Chemical Engineering MCQs

Page No. 455

A composite flat wall of a furnace is made of two materials ‘A’ and ‘B’. The thermal conductivity of ‘A’ is twice of that of material ‘B’, while the thickness of layer of ‘A’ is half that of B. If the temperature at the two sides of the wall are 400 and 1200°K, then the temperature drop (in °K) across the layer of material ‘A’ is________________?


a125


b133


c150


d160


View Answer 160

In forced convection, the heat transfer depends on _______________?


aRe, Pr


bRe, Gr


cMainly Gr


dRe only


View Answer Re, Pr

Kg of liquid evaporated per hour in an evaporator is defined as its_________________?


aCapacity


bEconomy


cSteam load


dNone of these


View Answer Capacity

In SI units, fouling factor is expressed in __________________?


am2°K/W


bW/m2°K


cm2°K


dm°K/W


View Answer m2°K/W

Radiation heat losses from satisfactorily insulated high pressure boiler may be about _____________ percent?


a1


b7


c18


d26


View Answer 7

In the free convection regime of pool boiling, the heat flux is proportional to__________________?


aΔt1/2


bΔt2


cΔt5/4


dΔt


View Answer Δt5/4

Prandtl number is given by__________________?


aCP μ/a


bhD/k


cCP μ/k


dμ/h CP


View Answer CP μ/k

Trap is used to remove ________________ from steam pipe lines?


aSteam


bCondensate


cNon-condensable


dNone of these


View Answer Condensate

Wavelength corresponding to the maximum energy is inversely proportional to the absolute temperature. This is ________________ law?


aStefan’s


bDalton’s


cWien’s


dKirchoff’s


View Answer Wien’s

Economy of a multiple effect evaporator depends upon the _____________________?


aHeat balance consideration


bRate of heat transfer


cBoth A. and B.


dNeither A. nor B.



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