fluid mechanics MCQs – Page 5

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

fluid mechanics Mcqs
81. Two pipe systems are said to be equivalent when_________________?
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A. friction factor and length are same in two systems

B. length of pipe and discharge are same in two systems

C. head loss and discharge are same in two systems

D. length and diameter are same in two systems

82. The continuity equation pi V,A,= p2V2A2 is based on the following assumption regarding flow of fluid______________?
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A. uniform flow

B. incompressible flow

C. steady flow

D. frictionless flow

83. Coefficient of discharge for a totally submerged orifice as compared to that for an orifice discharging free is__________________?
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A. nearly half

B. slightly less

C. slightly more

D. equal

84. If the velocity is zero over half of the cross-sectional area and is uniform over the remaining half, then the momentum correction factor is_______________?
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A. 2

B. 3-Apr

C. 4

D. 1

85. Least possible value of correction factor for________________?
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A. kinetic energy is 1

B. momentum is zero

C. kinetic energy is zero

D. momentum is 1</strong>

86. Metacentric height for small values of angle of heel is the distance between the________________?
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A. free surface and centre of buoyancy

B. centre of gravity and metacentre

C. centre of gravity and centre of buoy-ancy

D. centre of buoyancy and metacentre

87. Which of the following is used to measure the discharge ?
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A. current meter

B. venturimeter

C. hotwire anemometer

D. pitot tube

88. Stream lines and path lines always coincide in case of__________________?
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A. steady flow

B. uniform flow

C. laminar flow

D. turbulent flow

89. Which of the following velocity potentials satisfies continuity equation ?
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A. x2y

B. cosx

C. x2-y2

D. x2 + y2

90. The wake_______________?
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A. is a region of high pressure intensity

B. always occurs before a separation point

C. none of the above

D. always occurs after a separation point
91. A fluid of kinematic viscosity 0.4 cm2/sec flows through a 8 cm diameter pipe. The maximum velocity for laminar flow will be__________________?
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A. 2 m/sec

B. 1.5 m/sec

C. 1 m/sec

D. less than 1 m/sec

92. For laminar flow in a pipe of circular cross-section, the Darcys friction factor f is________________?
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A. directly proportional to Reynolds number and independent of pipe wall roughness

B. inversely proportional to Reynolds number and directly proportional to pipe wall roughness

C. directly proportional to pipe wall roughness and independent of Reynolds number

D. inversely proportional to Reynolds number and indpendent of pipe wall roughness
93. Coefficient of velocity for Bordas mouth piece running full is________________?
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A. 0.855

B. 1

C. 0.707

D. 0.611

94. The total pressure on a plane surface inclined at an angle 9 with the horizontal is equal to_______________?
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A. PA

B. pA cos 9

C. pA sin 9

D. pA tan 9

95. When time of closure tc = L/v0 (where L is length of pipe and v0 is speed of pressure wavE., the portion of pipe length subjected to maximum head is__________________?
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A. L/2

B. L/4

C. L

D. L/3

96. The discharge through a V- notch varies as______________?
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A. H5/2

B. H54 where H is head

C. H1/2

D. H32

97. The velocity distribution for laminar flow through a circular tube__________________?
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A. varies linearly from zero at walls to maximum at centre

B. is constant over the cross-section

C. varies parabolically with maximum at the centre

D. none of the above

98. Ay between two stream lines represents________________?
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A. discharge

B. velocity

C. pressure

D. head