Chemical Engineering MCQs

Page No. 227

What is the unit of kinematic viscosity in SI unit ?


aM2/sec


bN/m2. sec


cKg. sec/m


dNone of these


View Answer M2/sec

A rectangular surface 3′ × 4′, has the lower 3 edge horizontal and 6′ below a free oil surface (sp. gr. 0.8). The surface inclination is 300 with the horizontal. The force on one side of the surface is (where, y = specific weight of water) ?


a39.6y


b48y


c49.2y


d58y


View Answer 48y

A bed of spherical particles (specific gravity 2.5) of uniform size 1500 μm is 0.5 m in diameter and 0.5 m high. In packed bed state, the porosity may be taken as 0.4. Ergun’s equation for the above fluid-particle system (in SI units) is given below: Δ 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 ?


a0.2


b0.5


c0.7


d0.8


View Answer 0.7

In power law, δ = [A (du/dy)2 + B] then the fluid is__________________?


aNewtonian


bDilatant


cThixotropic


dRheopectic


View Answer Newtonian

Drag co-efficient for motion of spherical particles in a stationary fluid in the stoke’s law range is_________________?


a24/NRe,P


b16/NRe,P


c64/NRe,P


d48/NRe,P


View Answer 24/NRe,P

Terminal velocity is_____________________?


aA constant velocity with no acceleration


bA fluctuating velocity


cAttained after moving one-half of total distance


dNone of these



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


aSpeed of


bDiameter of


cFluid velocity leaving


dAll A., B. and C.


View Answer All A., B. and C.

In area meter (e.g., Rotameter), with increase in the fluid flow rate, the___________________?


aPressure drop increases linearly


bPressure drop is almost constant


cArea through which fluid flows does not vary


dNone of these



Minimum porosity for fluidisation is____________________?


aThat corresponding to static bed


bThat corresponding to completely fluidised bed


cThe porosity of the bed when true fluidisation begins


dLess than that of the’ static bed



Isothermal turbulent flow of a fluid results in decrease of its pressure, which depends on the______________?


aWall roughness


bReynolds number


cBoth A. & B.


dNeither A. nor B.


View Answer Both A. & B.

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