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. *The magnitude of capillary rise is more in:

a) silts

b) sands

c) clays

d) gravels

2 / 50

2. *In flow, the liquid particles may possess

a) potential energy

b) kinetic energy

c) pressure energy

d) all of the above

3 / 50

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

a) unsteady

b) non-uniform

c) turbulent

d) incompressible

4 / 50

4. *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

5 / 50

5. *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

6 / 50

6. *Cavitations is caused by

a) low pressure

b) high pressure

c) low velocity

d) high velocity

7 / 50

7. For the laminar flow through a circular pipe, the maximum velocity is

a) the maximum velocity=1.5 times the average velocity

b) the maximum velocity=2.0 times the average velocity

c) the maximum velocity=2.5 times the average velocity

d) none of the above

8 / 50

8. *The continuity equation deals with the law of conservation of

a) mass

b) momentum

c) energy

d) force

9 / 50

9. *1 m head is equivalent to

a) 0.1 kg/cm^2

b) 0.2 kg/cm^2

c) 0.3 kg/cm^2

d) 0.4 kg/cm^2

10 / 50

10. If the fluid particles move in straight lines and all the lines are parallel to the surface, the flow is called

a) steady

b) uniform

c) compressible

d) laminar

11 / 50

11. *If the velocity, pressure, density, etc., do not change at a point with respect to time, the flow is called

a) uniform

b) incompressible

c) non-uniform

d) steady

12 / 50

12. *Orifice-meter is used to measure:

a) pressure at the point

b) discharge

c) average speed

d) velocity

13 / 50

13. If the Froude number in open channel flow is less than 1.0, the flow is called

a) critical flow

b) super-critical flow

c) sub-critical flow

d) none of the above

14 / 50

14. 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

15 / 50

15. The most economical section of a circular channel for the maximum discharge is when

a) depth of water = 0.95 diameter of the circular section

b) hydraulic mean depth = 0.286 diameter of the circular section

c) wetted perimeter = 2.6 diameters of the circular section

d) all 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 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

18 / 50

18. Hydraulic gradient line and total energy line are

a) same

b) different

c) differ by pressure head

d) differ by static head

19 / 50

19. *The rate of flow through a venturimeter varies as

a) H^1/2

b) H^3/2

c) H^4/2

d) H^5/2

20 / 50

20. Liquids or fluids

a) have no shape

b) cannot be compressed

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

d) none of the above

21 / 50

21. *If the velocity in a fluid flow does not change with respect to the length of the direction of flow, it is called

a) steady flow

b) uniform flow

c) incompressible flow

d) rotational flow

22 / 50

22. *Hydraulic gradient line (H.G.L.) represents the sum of

a) pressure head and kinetic head

b) kinetic head and datum head

c) pressure head, kinetic head, and datum head

d) pressure head and datum head

23 / 50

23. *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

24 / 50

24. *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

25 / 50

25. *If fluid or flow parameters at any given instant remain the same at every point in space, it is called:

a) steady flow

b) laminar flow

c) uniform flow

d) rotational flow

26 / 50

26. 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

27 / 50

27. *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

28 / 50

28. *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

29 / 50

29. *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

30 / 50

30. 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

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. 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

33 / 50

33. 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

34 / 50

34. 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

35 / 50

35. 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

36 / 50

36. One horsepower is equal to

a) 1 kW

b) 0.746 kW

c) 0.836 kW

d) 0.756 kW

37 / 50

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

a) maximum

b) zero

c) unpredictable

d) none of the above

38 / 50

38. A rise or fall of liquid in a glass tube of a very small diameter when dipped is

a) directly proportional to the force per unit length of periphery

b) directly proportional to the sine of the angle of contact

c) directly proportional to the specific weight of the liquid

d) inversely proportional to the diameter of the glass tube

39 / 50

39. 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

40 / 50

40. *The imaginary line joining each head of water is called

a) hydraulic gradient line

b) residual line

c) loss of gradient line

d) none of the above

41 / 50

41. 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)

42 / 50

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

a) submerged weir

b) Cipolletti weir

c) triangular weir

d) sharp-crested weir

43 / 50

43. 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

44 / 50

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

a) vein

b) nappe

c) sill

d) none of the above

45 / 50

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

a) fluid

b) liquid

c) solid

d) gas

46 / 50

46. Water belongs to

a) compressible fluids

b) none of the above

c) Newtonian fluids

d) non-Newtonian fluids

47 / 50

47. 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

48 / 50

48. 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

49 / 50

49. Hydraulic gradient line for an open flow channel is

a) below water level

b) same as water level

c) above water level

d) all of the above

50 / 50

50. *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

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