chemical engineering fluid mechanics for chemical chemical engineering MCQs – Page 25

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 Review each marked answer and report any item that may be outdated or unclear.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
481. For turbulent flow in smooth circular pipe, the velocity distribution is a function of the distance d measured from the wall of the pipe and the friction velocity v, and it follows a _____________ relationship?
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A. Hyperbolic

B. Linear

C. Logarithmic

D. Parabolic

482. In the Newtons law range, the terminal velocity of a solid spherical particle falling through a stationary fluid mass is ______________ the fluid viscosity?
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A. Inversely proportional to

B. Independent of

C. Inversely proportional to the square root of

D. Directly proportional to

483. The equation f-0.5 = 4.07 loge (NRe ?f)-0.6 is called the ____________?
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A. None of these

B. Von-Karman equation

C. Colebrook formula

D. Fanning equation

484. In case of a ____________ the energy of flow is considerably decreased downstream of the machine?
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A. Turbine

B. Blower

C. Centrifugal pump

D. Centrifugal fan

485. The Stokes stream function applies to the________________?
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A. Irrotational flow only

B. None of these

C. Cases of axial symmetry

D. Ideal/non i viscous fluids only

486. Air vessel provided in a reciprocating pump__________________?
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A. Increases the volumetric efficiency of the pump

B. Smoothens the flow by avoiding pulsations

C. Saves the pump from the danger of cavitation

D. None of these
487. The Navier-Stokes equation deals with the law of conservation of___________________?
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A. Mass

B. Energy

C. Both A. & B.

D. Momentum
488. Major loss in sudden contraction in pipe flow is due to ________________?
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A. Expansion of flow after sudden contraction

B. None of these

C. Flow contraction

D. Boundary friction

489. What is the pipe called which lifts water from a reservoir to a greater height than the initial level in the supply reservoir ?
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A. Pressure pipeline

B. Tunnel

C. Penstock

D. Siphon
490. Deformation drag, which is caused by widespread deformation of fluid around the immersed body____________________?
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A. Depends mainly on cross-sectional shape

B. Occurs when NRe is very small

C. Is primarily a friction drag

D. Is independent of body length

491. Cd is always ______________ Cc?
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A. Less than

B. Greater than

C. Equal to

D. Either more or less than

492. Cavitation in a pump creates so many undesirable effects. Out of the following, which is not an undesirable effect created by cavitation ?
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A. Develops noise

B. Develops high pressure

C. Increase in thrust

D. Decrease in effect

493. What causes convective acceleration in fluid flow ?
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A. Turbulence in flow

B. Non-uniformity of flow

C. Steep slope in flow

D. Unsteady nature of flow

494. A centrifugal pump loses prime after starting. The reason of this trouble may be_____________________?
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A. Incomplete priming

B. All A., B., and C.

C. Low available NPSH and air leaks in the suction pipe

D. Too high a suction lift

495. Venturimeters, orificemeters and nozzles are used to measure the fluid discharge from a pipeline. The average fluid velocity in a pipeline can be measured by a/an________________?
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A. Weir

B. Cup and vane anemometer

C. None of these

D. Hot wire anemometer
496. All pipes of a particular nominal size have the same_________________?
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A. None of these

B. Inside diameter

C. Outside diameter

D. Thickness

497. Dimension of absolute viscosity is_________________?
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A. MLT

B. ML-1T

C. ML-1T-1

D. MLT-1

498. Vena-contracta formed during flow of a liquid through an orificemeter has__________________?
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A. Minimum velocity of fluid stream

B. Minimum liquid cross-section

C. None of these

D. More diameter compared to orifice diameter

499. In case of supersonic flow of a fluid through pipeline, the Mach number is__________________?
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A. > 1

B. < 1

C. 1

D. 0

500. A pitched-blade turbine draws ______________ a straight blade turbine?
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A. Data insufficient to predict

B. Less power than

C. More power than

D. Same power as