Hydraulics Online Test - Paper 3

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Vikash chaudhary

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Total Questions: 50
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1 / 50

1. *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

2 / 50

2. *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

3 / 50

3. 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

4 / 50

4. Hooke's law for solids is analogous to

a) Newton's law of viscosity

b) Pascal's law

c) Boundary layer theory

d) continuity equation

5 / 50

5. *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

6 / 50

6. *Pressure head is given by

a) P/w

b) z

c) v/2g

d) all

7 / 50

7. *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

8 / 50

8. Mass density of liquid (p) is given by

a) p = mass/volume

b) p = metric slug/m^2

c) p = kgsec^3/m^4

d) all of the above

9 / 50

9. 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

10 / 50

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

a) horizontal

b) curved upwards

c) curved downwards

d) none of the above

11 / 50

11. Discharge over an ogee weir remains the same as that of

a) sharp-crested weir

b) triangular weir

c) Cipolleti weir

d) drowned weir

12 / 50

12. *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

13 / 50

13. 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)

14 / 50

14. The term z is known as

a) potential energy

b) pressure energy

c) potential energy per unit weight

d) none of the above

15 / 50

15. *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

16 / 50

16. 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

17 / 50

17. *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

18 / 50

18. Cavitations is collapsed by

a) low pressure

b) high pressure

c) low velocity

d) high velocity

19 / 50

19. *Molecules of fluids get attracted due to

a) capillary action

b) surface tension

c) adhesion

d) cohesion

20 / 50

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

a) plasticity

b) viscosity

c) compressibility

d) none of the above

21 / 50

21. *The phenomenon occurring in an open channel when a rapidly flowing stream abruptly changes to a slowly flowing stream, causing a distinct rise of the liquid surface, is

a) water hammer

b) hydraulic jump

c) critical discharge

d) all of the above

22 / 50

22. 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

23 / 50

23. The difference in pressure head measured by a mercury-oil differential manometer for a 20 cm difference of mercury level will be (specific gravity of oil-0.8)

a) 2.72m of oil

b) 2.52m of oil

c) 3.20m of oil

d) 0.2m of oil

24 / 50

24. Liquids or fluids

a) have no shape

b) cannot be compressed

c) both (a) and (b) of above

d) none of the above

25 / 50

25. 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

26 / 50

26. 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

27 / 50

27. A ideal fluid

a) is frictionless and incompressible

b) obey Newton's law of viscosity

c) is similar to gas

d) is very viscous

28 / 50

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

a) vein

b) nappe

c) sill

d) none of the above

29 / 50

29. 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

30 / 50

30. Which of the following quantities are dimensionless?

a) surface tension

b) specific weight

c) angular velocity

d) Mach number

31 / 50

31. *An independent mass of a fluid does not possess

a) elevation energy

b) kinetic energy

c) pressure energy

d) none of the above

32 / 50

32. *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

33 / 50

33. *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

34 / 50

34. An intensifier is used to increase

a) pressure

b) temperature

c) energy

d) none of the above

35 / 50

35. *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

36 / 50

36. *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

37 / 50

37. 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

38 / 50

38. *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

39 / 50

39. *Manometers 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

40 / 50

40. *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

41 / 50

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

a) up

b) down

c) uplist

d) downlift

42 / 50

42. *The types of instrument used to measure low pressure with accuracy is

a) piezometer

b) barometer

c) micro manometer

d) mechanical gauge

43 / 50

43. *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

44 / 50

44. Poise is the unit of

a) mass density

b) kinematic viscosity

c) viscosity

d) pressure gradient

45 / 50

45. 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

46 / 50

46. The imaginary line drawn such that the tangents at its all points indicate the direction of the velocity of the fluid particle at each point is called

a) path line

b) stream line

c) potential line

d) streak line

47 / 50

47. 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

48 / 50

48. The attraction among different particles of the same material is

a) adhesion

b) cohesion

c) corrosion

d) fusion

49 / 50

49. 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

50 / 50

50. *The pressure in pipe flow is normally

a) less than atmospheric pressure

b) equal to atmospheric pressure

c) more than atmospheric pressure

d) none of the above

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