Chemical Engineering MCQs

Page No. 453

Multiple effect evaporators are commonly used in the manufacture of P. Paper Q. Superphosphate R. Sugar S. Fats ?


aP and Q


bP and R


cP and S


dR and S


View Answer P and S

Air is to be heated by condensing steam. Two heat exchangers are available (i) a shell and tube heat exchanger and (ii) a finned tube heat exchanger. Tube side heat transfer area are equal in both the cases. The recommended arrangement is________________?


aFinned tube heat exchanger with air inside and steam outside


bFinned tube heat exchanger with air outside and steam inside


cShell and tube heat exchanger with air inside tubes and steam on shell side


dShell and tube heat exchanger with air on shell side and steam inside tubes



Heat exchanger tubes are never made of_________________?


aPlain carbon steel


bStainless steel


cLead


dCopper


View Answer Lead

The variation of thermal conductivity of a metal with temperature is often correlated using an expression of the form K = K0 + at, where, K is the thermal conductivity and T is the temperature (in °K). The units of ‘a’ in SI system will be________________?


aW/m.k


bW/m


cW/m.k2


dNone, ‘a’ is just a number


View Answer W/m.k2

Colburn analogy is applicable for the value of Prandtl number from_________________?


a0.001 to 1


b0.6 to 120


c0.5 to 5


d120 to 400


View Answer 0.6 to 120

For what value of Prandtl number, the Col-burn analogy is valid ?


a0.06 to 120


b0.6 to 120


c1 to 103


d1 to 50


View Answer 0.6 to 120

The thermal efficiency of a reversible heat engine operating between two given thermal reservoirs is 0.4. The device is used either as a refrigerator or as a heat pump between the same reservoirs. Then the coefficient of performance as a refrigerator (COP)R and the co-efficient of performance as a heat pump (COP)HP are _______________?


a(COP)R = (COP)HP = 0.6


b(COP)R = 2.5; (COP)HP = 1.5


c(COP)R = 1.5; (COP)HP = 2.5


d(COP)R = (COP)HP = 2.5



Heat transfer rate per unit area is called_________________?


aThermal conductivity


bHeat flux


cHeat transfer co-efficient


dThermal diffusivity


View Answer Heat flux

Tube pitch is the _______________ of tube diameters and the clearances?


aSum


bDifference


cRatio


dNone of these


View Answer Sum

A black body when hot, emits heat radiation of _____________ wavelengths?


aSmall


bLarge


cAll


dOne fixed


View Answer All

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