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. 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

2 / 50

2. The term z is known as

a) potential energy

b) pressure energy

c) potential energy per unit weight

d) none of the above

3 / 50

3. *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

4 / 50

4. Crest of a weir is lower than d/s water level

a) submerged weir

b) Cipolletti weir

c) triangular weir

d) sharp-crested weir

5 / 50

5. With a clinging nappe of a weir, the excess discharge is

a) 6% to 7%

b) 8% to 10%

c) 12% to 15%

d) 25% to 30%

6 / 50

6. 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

7 / 50

7. 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

8 / 50

8. 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

9 / 50

9. 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

10 / 50

10. *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

11 / 50

11. *An ideal flow of a liquid obeys

a) continuity equation

b) Newton's second law of viscosity

c) Newton's second law of motion

d) dynamic viscosity

12 / 50

12. *The atmospheric pressure varies with

a) altitude

b) temperature

c) weather conditions

d) none of the above

13 / 50

13. 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

14 / 50

14. Which of the following is the example of laminar flow?

a) underground flow

b) flow past tiny bodies

c) both of (a) and (b)

d) none of the above

15 / 50

15. *Capillary rise is proportional to

a) surface tension

b) unit weight of water

c) diameter of the pipe

d) none of the above

16 / 50

16. *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

17 / 50

17. *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

18 / 50

18. The hydrostatic force exerted by 2 m deep water on the gate downstream is equal to

a) 40 kN

b) 10 kN

c) 20 kN

d) 30 kN

19 / 50

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

a) fluid

b) liquid

c) solid

d) gas

20 / 50

20. *Cipolleti weir is a

a) rectangular weir whose length is kept 3 times the height of the water above the sill

b) triangular weir, whose notch angle is 90°

c) trapezoidal weir, whose sides slope 1 horizontal to 4 verticals

d) a combination of rectangular and triangular weirs

21 / 50

21. *Orifice-meter is used to measure:

a) pressure at the point

b) discharge

c) average speed

d) velocity

22 / 50

22. The inlet length of a venturimeter

a) is equal to the outlet length

b) is more than the outlet length

c) is less than the outlet length

d) none of the above

23 / 50

23. *Pressure within a soap bubble is

a) equal to vapor pressure

b) less than external pressure

c) more than external pressure

d) equal to external pressure

24 / 50

24. *The orifice used for low discharge is

a) rectangular

b) circular

c) square

d) triangular

25 / 50

25. *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

26 / 50

26. The pressure less than atmospheric pressure is known as

a) suction pressure

b) vacuum pressure

c) negative pressure

d) all of the above

27 / 50

27. 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

28 / 50

28. *The magnitude of capillary rise is more in:

a) silts

b) sands

c) clays

d) gravels

29 / 50

29. 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

30 / 50

30. The viscosity of gases varies with temperature

a) directly proportional

b) inversely proportional

c) constant

d) none of the above

31 / 50

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

a) H

b) H1/2

c) H3/2

d) H5/2

32 / 50

32. *Cavitations is caused by

a) low pressure

b) high pressure

c) low velocity

d) high velocity

33 / 50

33. The head of water representing in the case of HGL line is known as

a) static head

b) residual head

c) pressure head

d) all of the above

34 / 50

34. Specific energy of a flowing fluid per unit weight is equal to

a) (v^2/2g) + h

b) (h^2/2g) + v

c) (v^2/2h) + g

d) (v^2/3g) + h

35 / 50

35. *Uniform flow is said to occur when

a) the size and shape of the cross-section in a particular length remain constant

b) the size and shape of the cross-section change along a length

c) the frictional loss in the particular length of the channel will be more than the drop in elevation

d) the frictional loss in the particular length of the channel will be less than the drop in elevation

36 / 50

36. 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

37 / 50

37. *What affects the quantity of mass of a fluid?

a) acceleration due to gravity

b) distance from the center of the earth

c) elevation of the body

d) none of the above

38 / 50

38. If the velocity in a fluid flow changes with respect to the length of the direction of the flow, it is called

a) unsteady flow

b) compressible flow

c) rotational flow

d) none of the above

39 / 50

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

a) maximum

b) zero

c) unpredictable

d) none of the above

40 / 50

40. *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

41 / 50

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

a) unsteady

b) non-uniform

c) turbulent

d) incompressible

42 / 50

42. 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

43 / 50

43. The thickness of a sharp-crested weir is kept less than

a) one-third of the height of water on the sill

b) one-half of the height of water on the sill

c) two-thirds of the height of water on the sill

d) four-thirds of the height of water on the sill

44 / 50

44. *To measure atmospheric pressure, we use

a) barometers

b) piezometer

c) manometers

d) differential manometers

45 / 50

45. Super-critical flow occurs in

a) normal slope

b) mild slope

c) steep slope

d) all of the above

46 / 50

46. If the density of a fluid is constant from point to point in a flow region, it is called

a) steady flow

b) incompressible flow

c) uniform flow

d) rotational flow

47 / 50

47. 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

48 / 50

48. *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

49 / 50

49. Poise is the unit of

a) mass density

b) kinematic viscosity

c) viscosity

d) pressure gradient

50 / 50

50. 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

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