chemical engineering fluid mechanics for chemical chemical engineering MCQs – Page 13

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 Review each marked answer and report any item that may be outdated or unclear.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
241. Mass velocity is independent of temperature & pressure, when the flow is______________________?
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A. Steady and the cross-section is unchanged

B. Unsteady and the cross-section is changed

C. Steady through changing cross-section

D. Unsteady through unchanged cross-section

242. The velocity profile exhibited by laminar flow of Newtonian fluids is such that the velocity distribution w.r.t. radius of the circular pipe is a/an ______________ with the apex at the centre line of the pipe?
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A. Hyperbola

B. Semi-circle

C. Semi-ellipse

D. Parabola
243. Prandtl number is a measure of the__________________?
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A. Inertial force to elastic force in the fluid flow

B. Cp/Cv of a fluid

C. Elastic force to pressure force in the fluid flow

D. Heat conduction to viscosity of a fluid
244. Design of the casing of centrifugal pump should be such as to minimise the________________?
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A. Back flow through impeller

B. None of these

C. Loss of kinetic head

D. Loss of static head

245. Ratio of inertial forces to surface tension forces is called the _____________ number?
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A. Weber

B. Euler

C. Froude

D. Mach

246. In case of Couette flow, the fluid flow is between two large flat parallel plates with___________________?
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A. Top plate moving and the bottom plate fixed

B. Bottom plate moving and the top plate fixed

C. Both the plates fixed

D. Both the plates moving

247. For a given Reynolds number, in a hydraulically smooth pipe, further smoothening ____________ the friction factor?
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A. Brings about no further reduction of

B. Decreases

C. Increases

D. None of these

248. The energy loss in flow through Venturimeter is less than that through flow nozzle, because in case of a flow nozzle, the ?
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A. Distance between the throat and the inlet is more

B. Sudden expansion of flow in the downstream occurs

C. Length is shorter

D. Throat diameter is more

249. Hydraulic mean radius for flow through packed bed of spherical particle of size, Dp, with porosity ? is________________?
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A. (Dp/6) (?/1- ?)

B. ?Dp (?/1- ?)

C. (Dp/6) (1- ?/?)

D. ?Dp (1- ?/?)

250. Boundary layer exists in flow_________________?
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A. Of real fluids

B. Over flat surfaces only

C. Of ideal fluids only

D. In pipes only

251. At high Reynolds number_________________?
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A. Inertial forces control and viscous forces are unimportant

B. Viscous forces predominate

C. Inertial forces are unimportant and viscous forces control

D. None of these

252. One dimensional flow implies________________________?
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A. A flow which does not account for changes in transverse direction

B. Unsteady uniform flow

C. Steady uniform flow

D. Flow in a straight line

253. Steady non-uniform flow is exemplified by flow through a/an___________________?
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A. Expanding tube at increasing rate

B. Expanding tube at constant rate

C. Long pipe at constant rate

D. Long pipe at decreasing rate

254. Froude number is the ratio of__________________?
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A. Inertial stress to gravitational stress

B. Inertial stress to shear stress

C. Shear stress to gravitational stress

D. Drag stress to shear stress

255. Isothermal turbulent flow of a fluid results in decrease of its pressure, which depends on the______________?
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A. Wall roughness

B. Reynolds number

C. Both A. & B.

D. Neither A. nor B.

256. A Venturimeter measures the___________________?
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A. Point velocity

B. Velocity head

C. Pressure

D. None of these
257. Slugging occurs in a fluidised bed, if the bed is___________________?
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A. Narrow

B. Deep

C. Both A. & B.

D. Neither A. nor B.

258. Pressure drag does not depend upon the_________________?
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A. Pressure of main flow only

B. All A., B. and C.

C. Length of the body in flow direction

D. Roughness of surface of the body

259. While starting an axial flow pump, its delivery valve should be kept _______________?
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A. Closed

B. Open

C. Either open or closed

D. None of these

260. Kinetic energy of fluid per unit weight represented by the velocity head is given by___________________?
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A. v2/2gc

B. ?.v2/2gc

C. 2v2/gc

D. ?v2/gc