Chemical Engineering MCQs

Page No. 156

Free energy, fugacity and activity co-efficient are all affected by change in the temperature. The fugacity co-efficient of a gas at constant pressure ______________ with the increase of reduced temperature?


a Decreases


b Increases


cRemains constant


dDecreases logarithmically


View Answer Increases

A Newtonian liquid (ρ = density, μ = viscosity) is flowing with velocity „v‟ in a tube of diameter ‘D’. Let Δp be the pressure drop across the length ‘L’. For a laminar flow, Δp is proportional to_________________?


aLρv2/D


bLμV/D2


cDρv2/L


dμV/L


View Answer Lρv2/D

Entropy change of the reaction, H2O (liquid) → H2O (gas), is termed as the enthalpy of___________________?


aSolution


bVaporisation


cFormation


dSublimation


View Answer Vaporisation

An equipotential line is _____________ to the velocity vector at every point?


aNormal


bParallel


cTangential


dNone of these


View Answer Normal

The effect of changing the evaporator temperature on COP as compared to that of changing the condenser temperature (in vapour compression refrigeration system) is__________________?


aLess pronounced


bMore pronounced


cEqual


d Data insufficient, can’t be predicted


View Answer More pronounced

The nominal size of a hose pipe is specified by its _________________?


aI.D.


bO.D.


cThickness


dNone of these


View Answer I.D.

What happens in a reversible adiabatic expansion process ?


aHeating takes place


bCooling takes place


cPressure is constant


dTemperature is constant


View Answer Cooling takes place

The equivalent diameter for pressure drop calculation for a fluid flowing through a rectangular cross-section channels having sides ‘x’ & ‘y’ is given by_________________?


a2xy/(x + y)


bxy/(x + y)


c(x + y)/2xy


d(x + y)/xy


View Answer 2xy/(x + y)

Number of phases in a colloidal system is_____________________?


a1


b2


c3


d4


View Answer 2

For liquid flow through a packed bed, the superficial velocity as compared to average velocity through the channel in the bed is________________?


aMore


bLess


cEqual


dIndependent of porosity


View Answer Less

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