chemical engineering fluid mechanics for chemical chemical engineering MCQs – Page 22

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 Review each marked answer and report any item that may be outdated or unclear.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
421. For an unstable equilibrium of a floating body (where, M = metacentre.) ?
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A. M is below G

B. None of these

C. M is above G

D. M & G coincide

422. Which of the following pipe bends will incur the largest head loss ?
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A. U-bend

B. 45 bend

C. 90 bend

D. 30 bend

423. Two liquids manometer is used for measuring small pressure differences in___________________?
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A. None of these

B. Gases

C. Liquids

D. Mixture of hydrocarbons

424. ____________ is used for measuring the static pressure exerted on the wall by a fluid flowing parallel to the wall in a pipeline?
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A. Orificemeter

B. Pitot tube

C. Pressure gauge

D. Venturimeter

425. With increase in the ratio of orifice diameter to pipe diameter, the fraction of the orifice pressure differential that is permanently lost________________?
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A. Increases exponentially

B. Remains unchanged

C. Increases

D. Decreases
426. Centrifugal pump is normally classified on the basis of the________________?
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A. Type of casing

B. rpm

C. Impeller blade angle

D. Number of blades in impeller

427. Re/NFr is called the _____________ number?
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A. Brinkman

B. Archimedes

C. Galileo

D. Euler

428. Small pressure differences in liquids is measured using a/an__________________?
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A. None of these

B. Pitot tube

C. Inclined tube manometer

D. U-tube manometer

429. Experimental study of laminar fluid flow through a circular tube was conducted by____________________?
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A. Reynolds

B. Pascal

C. Hagen and Poiseuille

D. Blake-Plummer

430. A Rotameter through which air at room temperature and atmospheric pressure is flowing gives a certain reading for a flow rate of 100 cc/sec. If helium (molecular weight 4) is used and Rotameter shows the same reading, the flow rate (cc/sec) is__________________?
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A. 325

B. 26

C. 42

D. 269
431. Acceleration head in a reciprocating pump_______________________?
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A. Does not change the work requirement of the pump

B. Increases the work done during suction stroke

C. Decreases the work done during suction stroke

D. Increases the work done during delivery stroke

432. Reynolds number is the ratio of____________________?
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A. Inertial forces to gravity forces

B. Inertial forces to viscous forces

C. Viscous forces to inertial forces

D. Viscous forces to gravity forces

433. What causes cavitation in centrifugal pump ?
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A. Low suction pressure

B. High suction velocity

C. High suction pressure

D. Low barometric pressure

434. Hydrometer measures the specific gravity of liquids based on the principles of buoyancy. Pycnometer is used to measure the specific gravity of_________________?
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A. Powder & granular solids

B. Low melting point semi-solids

C. Liquids

D. All A, B & C
435. Check in a centrifugal pump is________________?
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A. Provided to prevent liquid from backing up through the pump when the pump is turned off or

B. All A., B. and C.

C. Provided in the discharge line

D. Generally a globe valve

E. idently stops running

436. The continuity equation in ideal fluid flow states that__________________?
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A. Net rate of inflow into any small volume must be zero

B. There exists a velocity potential

C. Energy is constant along a streamline

D. Energy is not constant along a streamline

437. A double acting reciprocating pump compared to a single acting pump (of almost same size working under same pressure levels) would give almost double___________________?
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A. None of these

B. Head

C. Efficiency

D. Discharge
438. When a fluid flows over a solid surface, the___________________?
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A. Velocity gradient is zero at the solid surface

B. Velocity is uniform at any cross-section

C. Velocity is not zero at the solid surface

D. ers themselves

E. Resistance between the surface & the fluid is lesser as compared to that between the fluid

439. The dimension of dynamic viscosity is__________________?
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A. ML-1T-2

B. ML-1T-1

C. LT-2

D. L2T-1

440. Volume of liquid displaced by a floating body is equivalent to its_________________?
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A. Own weight

B. Submerged weight

C. Submerged volume

D. Own volume