Chemical Engineering MCQs

Page No. 463

Thermal diffusivity of a material __________________?


aHas the unit m2 /sec

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bIs defined as K/ρ . Cp

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cIs the ratio of thermal conductivity to thermal capacity

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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

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bHeat flux

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cThat across the entire pipe

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dNone of these

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What is the unit of thermal conductivity ?


aKcal/hr. m2 °C

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bKcal/hr.m.°C

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cKcal/hr.m

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dKcal/hr. °C

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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

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bBoth the tube sheets floating

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cThe top tube sheet floating and bottom tube sheet fixed

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

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What is the emissivity of a black body ?


a0

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b1

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c0.5

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d0.90

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View Answer 1

In SI units, thermal conductivity is expressed in__________________?


aWatt/m.°K

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bWatt/m2. °K

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cWatt/m2. °K

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dWatt/m4. °K

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View Answer Watt/m.°K

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


aConduction only

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bForced convection only

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cForced convection and conduction

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dFree and forced convection

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


aThermal conductivity

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bThickness

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cTemperature difference

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dHeat transfer area

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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

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bDecrease

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cRemain unchanged

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dEither increase or decrease; depends on the coolant flow rate

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View Answer Remain unchanged

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


aPlanck’s law

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bKirchhoff’s law

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cWien’s law

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dStefan-Boltzmann law

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View Answer Planck’s law

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