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. 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

2 / 50

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

a) H

b) H1/2

c) H3/2

d) H5/2

3 / 50

3. For the same specific force, the two depths at which the same discharge occurs are called

a) alternate depths

b) conjugate depths

c) critical depths

d) normal depths

4 / 50

4. *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

5 / 50

5. 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

6 / 50

6. The two depths at which the specific energy is the same are called

a) alternate depths

b) conjugate depths

c) critical depths

d) normal depths

7 / 50

7. The total energy of a liquid in motion is equal to:

a) pressure energy + kinetic energy + potential energy

b) pressure energy - (kinetic energy + potential energy)

c) potential energy - (pressure energy + kinetic energy)

d) kinetic energy - (pressure energy + potential energy)

8 / 50

8. *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

9 / 50

9. 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

10 / 50

10. *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

11 / 50

11. 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

12 / 50

12. *The most economical section of a circular channel for the maximum velocity is when

a) depth of water = 0.810 diameter

b) hydraulic mean depth = 0.304 diameter of the circular section

c) wetted perimeter = 2.245 diameters of the circular section

d) all of the above

13 / 50

13. To ensure that water does not rise more than 100 cm above the crest, for a discharge of 5.00 m^3/sec, the length of the weir will be (Cd = 0.62)

a) 2.48 m

b) 2.73 m

c) 2.50 m

d) 2.51 m

14 / 50

14. 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

15 / 50

15. If the volume of a liquid weighing 3000 kg is 4 cubic meters, then 0.75 is its

a) specific weight

b) specific mass

c) specific gravity

d) none of the above

16 / 50

16. ........ 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

17 / 50

17. The basic head loss in a long pipe is:

a) fittings

b) sudden increase in diameter

c) sudden decrease in diameter

d) friction

18 / 50

18. "Maximum efficiency of power transmission through a pipe is

a) 50%

b) 60%

c) 66%

d) 76%

19 / 50

19. *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

20 / 50

20. *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

21 / 50

21. *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

22 / 50

22. *Venturimeter is used to measure

a) rate of flow

b) velocity

c) depth of flow

d) all of the above

23 / 50

23. 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

24 / 50

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

a) submerged weir

b) Cipolletti weir

c) triangular weir

d) sharp-crested weir

25 / 50

25. 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

26 / 50

26. If the pressure is applied to the surface of a liquid, the liquid transmits the pressure equally in all directions is given by

a) Pascal

b) Newton

c) Archimedes

d) all of the above

27 / 50

27. An intensifier is used to increase

a) pressure

b) temperature

c) energy

d) none of the above

28 / 50

28. *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

29 / 50

29. *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

30 / 50

30. 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.

31 / 50

31. The discharge through a V-notch weir is directly proportional to:

a) the bed slope of the channel upstream

b) the depth of flow

c) the top width of the notch

d) the angle of the notch and the depth of the flow

32 / 50

32. *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

33 / 50

33. 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

34 / 50

34. Poise is the unit of

a) mass density

b) kinematic viscosity

c) viscosity

d) pressure gradient

35 / 50

35. In a flowing liquid, a particle may possess

a) potential energy

b) kinetic energy

c) pressure energy

d) all of the above

36 / 50

36. If S is the height of the crest above the base of the channel and H is the head of water over the weir, whose length is L and discharge is Q m^3/sec, the velocity of approach V_a is

a) √2gh

b) Q/L(H-L)

c) Q/L(H+L)

d) L(H+S)/Q

37 / 50

37. 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

38 / 50

38. 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

39 / 50

39. 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

40 / 50

40. *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

41 / 50

41. *Capillary rise is proportional to

a) surface tension

b) unit weight of water

c) diameter of the pipe

d) none of the above

42 / 50

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

a) crest

b) notch

c) top level

d) none of the above

43 / 50

43. *The hydraulic ram is a device

a) for lifting water without an electric motor

b) for accelerating water flow

c) for lifting heavy loads

d) none of the above

44 / 50

44. 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

45 / 50

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

a) horizontal

b) curved upwards

c) curved downwards

d) none of the above

46 / 50

46. *A stepped notch is a combination of

a) rectangular notches of different sizes

b) triangular notches of different sizes

c) rectangular and triangular notches

d) all of the above

47 / 50

47. The viscosity of liquids varies with temperature

a) directly proportional

b) inversely proportional

c) constant

d) none of the above

48 / 50

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

a) energy

b) all of the above

c) mass

d) momentum

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. *The discharge through a trapezoidal channel is maximum when

a) m = d

b) m = 2d

c) m = 3d

d) m = d/2

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