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. Hydraulic gradient line and total energy line are

a) same

b) different

c) differ by pressure head

d) differ by static head

2 / 50

2. The flow in which each liquid particle has a definite path is called

a) stream line flow

b) uniform flow

c) steady flow

d) turbulent flow

3 / 50

3. *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

4 / 50

4. Total head of a particle in motion is the sum of

a) potential head and kinetic head

b) kinetic head and pressure head

c) potential head and pressure head

d) potential head, kinetic head, and pressure head

5 / 50

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

a) up

b) down

c) uplist

d) downlift

6 / 50

6. 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

7 / 50

7. "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

8 / 50

8. 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

9 / 50

9. If the Froude number in open channel flow is more than 1.0, the flow is called

a) critical flow

b) streaming flow

c) shooting flow

d) none of the above

10 / 50

10. The viscosity of liquids varies with temperature

a) directly proportional

b) inversely proportional

c) constant

d) none of the above

11 / 50

11. *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

12 / 50

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

a) vein

b) nappe

c) sill

d) none of the above

13 / 50

13. *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

14 / 50

14. *The wetted perimeter of a channel is given by

a) 4.75Q^2

b) 4.75Q

c) 4.75√Q

d) none of the above

15 / 50

15. Flow in pipes is turbulent if the Reynolds number is

a) less than 2100

b) more than 3000

c) between 2100 and 3000

d) none of the above

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. *Chazy's formula is given by

a) v = C√mi

b) v = m√ci

c) v = C√mci

d) v = i√mc

18 / 50

18. 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

19 / 50

19. In the case of vortex flow, the level of water at the center is

a) higher than circumference

b) lower than circumference

c) same as circumference

d) all of the above

20 / 50

20. Head loss due to friction in a pipe is given by the Darcy-Weisbach equation

a) h_f = 4fLV^2/2gd

b) h_f = fLV^2/2gd

c) h_f = 0.5V^2 / 2g

d) h_f = (v_1-v_2)^2 / 2g

21 / 50

21. 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

22 / 50

22. 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

23 / 50

23. *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

24 / 50

24. A siphon is an

a) L-shaped pipe

b) U-shaped pipe

c) inverted U-shaped pipe

d) all of the above

25 / 50

25. A triangular notch is preferred to a rectangular notch because

a) only one reading is required

b) its formula is simple to remember

c) it gives more accurate results for low discharge (Q≤100m^3/sec)

d) it measures a wide range of flows accurately

26 / 50

26. For the flow of liquid from an open-ended tube (nozzle) leading to the formation of a spray of liquid drops, the number generally is

a) Euler number

b) Froude number

c) Weber number

d) Reynolds number

27 / 50

27. 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

28 / 50

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

a) vein

b) nappe

c) sill

d) none of the above

29 / 50

29. 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

30 / 50

30. The term z is known as

a) potential energy

b) pressure energy

c) potential energy per unit weight

d) none of the above

31 / 50

31. *Rotameter is used for measuring

a) density of fluids

b) value of fluids in a pipe

c) discharge of fluids

d) pressure in fluids

32 / 50

32. Cavitations is collapsed by

a) low pressure

b) high pressure

c) low velocity

d) high velocity

33 / 50

33. *Orifice-meter is used to measure:

a) pressure at the point

b) discharge

c) average speed

d) velocity

34 / 50

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

a) 30°

b) 60°

c) 90°

d) 120°

35 / 50

35. The pressure difference between inside and outside of a droplet of water is given by (Where σ is surface tension and d is the diameter of the droplet.)

a) 2σ/d

b) 4σ/d

c) 6σ/d

d) 8σ/d

36 / 50

36. From a nozzle exposed to the atmosphere, the liquid jet traverses

a) a straight line

b) a circular path

c) a parabolic path

d) an elliptical path

37 / 50

37. *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

38 / 50

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

a) twice

b) thrice

c) same

d) all of the above

39 / 50

39. 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

40 / 50

40. Liquids

a) cannot be compressed

b) do not occupy definite shape

c) are not affected by change in pressure and temperature

d) none of the above

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. The ratio of the mean velocity to the surface velocity in open channels is equal to

a) 0.55

b) 0.75

c) 0.88

d) 1.75

43 / 50

43. *Capillary rise is proportional to

a) surface tension

b) unit weight of water

c) diameter of the pipe

d) none of the above

44 / 50

44. Poise is the unit of

a) mass density

b) kinematic viscosity

c) viscosity

d) pressure gradient

45 / 50

45. 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

46 / 50

46. *Pascal's law states that pressure at a point is equal in all directions

a) in a liquid at rest

b) in a fluid at rest

c) in a laminar flow

d) in a turbulent flow

47 / 50

47. *Molecules of fluids get attracted due to

a) capillary action

b) surface tension

c) adhesion

d) cohesion

48 / 50

48. *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

49 / 50

49. *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

50 / 50

50. 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

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