Chemical Engineering Basics

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.

Question: The cathode in an electrochemical cell always carries
[A].

negative charge.

[B].

positive charge.

[C].

zero charge.

[D].

positive or negative charge depending upon the nature of the cell.

Answer: Option A

Explanation:

No answer description available for this question.

Question: The bulk modulus of a material with Poisson’s ratio of 0.5 is equal to
[A].

3 x Young’s modulus

[B].

Young’s modulus

[C].

infinity

[D].

zero

Answer: Option C

Explanation:

No answer description available for this question.

Question: FeO (s) + CO (g) = Fe (s) + CO2 (g), k = 0. 435 at 1173E; At equilibrium, what will be the number of moles of CO gas required to reduce one mole of FeO at 1173 K?
[A].

1.0

[B].

1.3

[C].

2.3

[D].

3.3

Answer: Option D

Explanation:

No answer description available for this question.

Question: For the irreversible reaction, Ca+ 2C = Ca C2 , Δ H°298 = – 60000 J . mole-1 . If a system initially containing 2 moles of calcium, 3 moles of carbon and 1 mole of calcium carbide is allowed to react to completion, the heat evolved at 298 K will be
[A].

30000 J

[B].

60000 J

[C].

90000 J

[D].

240000 J

Answer: Option C

Explanation:

No answer description available for this question.