chemical engineering fluid mechanics for chemical chemical engineering MCQs – Page 11

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 Review each marked answer and report any item that may be outdated or unclear.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

201. ______________ is an example of axial flow impeller?
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A. Propeller

B. Turbine

C. Paddle

D. All A., B. and C.

202. Cavitation occurs in a centrifugal pump when the suction pressure is________________?
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A. Greater than the vapour pressure of the liquid at that temperature

B. Equal to the vapour pressure

C. Less than the vapour pressure of the liquid at that temperature

D. Equal to the developed head

203. A 2? gate valve fitted in a pipe is replaced by a similar globe valve. Pressure drop in gate valve was ?p. For the same discharge, the pressure drop across globe valve is__________________?
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A. > ?p

B. < ?p

C. ?p

D. ?p2

204. Pumping of a corrosive liquid is generally preferred to be done by a ______________ pump, as it can be made of a variety of materials including plastics?
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A. Positive displacement

B. Gear

C. Sump

D. Piston

205. The curve of metacentre for a floating body ____________ the curve of buoyancy?
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A. Is always below

B. Is the evolute of

C. Is tangential to

D. Intersects at right angle

206. In case of turbulent flow of a Newtonian fluid in a straight pipe, the maximum velocity is equal to (where, Vavg = average fluid velocity)?
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A. 1.8 Vavg

B. 1.2 Vavg

C. Vavg

D. 1.5 Vavg

207. Ratio of pressure and inertia force gives ______________ number?
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A. Mach

B. Froude

C. Euler

D. Weber

208. An ideal plastic substance indicates no deformation, when stressed upto yield stress, but behaves like a Newtonian fluid beyond yield stress. Which of the following is an ideal plastic ?
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A. Sugar solution

B. Blood

C. Sewage sludge

D. Rubber latex

209. The contraction co-efficient for Bordas mouthpiece (for frictionless fluid) is__________________?
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A. 0.5

B. 0.1

C. 0.94

D. 1

210. The range of a particular Rotameter can be increased by__________________?
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A. Decreasing the diameter of the float

B. No means

C. Use of floats of different densities

D. Increasing the diameter of the float

211. Differential manometer measures the___________________?
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A. Pressure difference

B. Gauge pressure

C. Pressure gradient

D. Absolute pressure

212. For turbulent fluid flow in pipe, the expression for Prandtl one seventh power law is (where, r = pipe radius, x = distance) ?
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A. None of these

B. V/Vmax = (r/x)1/7

C. V/Vmax = (x/r)1/7

D. V/Vmax = (x.r)1/7

213. The value of critical Reynolds number for pipe flow is_________________?
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A. None of these

B. 10,000

C. 1,300

D. 100,000

214. Nominal size of a pipe is an indication of its ______________ diameter?
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A. None of these

B. Outer

C. Inner

D. Approximate

215. For very low pressure and high discharge rate, the compressor used is a/an ______________ compressor?
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A. None of these

B. Reciprocating

C. Axial

D. Rotary

216. The ratio of actual discharge to theoretical discharge through an orifice is equal to______________?
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A. Cv . Cd

B. Cd/Cv

C. Cc . Cd

D. Cc . Cv

217. Curve III in the bellow diagram represents a/an________________?
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A. Dilatent fluid

B. None of these

C. Pseudo plastic fluid

D. Ideal plastic

218. Check valve provided in the discharge line of a centrifugal pump serves the purpose of controlling the_______________?
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A. Back flow of fluid in the event of stoppage of pump

B. Flow of liquid during operation of the pump

C. Discharge pressure

D. All A., B. and C.

219. Check valve is used for ________________ flow?
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A. None of these

B. Unidirectional

C. Very precise control of

D. Multidirectional

220. The losses in open channel flow generally vary as the ________________?
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A. Inverse of the roughness

B. Inverse square of hydraulic radius

C. Square of the velocity

D. First power of the roughness

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