181. A high space velocity means that a given
Reaction can be accomplished with small reactor
Conversion can be obtained with a high feed rate
Both A and B
None of these
✅ The correct answer is option C.
Chemical Reaction Engineering MCQs
182. For the liquid phase parallel reactions: R, rR = K?.CA2; E? = 80 KJ/mole S, rS = K?.CA ; E? = 120 KJ/mole The desired product is R. A higher selectivity of R will be achieved, if the reaction is conducted at
Low temperature in a CSTR
High temperature in a CSTR
Low temperature in a PFR
High temperature in a PFR
✅ The correct answer is option D.
183. Most important characteristics of gas-liquid reactors are the
Specific inter-facial area
Liquid hold-up
Both A and B
None of these
✅ The correct answer is option C.
184. The performance of a cascade of CSTR’s can be improved by adding
A P.F. reactor in series
A P.F. reactor in parallel
More CSTR’s in series
More CSTR’s in parallel
✅ The correct answer is option C.
185. In a/an __________ vessel, the fluid enters and leaves following plug flow.
Open
Closed
Open-closed
Close-opened
✅ The correct answer is option B.
186. Which of the following factors control the deactivation of a porous catalyst pellet?
Decay reactions
Pore diffusion
Form of surface attack by poison
All of the above
✅ The correct answer is option D.
187. A first order irreversible reaction, A → B is carried out separately in a constant volume as well as in a variable volume reactor for a particular period. It signifies that __________ in the two reactors.
Both conversion as well as concentration are same
Conversion in both will be the same but concentrations will be different
Both the conversion as well as concentrations will be different
None of these
✅ The correct answer is option B.
188. For the gaseous reaction 2A → B, where the feed consists of 50 mole % A and 50 mole % inerts, the expansion factor is
1
-0.5
-0.25
0
✅ The correct answer is option C.
189. The synthesis of proteins and metabolism in biological objects occur in the presence of biocatalyst called
A ferment or an enzyme
Haemoglobin
Fungi
None of these
✅ The correct answer is option C.
190. Which of the following is a characteristic of an ideal plug flow reactor?
Axial dispersion
Flat velocity profile
Uniform mixing
None of these
✅ The correct answer is option B.