Chemical Engineering Basics

Question: A cylinderical rod subjected to a tensile strain within the elastic limit undergoes a volume change. If the volume strain is equal to half the tensile strain, then the Poisson’s ratio of the rod is
[A].

0

[B].

0.33

[C].

0.44

[D].

0.25

Answer: Option C

Explanation:

No answer description available for this question.

Question: A metal having a Poisson’s ratio = 0.3 is elastically deformed under uniaxial tension. If the longitudinal strain = 0.8, then the magnitude of thickness strain is
[A].

-0.8

[B].

0.8

[C].

+0.08

[D].

-0.24

Answer: Option D

Explanation:

No answer description available for this question.

Question: One face of a furnace wall is at 1030°C and the other face is exposed to room temperature (30°C). If the thermal conductivity of furnace wall is 3 W . m-1 . k-1 and the wall thickness is 0.3 m, the maximum heat loss (in W/m) is
[A].

100

[B].

900

[C].

9000

[D].

10000

Answer: Option D

Explanation:

No answer description available for this question.

Question: Consider the equilibrium A(g) + B(g) = AB(g). When the partial pressure of A is 10-2 atm, the partial pressure of B is 10-3 atm and the partial pressure of AB is 1 atm, the equilibrium constant ‘K’ is
[A].

10 atm-1

[B].

105 atm-1

[C].

10 (dimensionless)

[D].

105 (dimensionless)

Answer: Option B

Explanation:

No answer description available for this question.

Question: If Reynolds number is greater than 1, then the
[A].

viscous force is larger than the inertia force.

[B].

inertia force is larger than the viscous force.

[C].

inertia force is larger than the surface tension force.

[D].

inertia force is larger than the gravitational force.

Answer: Option B

Explanation:

No answer description available for this question.

Question: At absolute zero temperature, for any reaction involving condensed phases
[A].

Δ G° = 0 , Δ H° = 0

[B].

Δ H° = 0 , Δ S° = 0

[C].

Δ S° = 0 , Δ E° = 0

[D].

Δ S° = 0 , Δ Cp° = 0

Answer: Option C

Explanation:

No answer description available for this question.

Question: In a totally irreversible isothermal expansion process for an ideal gas, ΔE = 0, ΔH = 0. Then ΔQ and ΔS will be
[A].

ΔQ = 0, ΔS=0

[B].

ΔQ = 0 , ΔS = +ve

[C].

ΔQ = 0, ΔS = -ve

[D].

ΔQ = +ve , ΔS= +ve

Answer: Option B

Explanation:

No answer description available for this question.

Question: Consider an ideal solution of components A and B. The entropy of mixing per mole of an alloy containing 50 wt% B is
[A].

R ln 2

[B].

-R ln 2

[C].

3 R ln 2

[D].

-3R ln 2

Answer: Option A

Explanation:

No answer description available for this question.

Question: For a first order chemical reaction, the concentration of the reactant decreases __________ with time.
[A].

linearly

[B].

exponentially

[C].

logarithmically

[D].

inversely

Answer: Option A

Explanation:

No answer description available for this question.

Question: For a spontaneous natural process at constant temperature and pressure, the free energy of the system always
[A].

increases.

[B].

decreases.

[C].

remains constant.

[D].

increases to a maximum before decreasing.

Answer: Option A

Explanation:

No answer description available for this question.