7721. Backmixing is most predominant in
A well stirred batch reactor
A plug-flow reactor
A single CSTR
CSTR’s connected in series
✅ The correct answer is option C.
Chemical Engineering
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7722. Specific rate constant for a second order reaction
Is independent of temperature
Varies with temperature
Depends on the nature of the reactants
Both B and C
✅ The correct answer is option D.
7723. Pure A in gas phase enters a reactor 50% of this A is converted to B through the reaction, A 3B. Mole fraction of A in the exit stream is
1-Feb
1-Mar
1-Apr
1-May
✅ The correct answer is option C.
7724. In a reaction, the threshold energy is equal to (where, A = activation energy N = normal energy of reactants)
A
N
A+N
A-N
✅ The correct answer is option C.
7725. A CSTR is to be designed in which an exothermic liquid phase first order reaction of the type, A → R, is taking place. The reactor is to be provided with a jacket in which coolant is flowing. Following data is given: CA0= 5 kmole/m³ ; XA = 0.5; Feed temperature = reactor temperature = 40°C. Rate constant at 40°C = 1 min⁻¹ ; (ΔH) = – 40kJ/mole; ρ = 1000kg/m³ CP = 4 J/gm.°C ; q = 10⁻³ m³/min (ρ and CP are same for the reactant and product streams). The amount of heat to be removed is
2/3 kW
1kW
5/3 kW
4kW
✅ The correct answer is option C.
7726. Molecularity of a reaction
Is always equal to the overall order of reaction
May not be equal to the order of reaction
Can
Both B and C
✅ The correct answer is option D.
7727. A batch reactor suffers from following disadvantage.
Poor product quality control
High labour and handling cost
High shutdown time requirement for emptying, cleaning and refilling
All of the above
✅ The correct answer is option D.
7728. 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.
7729. 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.
7730. 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.