Chemical Engineering MCQs

Page No. 449

In a forward feed multiple effect, the pressure build up will be____________________?


aLeast at the inlet of the first effect


bLeast at the outlet of the last effect


cHighest at the inlet of the last effect


dHighest at the outlet of the last effect



Which of the following has the minimum absorptivity ?


aAluminium foil


bCoal dust


cRefractory bricks


dIron plates


View Answer Aluminium foil

Convective heat transfer, in which heat is transferred by movement of warmed matter is described by___________________?


aFourier’s law


bNewton’s law of cooling


cFick’s law


dNone of these



If h1 = inner film co-efficient and /h2 = outer film co-efficient, then the overall heat transfer co-efficient is________________?


aAlways less than h1


bAlways between h1 and h2


cAlways higher than h2


dDependent on metal resistance



In an extended surface heat exchanger, fluid having lower co-efficient________________?


aFlows through the tube


bFlows outside the tubes


cCan flow either inside or outside the tubes


dShould not be used as it gives very high pressure drop



The critical radius ‘r’ of insulation on a pipe is given by____________________?


ar = 2k/h


br = k/h


cr = k/2h


dr = h/k


View Answer r = k/h

In an interphase heat transfer process, the equilibrium state corresponds to equality of temperature in the two phases, while the condition for equilibrium in an interphase mass transfer process is equality of___________________?


aConcentrations


bChemical potentials


cActivity co-efficients


dMass transfer co-efficients


View Answer Concentrations

A 10 cm dia steam pipe, carrying steam at 180°C, is covered with an insulation (conductivity = 0.6 W/m.°C). It losses heat to the surroundings at 30°C. Assume a heat transfer co-efficient of 0.8 W/m2.°C for heat transfer from surface to the surroundings. Neglect wall resistance of the pipe and film resistance of steam. If the insulation thickness is 2 cms, the rate of heat loss from this insulated pipe will be__________________?


aGreater than that for un-insulated steam pipe


bLess than that of the un-insulated steam pipe


cEqual to that of the un-insulated steam pipe


dLess than the steam pipe with 5 cms insulation



Sensible heat of hot industrial flue gases cannot be recovered by a/an________________?


aEconomiser


bRegenerator


cCeramic recuperator


dNone of these


View Answer None of these

In case of a vertical tube evaporator, with increase in the liquor level, the ____________ is increased?


aVelocity of circulation


bLiquor-film co-efficient


cBoth A. and B.


dNeither A. and B.


View Answer Neither A. and B.

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