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 upper surface of the notch over which water flows is known as

a) vein

b) nappe

c) sill

d) none of the above

2 / 50

2. The viscosity of liquids varies with temperature

a) directly proportional

b) inversely proportional

c) constant

d) none of the above

3 / 50

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

a) m = d

b) m = 2d

c) m = 3d

d) m = d/2

4 / 50

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

a) twice

b) thrice

c) same

d) all of the above

5 / 50

5. 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

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. *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

8 / 50

8. *Pressure head is given by

a) P/w

b) z

c) v/2g

d) all

9 / 50

9. *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

10 / 50

10. *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

11 / 50

11. *The total pressure force on a plane area is equal to the area multiplied by the intensity of pressure at its centroid if

a) the area is horizontal

b) the area is vertical

c) the area is inclined

d) all of the above

12 / 50

12. Hydrostatic pressure on a dam depends upon its

a) length

b) depth

c) shape

d) both (b) and (c) of the above

13 / 50

13. 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

14 / 50

14. 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

15 / 50

15. 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

16 / 50

16. In an inclined position, a venturimeter records

a) less reading

b) same reading

c) more reading

d) none of the above

17 / 50

17. Cavitations in flowing fluid occurs when

a) the total energy suddenly increases

b) the total energy suddenly decreases

c) the total energy is constant

d) none of the above

18 / 50

18. "Manning's formula is used for

a) flow in open channels

b) head loss due to friction in open channels

c) head loss due to friction in pipes flowing full

d) flow in pipes

19 / 50

19. *Cavitations is caused by

a) low pressure

b) high pressure

c) low velocity

d) high velocity

20 / 50

20. Find the capillary rise/fall in a glass tube when immersed in mercury with the following given data: surface tension, σ = 0.52 gmf/cm, angle of contact, θ = 130°, S.G. of mercury = 13.6, diameter of the pipe = 2.5 mm.

a) 0.393 cm rise

b) 0.393 cm fall

c) neither fall nor rise

d) all of the above

21 / 50

21. 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

22 / 50

22. *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

23 / 50

23. *The difference between the total energy gradient line and the total energy line is

a) kinetic head

b) pressure head

c) datum head

d) loss of head

24 / 50

24. The upward water pressure at the base of the structure is called

a) up

b) down

c) uplist

d) downlift

25 / 50

25. 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

26 / 50

26. *If the velocity of fluid particles varies from point to point in magnitude and direction, as well as from instant to instant, the flow is said to be

a) laminar

b) turbulent flow

c) uniform flow

d) non-uniform flow

27 / 50

27. 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

28 / 50

28. Falling drops of water become spheres due to

a) adhesion

b) cohesion

c) surface tension

d) viscosity

29 / 50

29. 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

30 / 50

30. *Which of the following statements is valid?

a) a fluid with low viscosity resists motion because its molecular structure gives it a lot of internal friction

b) viscosity describes the internal friction of a moving fluid

c) two fluids with the same dynamic viscosities have the same kinematic viscosities irrespective of their densities

d) intensity of liquid pressure at the bottom of a tank is w.g.h/3

31 / 50

31. 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

32 / 50

32. 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

33 / 50

33. 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

34 / 50

34. 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

35 / 50

35. 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

36 / 50

36. 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

37 / 50

37. Water belongs to

a) compressible fluids

b) none of the above

c) Newtonian fluids

d) non-Newtonian fluids

38 / 50

38. One horsepower is equal to

a) 1 kW

b) 0.746 kW

c) 0.836 kW

d) 0.756 kW

39 / 50

39. *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

40 / 50

40. Super-critical flow occurs in

a) normal slope

b) mild slope

c) steep slope

d) all of the above

41 / 50

41. *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

42 / 50

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

a) 1/2

b) 2/3

c) 3/2

d) 3/4

43 / 50

43. *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

44 / 50

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

a) 30°

b) 60°

c) 90°

d) 120°

45 / 50

45. *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

46 / 50

46. The phenomenon of rising of a liquid surface in a tube of small diameter relative to the adjacent normal level of the liquid is known as

a) capillary rise

b) capillary fall

c) rising

d) none of the above

47 / 50

47. *A pitot tube is used to measure

a) pressure

b) different in pressure

c) velocity of flow

d) none of the above

48 / 50

48. 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

49 / 50

49. 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

50 / 50

50. *The hydraulic radius is equal to

a) area divided by the square of the wetted perimeter

b) wetted area divided by the wetted perimeter

c) the wetted perimeter divided by the area

d) the square root of the area

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