Chemical Engineering MCQs

Page No. 447

Which of the following is not used as a medium for high temperature heating ?


aDowtherm


bMercury


cLiquid metal (e.g. molten sodium)


dFused salts (e.g., an eutectic mixture of 53% KNO3, 40% NaNO2and 7% NaNO3)


View Answer Mercury

The inside heat transfer co-efficient in case of turbulent flow of liquid in the tube side in a 1-2 shell and tube heat exchanger is increased by ______________ times, when the number of tube passes is increased to 8?


a20.8


b40.8


c40.4


d20.4


View Answer 40.8

In regenerative air preheater (as practised in heating of coke ovens), the heat is transferred_________________?


aThrough a metallic wall


bBy direct contact of hot flue gas with air


cBy heating an intermediate material (like chequor bricks) and then heating the air from this hot material


dNone of these



A multiple effect evaporator has a capacity to process 4000 kg of solid caustic soda per day, when it is concentrating from 10% to 25% solids. The water evaporated in kg per day is__________________?


a6000


b24000


c60000


d48000


View Answer 24000

The Nusselt number for fully developed (both thermally and hydrodynamically) laminar flow through a circular pipe whose surface temperature remains constant is______________?


a1.66


b88.66


c3.66


dDependent on NRe only


View Answer 3.66

Which characteristic of a fluid is not important in deciding its route in a shell and tube heat exchanger ?


aCorrosiveness


bFouling characteristic


cViscosity


dNone of these


View Answer None of these

What is the absorptivity of a black body?


a1


b0


c0.78


d0.95


View Answer 1

Economy of a multiple effect evaporator is not influenced much by the_______________________?


aBoiling point elevations


bTemperature of the feed


cRate of heat transfer


dRatio of the weight of the thin liquor to thick liquor



Asymptotic conditions is reached, when for a fluid flowing in laminar flow through a long tube___________________?


aExit-fluid temperature > wall temperature


bExit fluid temperature < wall temperature


cExit fluid temperature = wall temperature


dGraetz number > 100



In case of evaporators, liquid entrainment results primarily due to_________________?


aHigh vacuum in the evaporator


bHigh evaporation rate


cFoaming of the solution


dHigh heat transfer rate



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