Chemical Engineering MCQs

Page No. 440

Convective heat transfer co-efficient in case of fluid flowing in tubes is not affected by the tube length/diameter ratio, if the flow is in the _____________ zone?


aLaminar


bTransition


cBoth A & B


dHighly turbulent


View Answer Highly turbulent

Which of the following is unimportant in forced convection ?


aReynolds number


bPrandtl number


cGrashoff number


dNone of these


View Answer Grashoff number

Steam consumption in kg/hr in case of an evaporator is given by (where, C & E are capacity the economy of the evaporator respectively) ?


aC/E


bE/C


cCE


d1/CE


View Answer C/E

Dittus-Boelter equation cannot be used for molten metals mainly due to its very low_____________________?


aPrandtl number


bGrashoff number


cThermal conductivity


dViscosity


View Answer Prandtl number

The heat flux (from outside to inside) across an insulating wall with thermal conductivity, K = 0.04 W/m.°K and thickness 0.16m is 10 W/m2. The temperature of the inside wall is – 5°C. The outside wall temperature is___________________?


a25°C


b30°C


c35°C


d40°C


View Answer 35°C

In a multipass shell and tube heat exchanger, tube side return pressure loss is equal to _____________ the velocity head?


aTwice


bFour times


cSquare root of


dSquare of


View Answer Four times

Heat produced when a steady state current, I passes through an electrical conductor having resistance, ‘R’ is___________________?


aIR


bI2R


cIR2


dI2R2


View Answer I2R

The heat transfer by radiation from a mild steel surface is to be reduced by reducing the emissivity of the surface. This can be best achieved by__________________?


aPainting the surface black


bPainting the surface white (with aluminium paint)


cGiving the surface a mirror finish


dRoughening the surface



Fourier’s law applies to the heat transfer by__________________?


aConvection


bRadiation


cConduction


dAll A., B. & C.


View Answer Conduction

As per Kirchoff‟s law, the ratio of the total radiating power to the absorptivity of a body depends on the_______________?


aTemperature of the body only


bWavelength of monochromatic radiation


cBoth A. and B.


dNature of material of body



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