Chemical Engineering MCQs

Page No. 435

Unsteady state heat conduction occurs, when_______________?


aTemperature distribution is independent of time


bTemperature distribution is dependent on time


cHeat flows in one direction only


dThree dimensional heat flow is concerned



For specified tube outside diameter, higher BWG means higher___________________?


aTube thickness


bCross-sectional area


cWeight per unit length


dNone of these


View Answer Cross-sectional area

A long iron rod initially at a temperature of 20°C has one end dipped in boiling water (100°C) at time, t = 0. The curved surface of the rod is insulated so that heat conduction is one dimensional in the axial direction. The temperature at a distance 100 mm from the dipped end becomes 40°C at time, t = 200 s. The same temperature is achieved at a distance of 200 mm from the dipped end at time ___________________?


at = 283 s


bt = 356 s


ct = 400 s


dt = 800 s


View Answer t = 800 s

Value of Prandtl number for water ranges from_________________?


a1 to 2


b5 to 10


c100 to 500


d1000 to 2000


View Answer 5 to 10

For a fluid flowing in an annulus space, the wetted perimeter for heat transfer and pressure drop are__________________?


aSame


bDifferent


cNever different


dLinearly related


View Answer Different

1000 kg of wet solids are to be dried from 60% to 20% moisture (by weight). The mass of moisture removed in kg is__________________?


a520


b200


c400


d500


View Answer 400

Dropwise condensation occurs on ______________ surfaces?


aClean and dirt free


bSmooth clean


cContaminated cooling


dPolished


View Answer Contaminated cooling

Conduction occurs in the buffer zone for a fluid flowing through a heated pipe, only when Prandtl number is________________?


a0.1


b> 1


c< 1


d1


View Answer 0.1

The type of liquor circulation system to be ‘ employed in evaporators (viz. natural or forced circulation) is determined mainly by the ______________ of the liquid?


aViscosity


bDensity


cThermal conductivity


dCorrosive nature


View Answer Viscosity

For a given ambient air temperature with increase in the thickness of insulation of a hot cylindrical pipe, the rate of heat loss from the surface would ?


aDecrease


bIncrease


cFirst decrease and then increase


dFirst increase and then decrease



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