Chemical Engineering Thermodynamics

Question: “When a system in equilibrium is subjected to a change in temperature, pressure or concentration, the equilibrium is displaced in a direction which tends to undo the effect of the change.” This is called the
[A].

Le-Chatelier principle.

[B].

Kopp’s rule.

[C].

law of corresponding state.

[D].

Arrehenius hypothesis.

Answer: Option A

Explanation:

No answer description available for this question.

Question: Heat requirement for decomposition of a compound into its elements is __________ that is evolved during the formation of that compound from its elements.
[A].

the same

[B].

less than

[C].

greater than

[D].

different than

Answer: Option A

Explanation:

No answer description available for this question.

Question: Work done may be calculated by the expression for __________ processes.
[A].

non-flow reversible

[B].

adiabatic

[C].

both (a) and (b)

[D].

neither (a) nor (b)

Answer: Option C

Explanation:

No answer description available for this question.

Question: Internal energy of an element at 1 atm and 25° C is __________ kcal/kg.mole.
[A].

0

[B].

273

[C].

25

[D].

none of these

Answer: Option A

Explanation:

No answer description available for this question.

Question: During adiabatic expansion of gas
[A].

pressure remains constant.

[B].

pressure is increased.

[C].

temperature remains constant.

[D].

none of these.

Answer: Option D

Explanation:

No answer description available for this question.

Question: “When a gas is expanded from high pressure region to low pressure region ; temper -ature change occurs”. This phenomenon is related to the
[A].

Gibbs-Duhem equation

[B].

Gibbs-Helmholtz equation

[C].

Third law of thermodynamics

[D].

Joule-Thomson effect

Answer: Option D

Explanation:

No answer description available for this question.

Question: If heat contents of CH4, C2H4 and C3H8 are -17.9, 12.5 and -24.8 kcal/mole respectively, than ΔH for the reaction CH4(g) + C2H4(g) C3H8(g) will be __________ Kcal.
[A].

-19.4

[B].

-30.2

[C].

55.2

[D].

-55.2

Answer: Option A

Explanation:

No answer description available for this question.

Question: “Law of corresponding states” says that
[A].

, two different gases behave similarly, if their reduced properties (i.e. P, V and T) are same.

[B].

the surface of separation (i. e. the meniscus) between liquid and vapour phase disappears at the critical temperature.

[C].

no gas can be liquified above the critical temperature, howsoever high the pressure may be.

[D].

the molar heat of energy of gas at constant volume should be nearly constant (about 3 calories).

Answer: Option A

Explanation:

No answer description available for this question.

Question: In polytropic process (PVn = constant), if n = 1; it means a/an __________ process.
[A].

adiabatic

[B].

reversible

[C].

isothermal

[D].

none of these

Answer: Option C

Explanation:

No answer description available for this question.

Question: In case of a close thermodynamic system, there is __________ across the boundaries.
[A].

no heat and mass transfer

[B].

no mass transfer but heat transfer

[C].

mass and energy transfer

[D].

none of these

Answer: Option B

Explanation:

No answer description available for this question.