chemical engineering fluid mechanics for chemical chemical engineering MCQs – Page 12

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 Review each marked answer and report any item that may be outdated or unclear.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
221. A centrifugal pump designed to pump water is employed to pump a more viscous oil. In the later case, the pump_________________?
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A. Develops a lower head

B. Requires more power

C. Capacity is reduced

D. All A., B. and C.
222. The discharge through a rectangular weir varies as ___________________?
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A. H2/5

B. H5/2

C. H1/2

D. H3/2
223. Hydraulic diameter for non-circular ducts is equal to ___________ times the area of flow divided by the perimeter?
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A. Eight

B. Four

C. Three

D. Two

224. In case of a centrifugal pump, the theoretical head developed is dependent on the _____________ the impeller?
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A. Speed of

B. All A., B. and C.

C. Diameter of

D. Fluid velocity leaving

225. Two piping system are said to be equivalent, when the ______________ are same?
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A. Length & friction factor

B. Length & diameter

C. Diameter & friction factor

D. Fluid flow rate & friction loss
226. In fluid flow, cavitation is caused, if the____________________?
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A. Fluid velocity decreases to zero

B. Total energy decreases

C. Both A. and B.

D. Flow pressure approaches its vapor pressure at the prevailing temperature
227. Water hammer in a pipeline results from the____________________?
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A. Pressure increase due to closure of a valve resulting in decrease in rate of flow

B. Bursting of pipelines due to closure by a valve

C. None of these

D. Rapid pressure change due to a rapid change in the rate of flow
228. The valve used for very remote and accurate control of fluid is a _____________ valve?
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A. Gate

B. Butterfly

C. Globe

D. Needle
229. Normal depth in open channel flow is the depth of flow in the channel ____________________?
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A. Measured normal to the channel bed

B. Corresponding to uniform flow

C. None of these

D. Corresponding to steady flow

230. A mixed flow centrifugal pump_______________________?
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A. Employs such an impeller, through which the flow is a combination of radial & axial flow

B. Mixes the two fluids before pumping them

C. Pumps the two fluids separately and then mixes them

D. Employs impellers in both the radial & axial directions

231. Drag co-efficient for motion of spherical particles in a stationary fluid in the stokes law range is_________________?
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A. 64/NRe,P

B. 48/NRe,P

C. 16/NRe,P

D. 24/NRe,P
232. The fluid in which the shearing stress within it is proportional to the velocity gradient across the sheared section, is called a _____________ fluid?
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A. Bingham

B. Newtonian

C. Perfect

D. None of these

233. A fluid is the one, which___________________?
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A. Permanently resists distortion

B. Is incompressible

C. Cannot remain at rest under the action of shear force

D. Continuously expands till it fills any container

234. Applying a pressure drop across a capillary results in a volumetric flow rate Q under laminar flow conditions. The flow rate for the same pressure drop, in a capillary of the same length but half the radius is____________________?
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A. Q/2

B. Q/16

C. Q/4

D. Q/8

235. Which of the following conditions must be satisfied for lift force to be developed ?
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A. Circulation around the body is essentially required

B. The body should be stream lined

C. The main stream velocity must approach the velocity of sound in that fluid medium

D. The body should be bluff body

236. Brownian movement is prominent in the particle size range of _____________ microns in case of settling of a particle in a fluid?
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A. 2 to 3

B. 0.01 to 0.10

C. 100 to 1000

D. 200 to 300

237. With increase in temperature, the vapor pressure of liquids__________________?
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A. Increases

B. Increases linearly

C. Remain constant

D. Decreases

238. For an incompressible fluid, the bulk modulus of elasticity is____________________?
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A. 0 N/m

B. 5 kg/m3

C. ? N/m2

D. 1 N

239. Mach number is defined as the ratio of the local flow velocity to the sonic velocity in the fluid. For what value of Mach number, the gases are considered incompressible ?
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A. > 3

B. 1

C. < 0.3

D. 50

240. Weber number is the ratio of inertial force to _____________ force?
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A. Viscous

B. Elastic

C. Gravity

D. Surface tension