chemical engineering fluid mechanics for chemical chemical engineering MCQs – Page 6

Practise multiple-choice questions from chemical engineering fluid mechanics for chemical chemical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering fluid mechanics for chemical chemical engineering Mcqs
101. The ratio of the depth of flow to the diameter of the channel for maximum discharge in a circular channel in open channel flow is________________?
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A. 1.85

B. 0.1

C. 0.55

D. 0.95
102. Drag co-efficient for flow past immersed body is the ratio of _____________ to the product of velocity head and density?
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A. Average drag per unit projected area

B. None of these

C. Shear stress

D. Shear force

103. I.D. of 1/4? schedule 40 pipe is 0.364?. I.D. of a 1/2? schedule 40 pipe would be ______________ inch?
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A. 0.474

B. 4.728

C. 0.622

D. 0.5

104. In a free vortex, the_____________________?
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A. Flow is necessarily rotational

B. Velocity changes linearly with radial distance

C. Radial component of velocity is same everywhere

D. Stream lines are not circular

105. Which of the following is the most common pump for pumping either raw sewage or sludge ?
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A. Electromagnetic pump

B. Reciprocating pump

C. Gear pump

D. Centrifugal pump

106. Poise is converted into stoke by ___________________?
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A. Dividing by density (gm/c.c)

B. Multiplying with specific gravity

C. Dividing by specific gravity

D. Multiplying with density (gm/c.c)

107. The fluid velocity varies as the square root of the cylindrical pipe diameter in case of steady state laminar flow at constant pressure drop of _____________ fluid?
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A. Dilatent

B. Newtonian

C. Pseudo-plastic

D. Bingham plastic

108. Newtons law of viscosity relates the____________________?
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A. Pressure gradient and rate of angular deformation

B. Shear stress and velocity

C. Shear stress and rate of angular deformation in a fluid

D. Velocity gradient and pressure intensity

109. Toothpaste is a__________________?
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A. Dilatent

B. Pseudo-plastic

C. Newtonian liquid

D. Bingham plastic

110. Mach number is the ratio of the speed of the _____________________?
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A. Sound to that of the fluid

B. Light to that of the fluid

C. Fluid to that of the light

D. Fluid to that of the sound
111. In continuous fluidisation_________________?
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A. Velocity of the fluid is very small

B. Solids are completely entrained

C. There is no entrainment of solids

D. The pressure drop is less than that for batch fluidisation

112. Pressure drop (?p) for a fluid flowing in turbulent flow through a pipe is a function of velocity (V) as___________________?
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A. V2.7

B. V-0.2

C. V1.8

D. V2
113. The boundary layer thickness at a given section along a flat plate _____________ with increasing Reynolds number?
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A. Remain same

B. Increases

C. Decreases

D. May increase or decrease

114. A tube is specified by its____________________?
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A. Thickness & outer diameter both

B. Outer diameter only

C. Thickness only

D. Inner diameter

115. What is the ratio of displacement thickness to nominal thickness for a linear distribution of velocity in the boundary layer on a flat plate ?
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A. 1.5

B. 0.5

C. 1

D. 2

116. Fluid resistance to shear depends upon its_______________?
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A. Rate of transfer of molecular momentum

B. Cohesion

C. Both A. and B.

D. Neither A. nor B.

117. Transition length for a turbulent fluid entering into a pipe is around _____________ times the pipe diameter?
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A. 5

B. 50

C. 500

D. 5000

118. A piezometer provided in the pipe measures__________________?
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A. None of these

B. Static pressure

C. Friction factor

D. Dynamic pressure

119. A liquid is pumped at the rate of 600 litres using 1000 rpm. If the rpm is changed to 1100, the liquid pumped is _____________ litres?
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A. 660

B. 1.1

C. 60

D. 600

120. Bernoullis equation is not applicable, when the flow is___________________?
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A. Viscous

B. All A., B. & C.

C. Irrotational

D. Incompressible