fluid mechanics mechanical engineering MCQs – Page 4

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

fluid mechanics mechanical engineering Mcqs

61. In a static fluid ___________________?
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A. fluid pressure is zero

B. viscosity is nil

C. linear deformation is small

D. resistance to shear stress is small

E. only normal stresses can exist

62. The flow in which each liquid particle has a definite path and their paths do not cross each other is called__________________?
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A. steady flow

B. uniform flow

C. turbulent flow

D. streamline flow

E. one dimensional flow

63. In an immersed body, centre of pressure is __________________?
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A. could be above or below e.g. depending on density of body and liquid

B. at the centre of gravity

C. unpredictable

D. below be centre of gravity

E. above the centre of gravity

64. The equation of continuity holds good when the flow____________________?
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A. is one dimensional

B. velocity is uniform at all the cross sections

C. none of the above

D. is steady

E. all of the above

65. For pipes, turbulent flow occurs when Reynolds number is _____________________?
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A. more than 4000

B. less than 2000

C. between 2000 and 4000

D. less than 4000

E. none of the above

66. Which of the following is the unit of kinematic viscosity _________________?
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A. pascal

B. poise

C. none of the above

D. stoke

E. faraday

67. Two dimensional flow occurs when________________?
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A. the direction and magnitude of the velocity at all points are identical

B. the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plane

C. the velocity of successive fluid particles, at any point, is the same at successive periods of time

D. velocity, depth, pressure, etc. change from point to point in the fluid flow

E. the magnitude and direction of the velocity do not change from point to point in the fluid

68. The value of mass density in kgsecVm4 for water at 0C is_________________?
0

A. 101.9

B. 1

C. 100

D. 91

E. 1000

69. For pipes, laminar flow occurs when Roynolds number is__________________?
0

A. between 2000 and 4000

B. less than 4000

C. less than 2000

D. none of the above

E. more than 4000

70. Buoyant force is___________________?
0

A. equal to the volume of liquid displaced

B. the resultant force on a body due to the fluid surrounding it

C. force necessary to keep a body in equilibrium

D. none of the above

E. resultant force acting on a floating body

71. Flow occurring in a pipeline when a valve is being opened is________________?
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A. laminar

B. unsteady

C. rotational

D. steady

E. vortex

72. Manometer is used to measure__________________?
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A. pressure in pipes, channels etc

B. difference of pressure between two points

C. very low pressure

D. atmospheric pressure

E. velocity

73. Center of buoyancy is the___________________?
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A. does not exist

B. center of pressure of displaced volume

C. centroid of the displaced volume of fluid

D. none of the above

E. e.g. of floating body

74. Specific weight of water in S.I. units is equal to ________________?
0

A. 1000 N/m3

B. 9.81 N/m3

C. 10000 N/m3

D. 9.81 xlO6N/m3

E. 9.81 xlO3 N/m3

75. Ratio of inertia force to elastic force is known as__________________?
0

A. none of the above

B. Webers number

C. Mach number

D. Reynolds number

E. Froude number

76. Dynamic viscosity of most of the liquids with rise in temperature__________________?
0

A. increases

B. remains unaffected

C. decreases

D. unpredictable

E. none of the above

77. Non uniform flow occurs when_________________?
0

A. the velocity of successive fluid particles, at any point, is the same at successive periods of time

B. velocity, depth, pressure, etc. change from point to point in the fluid flow

C. the direction and magnitude of the velocity at all points are identical

D. the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plane

E. the magnitude aricf direction of the velocity do not change from point to point in the fluid

78. Newtons law of viscosity is a relationship between____________________?
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A. shear stress, velocity and viscosity

B. pressure, velocity and viscosity

C. shear stress and viscosity

D. shear stress, pressure and rate of angular distortion

E. shear stress anctthejiate of angular distortion

79. The bulk modulus of elasticity with increase in pressure__________________?
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A. increases

B. increases first up to certain limit and then decreases

C. unpredictable

D. decreases

E. remains constant

80. According to Bernoullis equation for steady ideal fluid flow____________________?
0

A. total energy is constant throughout

B. velocity and pressure are inversely proportional

C. none of the above

D. the energy is constant along a stream-line but may vary across streamlines

E. principle of conservation of mass holds

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