Chemical Reaction Engineering

Question: For nearly isothermal operation involving large reaction time in a liquid-phase reaction, the most suitable reactor is a __________ reactor.
[A].

stirred tank

[B].

tubular flow

[C].

batch

[D].

fixed bed

Answer: Option A

Explanation:

No answer description available for this question.

Question: A batch reactor is
[A].

suitable for gas-phase reactions on commercial scale.

[B].

suitable for liquid phase reactions involving small production rate.

[C].

least expensive to operate for a given rate.

[D].

most suitable for very large production rate.

Answer: Option B

Explanation:

No answer description available for this question.

Question: Fluidised bed reactor is characterised by
[A].

uniformity of temperature.

[B].

comparatively smaller equipment.

[C].

very small pressure drop.

[D].

absence of continuous catalyst regeneration facility.

Answer: Option A

Explanation:

No answer description available for this question.

Question: A space time of 3 hours for a flow reactor means that
[A].

the time required to process one reactor volume of feed (measured at specified conditions) is 3 hours.

[B].

three reactor volumes of feed can be processed every hour.

[C].

it takes three hours to dump the entire volume of the reactor with feed.

[D].

conversion is cent per cent after three hours.

Answer: Option A

Explanation:

No answer description available for this question.

Question: A high space velocity means that a given
[A].

reaction can be accomplished with small reactor.

[B].

conversion can be obtained with a high feed rate.

[C].

both (a) and (b).

[D].

none of these.

Answer: Option C

Explanation:

No answer description available for this question.

Question: In an ideal tubular-flow reactor
[A].

there is no mixing in longitudinal direction.

[B].

mixing takes place in radial direction.

[C].

there is a uniform velocity across the radius.

[D].

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

Answer: Option D

Explanation:

No answer description available for this question.

Question: A backmix reactor
[A].

is same as plug-flow reactor.

[B].

is same as ideal stirred tank reactor.

[C].

employs mixing in axial direction only.

[D].

is most suitable for gas phase reaction.

Answer: Option B

Explanation:

No answer description available for this question.

Question: In a semi-batch reactor
[A].

velocity of reaction can be controlled.

[B].

maximum conversion can be controlled.

[C].

both the reactants flow counter-currently.

[D].

residence time is constant.

Answer: Option A

Explanation:

No answer description available for this question.

Question: A plug-flow reactor is characterised by
[A].

high capacity.

[B].

presence of axial mixing.

[C].

presence of lateral mixing.

[D].

constant composition and temperature of reaction mixture.

Answer: Option C

Explanation:

No answer description available for this question.

Question: A batch reactor is characterised by
[A].

constant residence time.

[B].

variation in extent of reaction and properties of the reaction mixture with time.

[C].

variation in reactor volume.

[D].

very low conversion.

Answer: Option B

Explanation:

No answer description available for this question.