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 magnitude of water hammer depends upon

a) the length of the pipeline

b) elastic properties of liquid

c) elastic properties of the pipe material

d) diameter of the pipeline

2 / 50

2. *The atmospheric pressure varies with

a) altitude

b) temperature

c) weather conditions

d) none of the above

3 / 50

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

a) H

b) H1/2

c) H3/2

d) H5/2

4 / 50

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

a) maximum

b) zero

c) unpredictable

d) none of the above

5 / 50

5. *Rotameter is used for measuring

a) density of fluids

b) value of fluids in a pipe

c) discharge of fluids

d) pressure in fluids

6 / 50

6. 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

7 / 50

7. *A pitot tube is used to measure

a) pressure

b) different in pressure

c) velocity of flow

d) none of the above

8 / 50

8. *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

9 / 50

9. Falling drops of water become spheres due to

a) adhesion

b) cohesion

c) surface tension

d) viscosity

10 / 50

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

a) 1%

b) 1.5%

c) 2%

d) 2.5%

11 / 50

11. 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

12 / 50

12. 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

13 / 50

13. 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

14 / 50

14. *Surface tension is the force

a) per unit length

b) per unit area

c) per unit volume

d) all of the above

15 / 50

15. *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

16 / 50

16. 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

17 / 50

17. 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

18 / 50

18. *Hydraulic gradient is equal to

a) difference in water surface / total length of the channel

b) total loss due to friction / total length of the channel

c) wetted perimeter / total length of the channel

d) area of cross-section / total length of the channel

19 / 50

19. 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

20 / 50

20. Water hammer is a phenomenon that occurs

a) when pressure increases sudden closure of the valve

b) when pressure decreases sudden opening of the valve

c) due to the elastic material of the pipe

d) due to the incompressible nature of the fluid

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. *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

23 / 50

23. 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

24 / 50

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

a) plasticity

b) viscosity

c) compressibility

d) none of the above

25 / 50

25. In an open channel flow

a) the velocity distribution is symmetrical about the pipe axis

b) the maximum velocity occurs at a little distance below the water surface

c) flow cross-section is fixed

d) the flow takes place at the expense of hydraulic pressure

26 / 50

26. *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

27 / 50

27. 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

28 / 50

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

a) fluid

b) liquid

c) solid

d) gas

29 / 50

29. *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

30 / 50

30. *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

31 / 50

31. *The orifice used for low discharge is

a) rectangular

b) circular

c) square

d) triangular

32 / 50

32. 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

33 / 50

33. *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

34 / 50

34. *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

35 / 50

35. *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

36 / 50

36. *Cavitations is caused by

a) low pressure

b) high pressure

c) low velocity

d) high velocity

37 / 50

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

a) horizontal

b) curved upwards

c) curved downwards

d) none of the above

38 / 50

38. *Cipolletti weir is a trapezoidal weir having a side slope of

a) H:V::1:2

b) H:V::2:1

c) H:V::1:4

d) none of the above

39 / 50

39. 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

40 / 50

40. In a venturimeter, the divergent cone is kept

a) shorter than the convergent cone

b) longer than the convergent cone

c) equal to the convergent cone

d) none of the above

41 / 50

41. *Piezometers 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

42 / 50

42. 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

43 / 50

43. In the case of a broad-crested weir, the depth of water h at the end of the still is given by

a) h = H/2

b) h = 2H/3

c) h = 3H/4

d) h = H

44 / 50

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

a) m = d

b) m = 2d

c) m = 3d

d) m = d/2

45 / 50

45. The term P/pg is known as

a) kinetic energy

b) pressure energy per unit weight

c) kinetic energy per unit weight

d) none of the above

46 / 50

46. *The float method is used to measure

a) the discharge in an open channel

b) the velocity in an open channel

c) discharge open in an open channel

d) all of the above

47 / 50

47. *Orifice-meter is used to measure:

a) pressure at the point

b) discharge

c) average speed

d) velocity

48 / 50

48. *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

49 / 50

49. 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

50 / 50

50. 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

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