Single Equilibrium Stages and Flash Calculations

This is an MCQ-based quiz on the topic of Single Equilibrium Stages and Flash Calculations.

This includes the following:-

Binary Vapor-Liquid System
Multicomponent Flash, Bubble Point, and Dew Point Calculations
Solid-Liquid Systems
Gas-Liquid-Systems
Multiphase Systems

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What are the degrees of freedom if there are two components in two phases?

0 2 4 6

Which of the following is not true?

yB= 1- yA xB = 1-xA yA= 1- yB xB= 1- yB

Which of the following techniques is not used when the boiling point difference is too small?

Crystallization Adsorption Distillation Zone melting

Which of the following is correct definition of bubble point?

Boiling point Temperature at which bubbles start Temperature at which pressure of bubbles is highest Temperature at which first bubble comes

What is the definition of critical point?

The temperature or pressure beyond which the liquid-vapor cannot co-exist The temperature or pressure beyond which the liquid-liquid mixture cannot co-exist The temperature or pressure beyond which the vapor vanishes The temperature or pressure beyond which the bubbles start coming

What is the correct definition of dew point?

The point at which first drop of gas boils The point at which the first drop of liquid boils The point at which the first drop of gas condenses The point at which the bubble comes

When does the relative volatility vary little with pressure?

For broad boiling point mixture showing non-ideal behavior For narrow boiling point mixtures showing non-ideal behavior For narrow boiling point mixtures showing ideal behavior For broad boiling point mixtures showing idal behavior

From the knowledge of vapor pressures of components, a y=x equilibrium can be approximated using how many values of αA,B?

Zero One Two Three

Which of the following is untrue about Roult’s law?

P=PAsxA + PBsxB P=PAsxA + PBs(1-xA) P= PAsxA + PAs(1-xA) P=PsB + xA(PsA-PsB)

What does the solid-liquid separation operation don’t involve?

Gravity sedimentation Magnetic separation Filtration Centrifugation

What process happens in leaching?

A solvent separates a mixture Two solvents separate a mixture A solvent selectively dissolves one of the component The mixture is heated so that one solid sublimes and is separated.

What happens in an ideal leaching stage of a mixture of A and B?

The solvent dissolves Some B and some A The solvent dissolves none of A and all B The solvent dissolves all of A and B, which makes separation easier The solvent does not dissolves any of A and B

What increases the solute concentration?

Increasing viscosity of the liquid phases Decreasing viscosity of liquid phases Increasing temperature of liquid phases Decreasing temperature of liquid phases

What is a eutectic point?

A temperature at which the mixture boils The temperature at which the mixture gets out of equilibrium The temperature at which the components have same molar flow rates The temperature at which the mixture freezes

Which of the following is the correct formula for gibb’s phase rule?

F = c+p

F = c+p-2

F = c-p-2

F = c*p -2

Quiz/Test Summary

Title: Single Equilibrium Stages and Flash Calculations

Questions: 15

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