chemical engineering MCQs – Page 318

Practise multiple-choice questions from chemical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering Mcqs
6341. Terminal velocity is_____________________?
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A. Attained after moving one-half of total distance

B. A fluctuating velocity

C. A constant velocity with no acceleration

D. None of these

6342. A mercury (specific gravity = 13.6) manometer connected across an orificemeter fitted in a pipe shows a manometer reading of 2 cms. If the manometer liquid is changed to carbon tetrachloride (specific gravity = 1.6), then for the same flow rate of water the new manometer reading will be _______________ cms?
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A. 42

B. 1.8

C. 17

D. 84

6343. Head developed by a centrifugal pump depends on its___________________?
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A. Speed

B. Impeller diameter

C. Both A. and B.

D. Neither A. nor B.

6344. Rubber latex is an example of ______________ fluid?
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A. Bingham plastic

B. Pseudo plastic

C. Dilatants

D. Newtonian

6345. Laminar flow is characterised by the nonexistence of_________________?
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A. Deviating velocities

B. Pressure fluctuation

C. Eddies

D. All A., B. & C.
6346. Hydraulic mean radius for flow through packed bed of spherical particle of size, Dp, with porosity ? is________________?
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A. ?Dp (?/1- ?)

B. ?Dp (1- ?/?)

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

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

6347. Steady uniform flow is represented by flow through a/an ___________________?
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A. Expanding tube at constant rate

B. None of these

C. Long pipe at decreasing rate

D. Long pipe at constant rate
6348. Differential manometer measures the___________________?
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A. Pressure gradient

B. Absolute pressure

C. Gauge pressure

D. Pressure difference
6349. In power law, ? = [A (du/dy)2 + B] then the fluid is__________________?
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A. Thixotropic

B. Dilatant

C. Newtonian

D. Rheopectic

6350. The distance between metacentre and ______________ is called metacentric height?
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A. Water surface

B. Centre of gravity

C. Centre of buoyancy

D. None of these

6351. Ratio of inertial forces to surface tension forces is called the _____________ number?
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A. Froude

B. Weber

C. Mach

D. Euler

6352. The capillary rise of mercury is maximum in glass tube of dia _____________ mm?
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A. 0.5

B. 5

C. 1

D. 2

6353. Vane anemometer __________________?
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A. ersed</strong>

B. None of these

C. Rotates an element at a speed determined by the velocity of the fluid in which the meter is

D. Is a variable head meter

E. Is an area meter

6354. A bed of spherical particles (specific gravity 2.5) of uniform size 1500 ?m is 0.5 m in diameter and 0.5 m high. In packed bed state, the porosity may be taken as 0.4. Erguns equation for the above fluid-particle system (in SI units) is given below: ? P/L = 375 103 VOM + 10.94 106 V2 OM (SI units) If water is to be used as the fluidising medium, in actual operation, the above bed has a height = 1 m. What is the porosity of the fluidised bed ?
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A. 0.5

B. 0.2

C. 0.7

D. 0.8

6355. In hindered settling, the particles are_________________________?
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A. None of these

B. Placed farther from the wall

C. Near each other

D. Not affected by other particles and the wall

6356. Pressure drop in a packed bed for laminar flow is given by the ______________ equation?
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A. Blake-Plummer

B. Kozeny-Carman

C. Levas

D. Fanning friction factor

6357. The hydrodynamic and thermal boundary layers will merge, when ____________________?
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A. Schmidt number tends to infinity

B. Nusselt number tends to infinity

C. Archimedes number is greater than 10000

D. Prandtl number is one
6358. 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. 24/NRe,P

D. 16/NRe,P

6359. Nominal size of a pipe is an indication of its ______________ diameter?
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A. Outer

B. None of these

C. Approximate

D. Inner

6360. The fluid property, due to which, mercury does not wet the glass is__________________?
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A. Surface tension

B. Viscosity

C. Adhesion

D. Cohesion