Prelim

Question 1

The total Gibbs Free Energy for all phases in a multiphase, multicomponent system is

Answer 1

Minimum

Question 2

The ratio of mole fractions of a species present in liquid-liquid equilibrium

Answer 2

distribution coefficient

Question 3

For non ideal liquid solutions the model for correlating liquid-phase activity coefficients of binary pairs that uses local area fraction as the primary concentration variable rather than local volume or mole fractions

Answer 3

UNIQUAC

Question 4

A solution is ideal when activity coefficients are all equal to

Answer 4

1

Question 5

Fugacity as a substitute for chemical potential in phase equilibria calculations was proposed by

Answer 5

Lewis

Question 6

For systems in equilibrium, the given species in each existing phase has equality of phase

Answer 6

chemical potential

Question 7

Graphical correlations of pure component thermodynamic properties are widely available for an solution at near

Answer 7

Ambient Pressure

Question 8

The approximate expression for estimating K-value for non ideal liquid solutions at moderate pressure and below the critical temperature

Answer 8

Poynting correction

Question 9

The ratio for the equilibrium ratios for vapor-liquid systems is the

Answer 9

Relative Volatility

Question 10

For a pure ideal gas, fugacity is equal to

Answer 10

Pressure

Question 11

Equation that provides the quantitative measure of the thermodynamic inefficiency of the process

Answer 11

Availability Balance

Question 12

Dissolving pharmaceutical products from bark or roots of plants employs

Answer 12

Leaching

Question 13

For non ideal vapor and liquid mixtures containing non polar components which of the following equations can be used to estimate activity coefficients, volume and Enthalpy of mixing and K values

Answer 13

SR
PR
LKP
So All of these

Question 14

The equivalent work of separation for an irreversible process is given by

Answer 14

Lost work + Minimum work

Question 15

Which of the following describes activity

Answer 15

ratio of partial fugacity of a component to its fugacity in some defined standard state

Question 16

Which of the following equations of state for non ide vapor and liquid mixtures does not use acentric factor

Answer 16

Redlich-Kwong

Question 17

For a pure ideal gas, fugacity equals

Answer 17

Total Pressure

Question 18

Which is true about lost work in a separation operation

Answer 18

the greater its value the greater the energy inefficiency

Question 19

The simplest model of when both vapor and liquid are ideal solutions and the vapor is an ideal gas applies only at near ambient pressure up to about

Answer 19

50 psia

Question 20

Which is not true about availability

Answer 20

is conserved in a real irreversible process

Question 21

Fick’s law of Diffusion is an extension of

Answer 21

Fourier’s Law of heat conduction

Question 22

Which of the following is not true about binary equimolar counterdiffusion

Answer 22

at constant molar density Dab = - Dba

Question 23

For equimolar mixture of A and B, in unimolecular diffusion, mass transfer of component A in stagnant B, if 1 - Xa is 0.5, then

Answer 23

NA = 2JA

Question 24

For estimating the diffusivity in gas mixtures, which of the following equations can be used

Answer 24

Chapman-Enskog Equation

Question 25

The Nernst-Haskell equation is used to estimating diffusion coefficients of

Answer 25

electrolytes

Question 26

For steady state, one dimensional molecular diffusion through stationary medium B, with constant DAB, the molar rate of mass transfer of A for plane wall is proportional to, EXCEPT

Answer 26

thickness
( it is proportional to diffusivity, area, and concentration gradient)

Question 27

The model for mass transfer at fluid-fluid interface most useful when mass transer involves bubbles or droplets or flow over random packing

Answer 27

Penetration theory

Question 28

The total molar rate of absorption of A through a falling liquid film B is directly proportional to

Answer 28

film thickness
film width
concentration gradient

Question 29

The mass transfer coefficient for component A is given by

Answer 29

kc = nA/A∆CA

Question 30

Used to estimate the values of heat and mass transfer coefficients from experimental measurements of the Fanning friction factor for turbulent flow at Npy= Nsc= 1

Answer 30

Reynolds Analogy