Chemical Reaction Engineering

Question: Mean residence time is equal to the space time, when
[A].

the feed rate is measured at temperature and pressure in the reactor.

[B].

the temperature, pressure and the density of reaction mixture remains constant throughout the reactor.

[C].

there is no change in number of moles in gaseous reaction.

[D].

all (a), (b) and (c).

Answer: Option D

Explanation:

No answer description available for this question.

Question: Helium-mercury method can be used to determine the __________ of the catalyst particle.
[A].

pore volume

[B].

solid density

[C].

porosity

[D].

all (a), (b), & (c).

Answer: Option D

Explanation:

No answer description available for this question.

Question: BET apparatus
[A].

measures the catalyst surface area directly.

[B].

operates at very high pressure.

[C].

is made entirely of stainless steel.

[D].

none of these.

Answer: Option D

Explanation:

No answer description available for this question.

Question: If pore diffusion is the controlling step in a solid catalysed reaction, the catalyst
[A].

porosity is very important.

[B].

porosity is of less importance.

[C].

internal surface area is utilised efficiently.

[D].

none of these.

Answer: Option B

Explanation:

No answer description available for this question.

Question: BET apparatus is used to determine the
[A].

specific surface of a porous catalyst.

[B].

pore size distribution.

[C].

pore diameter.

[D].

porosity of the catalyst bed.

Answer: Option A

Explanation:

No answer description available for this question.

Question: In case of staged packed bed reactors carrying out exothermic reaction, use
[A].

high recycle for pure gas.

[B].

plug flow for dilute liquid requiring no large preheating of feed.

[C].

cold shot operations for a dilute solution requiring large preheating to bring the stream upto the reaction temperature.

[D].

all (a), (b) and (c).

Answer: Option D

Explanation:

No answer description available for this question.

Question: For high conversion in a highly exothermic solid catalysed reaction, use a __________ bed reactor.
[A].

fixed

[B].

fluidised bed reactor followed by a fixed

[C].

fixed bed reactor followed by a fluidised

[D].

fluidised

Answer: Option B

Explanation:

No answer description available for this question.

Question: Kinetics of a solid catalysed reaction can best be studied in a __________ reactor.
[A].

batch

[B].

plug-flow

[C].

mixed

[D].

none of these

Answer: Option C

Explanation:

No answer description available for this question.

Question: A chemical reaction, A 3B, is conducted in a constant pressure vessel. Starting with pure A, the volume of the reaction mixture increases 3 times in 6 minutes. The fractional conversion is
[A].

0.33

[B].

0.5

[C].

1

[D].

data insufficient, can’t be predicted

Answer: Option C

Explanation:

No answer description available for this question.

Question: Carbon particles accummulated on the catalyst used in the gas oil cracking lies in the category of __________ poison.
[A].

deposited

[B].

chemisorbed

[C].

selectivity

[D].

stability

Answer: Option A

Explanation:

No answer description available for this question.