131. n’ number of plug flow reactors (P.F.R) in series with a total volume ‘V’ gives the same conversion as one P.F.R. of volume
V/n
V
V.n
1/V
✅ The correct answer is option B.
Chemical Reaction Engineering MCQs
132. When all the limiting reactant is consumed in the reaction, the operational yield __________ the relative yield.
Is greater than
Is smaller than
Equals
Can be either greater or smaller than (depends on the type of reaction)
✅ The correct answer is option C.
133. A backmix reactor
Is same as plug-flow reactor
Is same as ideal stirred tank reactor
Employs mixing in axial direction only
Is most suitable for gas phase reaction
✅ The correct answer is option B.
134. For every 10°C rise in temperature, the rate of chemical reaction doubles. When the temperature is increased from 30 to 70°C, the rate of reaction increases __________ times.
8
12
16
32
✅ The correct answer is option C.
135. On application of pressure to the equilibrium system, ice ⇋ water; which of the following phenomenon will occur?
Water will evaporate
Equilibrium will not be attained
More ice will be formed
More water will be formed
✅ The correct answer is option D.
136. For an autocatalytic reactor, the suitable reactor set up is
P.F. reactors in series
CSTR in series
CSTR followed by P.F. reactor
P.F. reactor followed by CSTR
✅ The correct answer is option C.
137. Autocatalytic reactions are best carried out in a
CSTR
CSTR in series
Plug flow reactor
Recycle reactor
✅ The correct answer is option D.
138. Pick the WRONG design guideline for a reactor in which the reactions, A → R (desired) and A → S (undesired) are to take place. The ratio of the reaction rates is rR/rS = (k₁/k₂).Csub>Aa-b
Use high pressure and eliminate inerts, when a > b
Avoid recycle, when a > b
Use batch reactor or plug flow reactor, when a > b
Use CSTR with a high conversion, when a > b
✅ The correct answer is option B.
139. The knowledge of initial concentration and rate constant is necessary to determine the half life time of a reaction of __________ order.
Zero
First
Second
None of these
✅ The correct answer is option C.
140. Effectiveness factor of a catalyst pellet is a measure of the __________ resistance.
Pore diffusion
Gas film
Chemical reaction
None of these
✅ The correct answer is option A.