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

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bP and R

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cP and S

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dR and S

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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

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bFinned tube heat exchanger with air outside and steam inside

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

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

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Heat exchanger tubes are never made of_________________?


aPlain carbon steel

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bStainless steel

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cLead

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dCopper

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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

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bW/m

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cW/m.k2

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dNone, ‘a’ is just a number

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View Answer W/m.k2

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


a0.001 to 1

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b0.6 to 120

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c0.5 to 5

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d120 to 400

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View Answer 0.6 to 120

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


a0.06 to 120

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b0.6 to 120

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c1 to 103

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d1 to 50

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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

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

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

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

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Heat transfer rate per unit area is called_________________?


aThermal conductivity

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bHeat flux

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cHeat transfer co-efficient

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dThermal diffusivity

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View Answer Heat flux

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


aSum

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bDifference

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cRatio

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dNone of these

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View Answer Sum

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


aSmall

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bLarge

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cAll

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dOne fixed

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View Answer All

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