Decreases
Increases
Remains constant
Becomes infinite
✅ The correct answer is option B.
Chemical Engineering MCQs
For any reaction, we may write conversion as a function of
Time
Temperature
Concentration
All of the above
✅ The correct answer is option D.
The equilibrium constant of a catalytic chemical reaction __________ due to the presence of a catalyst.
Increases
Decreases
Remains unaffected
Unpredictable from the data
✅ The correct answer is option C.
In a first order reaction, the time required to reduce the concentration of reactant from 1 mole/litre to 0.5 mole/litre will be __________ that required to reduce it from 10 moles/litre to 5 moles/litre in the same volume.
More than
Less than
Same as
Data insufficient; can’t be predicted
✅ The correct answer is option C.
If ΔG (free energy change) for a chemical reaction is very large and negative, then the reaction is
Not feasible
Just feasible
Very much feasible
Unpredictable as ΔG is no measure of feasibility of a reaction
✅ The correct answer is option C.
Semibatch reactor is preferred, when a/an
A highly exothermic reaction is to be controlled
Undersirable side reaction (at high concentration of one of the reactants) is to be avoided
A gas is to be reacted with liquid (e.g. hydrogenation of fat)
All of the above
✅ The correct answer is option D.
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.
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.
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.