CHEMICAL ENGINEERING

Question: During solid state sintering of powders, the following mechanism can be active.
[A].

Evaporation and condensation.

[B].

Solid state diffusion processes.

[C].

Liquid formation in grain boundaries.

[D].

Creation of more dislocations.

Answer: Option B

Explanation:

No answer description available for this question.

Question: A simple closed grinding circuit may consist of
[A].

a ball mill and a classifier.

[B].

a rod mill and a hydrocyclone.

[C].

a jaw crusher and a hydrocyclone.

[D].

a ball mill and a froth floatation cell.

Answer: Option A

Explanation:

No answer description available for this question.

Question: Fatigue life is expected to increase by
[A].

increasing the size of the sample.

[B].

smooth polishing of the surface of the sample.

[C].

having compressive residual stresses at the surface.

[D].

having tensile residual stresses at the surface.

Answer: Option C

Explanation:

No answer description available for this question.

Question: Cementite is in the lamellar form in the __________ phase of steel.
[A].

martensitic

[B].

bainitic

[C].

pearlitic

[D].

ferritic

Answer: Option C

Explanation:

No answer description available for this question.

Question: A material having good damping property is likely to have
[A].

greater defect density.

[B].

fine grained structure.

[C].

lesser defect density.

[D].

high tensile strength.

Answer: Option A

Explanation:

No answer description available for this question.

Question: In multipass welds, shot peening is done after each pass to
[A].

close the surface porosity.

[B].

break the continuity of columnar grains.

[C].

flatten the weldment.

[D].

introduce texture in the weld.

Answer: Option A

Explanation:

No answer description available for this question.

Question: A particle is settling in a liquid under Stokesian conditions. The free falling velocity of the particle is proportional to
[A].

particle diameter

[B].

particle diameter

[C].

(particle diameter)2

[D].

(particle diameter)3

Answer: Option B

Explanation:

No answer description available for this question.

Question: If a solid is compressed adiabatically in its elastic range, its __________ remains constat
[A].

internal energy

[B].

enthalpy

[C].

entropy

[D].

temperature

Answer: Option C

Explanation:

No answer description available for this question.

Question: A thermally thin body is the one for which
[A].

Biot number is less than 0.1.

[B].

Gallileo number is less than 0.1.

[C].

Fourier number is less than 0.1.

[D].

Fourier number is greater than 0.1.

Answer: Option A

Explanation:

No answer description available for this question.

Question: In fluid flow, and heat and mass transfer, one encounters (i) kinematic velocity (μ), (ii) molecular diffusivity (θ) and thermal diffusivity (α). The units of these quantities are.
[A].

μ , α and θ all have units of m/s.

[B].

μ , α and θ all have units of m2/s.

[C].

α and θ have units of m2/s, while μ has unit of m/s.

[D].

α and θ have units of m/s, while μ has unit of m2/s.

Answer: Option C

Explanation:

No answer description available for this question.