Effective diffusivity (DE) in a catalyst pellet is related to molecular diffusivity (DN) and Knudsen diffusivity (DK) as

Question: Effective diffusivity (DE) in a catalyst pellet is related to molecular diffusivity (DN) and Knudsen diffusivity (DK) as
[A].

DE = DM + DK

[B].

[C].

DE = DM . DE

[D].

DE = DN/DE

Answer: Option B

Explanation:

No answer description available for this question.

The Schmidt number which is defined as, μ/ρ D, is the ratio of the

Question: The Schmidt number which is defined as, μ/ρ D, is the ratio of the
[A].

momentum diffusivity to the mass dif-fusivity.

[B].

thermal diffusivity to the mass diffusivity.

[C].

momentum diffusivity to the thermal diffusivity.

[D].

none of these.

Answer: Option A

Explanation:

No answer description available for this question.

Rayon is superior to cotton in making gauge for wound treatment, because rayon

Question: Rayon is superior to cotton in making gauge for wound treatment, because rayon
[A].

is a synthetic polymer.

[B].

does not stick to the wound unlike cotton.

[C].

can absorb over 90% of its own weight of water.

[D].

both (b) and (c).

Answer: Option B

Explanation:

No answer description available for this question.

Sedimentation is a physical process used in wastewater treatment to

Question: Sedimentation is a physical process used in wastewater treatment to
[A].

remove particles that are less dense than water

[B].

remove particles that are more dense than water

[C].

remove the pertinacious material from the water

[D].

none of the above

Answer: Option B

Explanation:

No answer description available for this question.

The chemical oxygen demand (COD)measures the

Question: The chemical oxygen demand (COD)measures the
[A].

amount of oxygen required for growth of microorganisms in water

[B].

amount of oxygen that would be removed from the water in order to oxidize pollution

[C].

amount of oxygen required to oxidize the calcium present in waste water

[D].

none of the above

Answer: Option B

Explanation:

No answer description available for this question.