet and outlet

41 / 50

41. *The hydraulic ram is a pump that works on

a) the principle of water hammer

b) the principle of centrifugal action

c) the principle of reciprocation action

d) all of the above

42 / 50

42. Mass density of liquid (p) is given by

a) p = mass/volume

b) p = metric slug/m^2

c) p = kgsec^3/m^4

d) all of the above

43 / 50

43. *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

44 / 50

44. *Capillarity of water is

a) directly proportional to surface tension

b) inversely proportional to the angle of contact

c) inversely proportional to the diameter of the pipe

d) all of the above

45 / 50

45. *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

46 / 50

46. *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

47 / 50

47. *If the volume of liquid weighing 3000 kg is 4 cubic meters, then the specific gravity is

a) 750 kg/m^3

b) 12000 kg/m^3

c) 1.33

d) 0.75

48 / 50

48. *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

49 / 50

49. The Manning's formula for flow in an open channel is given by

a) v = n R^2/3 S^1/2

b) none of the above

c) v = 1/n R^2/3 S^1/2

d) v = 1/n R^1/2 S^2/3

50 / 50

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

a) mass

b) momentum

c) energy

d) force

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