fluid mechanics MCQs – Page 3

Practise focused fluid mechanics questions with marked answers for exam preparation and subject revision.

fluid mechanics Mcqs

41. A closed tank containing water is moving in a horizontal direction along a straight line at a constant speed. The tank also contains a steel ball and a bubble of air. If the tank is decelerated horizontally, then________________?
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A. the bubble will move to the front

B. the bubble will move to the rear </strong>

C. the ball will move to the front

D. d out which of the above statements are correct ?

E. the ball will move to the rear

42. The eddy viscosity for turbulent flow is______________?
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A. dependent on the flow

B. a function of temperature only

C. independent of the flow

D. a physical property of the fluid.

43. The depth d below the free surface at which the point velocity is equal to the average velocity of flow for a uniform laminar flow with a free surface, will be_________________?
0

A. 0.223 D

B. 0.707 D

C. 0.423 D

D. 0.577 D

44. In a forced vortex motion, the velocity of flow is________________?
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A. directly proportional to the square of its radial distance from the axis of rotation

B. inversely proportional to its radial distance from the axis of rotation

C. inversely proportional to the square of its radial distance from the axis of rotation

D. directly proportional to its radial distance from axis of rotation

45. In steady flow of a fluid, the total accele ration of any fluid particle______________?
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A. is independent of coordinates

B. is never zero

C. can be zero

D. is always zero

46. An open tank contains 1 m deep water with 50 cm depth of oil of specific gravity 0.8 above it. The intensity of pressure at the bottom of tank will be________________?
0

A. 10 kN/m2

B. 12 kN/m2

C. 4 kN/m2

D. 14 kN/m2

47. The pitot tube is used to measure________________?
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A. stagnation pressure

B. velocity at stagnation point

C. dynamic pressure

D. static pressure

48. The boundary layer thickness in turbulent flow varies as______________?
0

A. x,/2

B. x7

C. x4/5

D. x3/5

49. If the elevation of hydraulic grade line at the junction of three pipes is above the elevation of reservoirs B and C and below reservoir A, then the direction of flow will be___________________?
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A. from reservoir A to reservoirs B and C

B. from reservoir C to reservoirs A and B

C. from reservoir B to reservoirs C and A

D. unpredictable

50. An open cubical tank of 2 m side is filled with water. If the tank is rotated with an acceleration such that half of the water spills out, then the acceleration is equal to_______________?
0

A. g

B. g/3

C. g/2

D. 2g/3

51. A valve is suddenly closed in a water main in wl.ich the velocity is 1 m/sec and velocity of pressure wave is 981 m/ sec. The inertia head at the valve will be________________?
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A. 1 m

B. none of the above

C. 10m

D. 100m

52. A right circular cylinder open at the top is filled with liquid and rotated about its vertical axis at such a speed that half the liquid spills out, then the pressure intensity at the center of bottom is___________________?
0

A. one-half its value when cylinder was full

B. cannot be predicted from the given data

C. one-fourth its value when cylinder was full

D. zero

53. The shear stress distribution for a fluid flowing in between the parallel plates, both at rest, is_______________?
0

A. constant over the cross section

B. parabolic distribution across the section

C. zero at plates and increases linearly to midpoint

D. zero at the mid plane and varies linearly with distance from mid plane

54. If x is the distance from leading edge, then the boundary layer thickness in laminar flow varies as________________?
0

A. x/7

B. x

C. x

D. x

55. Size of a venturimeter is specified by________________?
0

A. pipe diameter

B. throat diameter

C. angle of diverging section

D. both pipe diameter as well as throat diameter

56. Select the correct statement?
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A. The friction factor decreases with time

B. The absolute roughness of a pipe de-creases with time

C. A pipe becomes smooth after using for long time

D. The absolute roughness increases with time

57. The increase in meta centric height_________________?
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A. increases comfort for passengers

B. decreases comfort for passengers</strong>

C. correct answer is?

D. decreases stability

E. increases stability

58. For hydro-dynamically smooth boundary, the friction coefficient for turbulent flow is_______________?
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A. a function of Reynolds number and relative roughness

B. constant

C. dependent on relative roughness only

D. dependent only on Reynolds number

59. Drag force is a function of________________?
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A. velocity of the body

B. projected area of the body

C. correct answer is ?

D. mass density of the fluid

60. The theoretical value of coefficient of contraction of a sharp edged orifice is_______________?
0

A. 1

B. 0.85

C. 0.98

D. 0.611

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