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

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bLeast at the outlet of the last effect

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cHighest at the inlet of the last effect

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dHighest at the outlet of the last effect

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Which of the following has the minimum absorptivity ?


aAluminium foil

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bCoal dust

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cRefractory bricks

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dIron plates

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View Answer Aluminium foil

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


aFourier’s law

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bNewton’s law of cooling

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cFick’s law

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dNone of these

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


aAlways less than h1

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bAlways between h1 and h2

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cAlways higher than h2

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dDependent on metal resistance

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


aFlows through the tube

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bFlows outside the tubes

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cCan flow either inside or outside the tubes

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dShould not be used as it gives very high pressure drop

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


ar = 2k/h

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br = k/h

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cr = k/2h

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dr = h/k

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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

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bChemical potentials

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cActivity co-efficients

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dMass transfer co-efficients

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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

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bLess than that of the un-insulated steam pipe

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cEqual to that of the un-insulated steam pipe

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dLess than the steam pipe with 5 cms insulation

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


aEconomiser

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bRegenerator

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cCeramic recuperator

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dNone of these

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View Answer None of these

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


aVelocity of circulation

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bLiquor-film co-efficient

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cBoth A. and B.

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dNeither A. and B.

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View Answer Neither A. and B.

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