CHEMICAL ENGINEERING THERMODYNAMICS QUIZ

Which of the following is not a reversible process ?

Solution of NaCl in water at 50°C

Atmospheric pressure vaporisation of water at 100°C

None of these

Expansion of an ideal gas against constant pressure

TRUE ANSWER : ?
YOUR ANSWER : ?

Pick out the undesirable property for a good refrigerant.

Low freezing point

High thermal conductivity

Large latent heat of vaporisation

High viscosity

TRUE ANSWER : ?
YOUR ANSWER : ?

The molar excess Gibbs free energy, gE, for a binary liquid mixture at T and P is given by, (gE/RT) = A . x₁. x₂, where A is a constant. The corresponding equation for ln y₁, where y₁ is the activity co-efficient of component 1, is

A . x₂²

Ax₁

Ax₂

Ax₁²

TRUE ANSWER : ?
YOUR ANSWER : ?

The equation DU = Tds - PdV is applicable to infinitesimal changes occuring in

A closed system with changes in composition

An open system of constant composition

An open system with changes in composition

A closed system of constant composition

TRUE ANSWER : ?
YOUR ANSWER : ?

For an ideal gas, the chemical potential is given by

R dlnf

None of these

RT dlnP

R dlnP

TRUE ANSWER : ?
YOUR ANSWER : ?

With increase in pressure (above atmospheric pressure), the Cp of a gas

Remains unchanged

First decreases and then increases

Decreases

Increases

TRUE ANSWER : ?
YOUR ANSWER : ?

PVy = constant, holds good for an isentropic process, which is

Adiabatic and irreversible

Isothermal and irreversible

Reversible and isothermal

Reversible and adiabatic

TRUE ANSWER : ?
YOUR ANSWER : ?

For an ideal solution, the value of activity co-efficient is

1

> 1

< 1

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is a thermodynamic property of a system?

Entropy

Mass

Concentration

Temperature

TRUE ANSWER : ?
YOUR ANSWER : ?

Change of state namely evaportation condensation, freezing and melting is an __________ process.

Isothermal

Isochoric

Isobaric

Adiabatic

TRUE ANSWER : ?
YOUR ANSWER : ?

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