chemical engineering fluid mechanics for chemical chemical engineering MCQs – Page 7

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 Review each marked answer and report any item that may be outdated or unclear.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
121. Viscosity of water at 40C lies in the range of___________________?
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A. 1 10-3 to 2 10-3 kg/m.s

B. 0.5 to 1 kg/m.s

C. 0.5 10-3 to 1 10-3 kg/m.s

D. 1 to 2 kg/m.s

122. In deriving Bernoullis equation, fluid is assumed to be________________?
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A. Uniform, steady, incompressible, along a streamline

B. Steady, density being pressure dependent, frictionless

C. Incompressible, frictionless, steady, along a streamline

D. None of these

123. In a fluidised bed reactor___________________?
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A. Temperature gradients are very high

B. Segregation of the solids occurs

C. Hot spots are formed

D. Temperature is more or less uniform
124. Scale up of agitator design requires________________?
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A. Geometrical similarity only

B. Dynamic similarity only

C. Both geometrical and dynamic similarity

D. All geometrical, dynamic and kinematic similarity
125. The percentage slip in a reciprocating pump set is given by the % of (where, Q1 = actual discharge Q2 = theoretical discharge) ?
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A. (Q2 Q1)/Q1

B. Q2/Q1

C. (Q2 Q1)/Q2

D. Q1/Q2

126. In case of unsteady fluid flow, conditions & flow pattern change with the passage of time at a position in a flow situation. Which of the following is an example of unsteady flow ?
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A. Discharge of water by a centrifugal pump being run at a constant rpm

B. Water discharge from a vertical vessel in which constant level is maintained

C. Low velocity flow of a highly viscous liquid through a hydraulically smooth pipe

D. Water flow in the suction and discharge pipe of a reciprocating pump
127. For turbulent flow of an incompressible fluid through a pipe, the flow rate Q? is proportional to (? P)n, where ?P is the pressure drop. The value of exponent n is_________________?
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A. 0

B. < 1

C. 1

D. > 1

128. In Newtons law range, the drag co-efficient for the motion of spherical particle in a stationary fluid is___________________?
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A. 0.44

B. 4.4

C. 44

D. 0.044

129. In the complete turbulence zone (in rough pipes), the____________________?
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A. Rough and smooth pipes have the same friction factor

B. Laminar film covers the roughness projections

C. Friction factor is independent of the relative roughness

D. Friction factor depends upon NRe only

130. Potential flow is characterised by the___________________?
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A. Formation of eddies within the stream

B. One in which dissipation of mechanical energy into heat occurs

C. Irrotational and frictionless flow

D. Irrotational and frictional flow

131. Low specific speed of a pump implies that, it is a/an ______________ pump?
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A. Axial flow

B. Centrifugal

C. None of these

D. Mixed flow

132. A pressure of 10 m head of water is equivalent to ______________ kN/m2?
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A. 98

B. 147

C. 196

D. 49

133. The ratio of maximum to average velocity in case of streamline flow between parallel plates is______________________?
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A. 2.5

B. 1.5

C. 1

D. 2

134. A relief valve__________________?
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A. Unloads a pump

B. None of these

C. Provides back pressure for a cylinder

D. Is a directional control valve
135. In case of end to end connection of two or more pipes in series, the ______________ each pipe?
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A. Rate of flow in each pipe is proportional to the length of

B. Head loss is same through

C. Total flow rate is the sum of flow rate in

D. Same rate of flow passes through
136. Stokes equation is valid in the Reynolds number range__________________?
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A. 2 to 10

B. 0.1 to 2

C. 0.01 to 0.1

D. 10 to 100

137. Fluid flow through a packed bed is represented by the ______________ equation?
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A. Hagen-Poiseuilles

B. Fannings

C. None of these

D. Erguns
138. For laminar flow of a fluid through a packed bed of spheres of diameter d, the pressure drop per unit length of bed depends upon the sphere diameter as_________________?
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A. d2

B. d? 2

C. d4

D. d

139. Critical velocity in a pipe flow_________________?
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A. Increases as pipe diameter increases

B. Independent of fluid density

C. None of these

D. Increases as fluid viscosity increases

140. The vent valve provided in a liquid handling centrifugal pump is___________________?
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A. Generally a needle valve

B. Helpful in easy removal of samples

C. Used to release any gases that might be vapour locking the pump

D. All A., B. and C.