Chemical Engineering Thermodynamics MCQs

Question 1

Pick out the correct statement.

Accepted Answer

A real gas on expansion in vacuum cools down whereas ideal gas remains unaffected

Answer

A real gas on expansion in vacuum gets heated up

Answer

An ideal gas on expansion in vacuum gets cooled

Answer

An ideal gas on expansion in vacuum gets heated up

Question 2

An irreversible process

Accepted Answer

Yields an amount of work less than that of a reversible process

Answer

Is the analog of linear frictionless motion in machines

Answer

Is an idealised visualisation of behaviour of a system

Answer

Yields the maximum amount of work

Question 3

Solid and liquid phases of a substance are in equilibrium at the

Accepted Answer

Both B and C

Answer

Critical temperature

Answer

Melting point

Answer

Freezing point

Question 4

A gas has a volume of 27.3 c.c. at 0°C. Its volume at 10°C (if pressure remains unchanged) will be __________ c.c.

Accepted Answer

28.3

Answer

2.73

Answer

273

Answer

283

Question 5

__________ explains the equilibrium constant for any chemical reaction.

Accepted Answer

Law of mass action

Answer

Henry's law

Answer

Hess's law

Answer

None of these

Question 6

The root mean square speed of molecules of a gas is equal to (where, m = mass of the molecule K = Boltzman's constant, T = absolute temperature)

Accepted Answer

$$\sqrt {\frac{{3{	ext{KT}}}}{{	ext{m}}}} $$

Answer

$$\sqrt {\frac{{2{	ext{KT}}}}{{	ext{m}}}} $$

Answer

$$\sqrt {\frac{{6{	ext{KT}}}}{{	ext{m}}}} $$

Answer

$$\frac{{3{	ext{KT}}}}{{	ext{m}}}$$

Question 7

The number of degrees of freedom for an azeotropic mixture in a two component vapour-liquid equilibria is/are

Accepted Answer

One

Answer

Zero

Answer

Two

Answer

Three

Question 8

Compressibility factor for almost all the gases are approximately same at the same

Accepted Answer

Reduced pressure and reduced temperature

Answer

Pressure and temperature

Answer

Critical pressure and critical temperature

Answer

None of these

Question 9

At triple point (for one component system), vapour pressure of solid as compared to that of liquid will be

Accepted Answer

Same

Answer

More

Answer

Less

Answer

More or less ; depending on the system