Chemical Engineering MCQs

Page No. 463

Thermal diffusivity of a material __________________?


aHas the unit m2 /sec


bIs defined as K/ρ . Cp


cIs the ratio of thermal conductivity to thermal capacity


dAll A., B. and C.


View Answer All A., B. and C.

Nusselt number is the ratio of the temperature gradient at the wall to_________________?


aTemperature difference


bHeat flux


cThat across the entire pipe


dNone of these



What is the unit of thermal conductivity ?


aKcal/hr. m2 °C


bKcal/hr.m.°C


cKcal/hr.m


dKcal/hr. °C


View Answer Kcal/hr.m.°C

Tubes are held between top and bottom tube sheets in Calandria type evaporator by keeping_________________?


aBoth the tube sheets fixed


bBoth the tube sheets floating


cThe top tube sheet floating and bottom tube sheet fixed


dThe top tube sheet fixed and the bottom tube-sheet floating



What is the emissivity of a black body ?


a0


b1


c0.5


d0.90


View Answer 1

In SI units, thermal conductivity is expressed in__________________?


aWatt/m.°K


bWatt/m2. °K


cWatt/m2. °K


dWatt/m4. °K


View Answer Watt/m.°K

In pipe flow, heat is transferred from hot wall to the liquid by__________________?


aConduction only


bForced convection only


cForced convection and conduction


dFree and forced convection



Heat transfer rate described by Fourier’s law will decrease, if the _____________ increases?


aThermal conductivity


bThickness


cTemperature difference


dHeat transfer area


View Answer Thickness

In a co-current double pipe heat exchanger used for condensing saturated steam over the inner tube, if the entrance and exit conditions of the coolant are interchanged, then the rate of condensation will___________________?


aIncrease


bDecrease


cRemain unchanged


dEither increase or decrease; depends on the coolant flow rate


View Answer Remain unchanged

Which one gives the monochromatic emissive power for black body radiation ?


aPlanck’s law


bKirchhoff’s law


cWien’s law


dStefan-Boltzmann law


View Answer Planck’s law

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