Chemical Reaction Engineering Basics pdf Online Test - Set 04 - ObjectiveBooks

Chemical Reaction Engineering Basics pdf Online Test - Set 04

Practice Test: Question Set - 04


1. Effectiveness factor (E) of a catalyst pellet is defined as, E = (actual rate within pore of the catalyst)/(rate if not snowed by pore diffusion), Effectiveness factor for a first order reaction is given by (where, T = Thiele modulus)
    (A) tan hT/T
    (B) tan T/T
    (C) tan hT/tan T
    (D) None of these

2. B.E.T. method can be used to determine the __________ of a porous catalyst.
    (A) Solid density
    (B) Pore volume
    (C) Surface area
    (D) All (a), (b) and (c)

3. The exit age distribution of a fluid leaving a vessel (denoted by E) is used to study the extent of non-ideal flow in the vessel. The value of ∫0 E.dt is
    (A) 0
    (B) 1
    (C) 
    (D) √2π

4. On application of pressure to the equilibrium system, ice  water; which of the following phenomenon will occur?
    (A) Water will evaporate
    (B) Equilibrium will not be attained
    (C) More ice will be formed
    (D) More water will be formed

5. Molecularity of an elementary reaction, P + Q → R + S is
    (A) 1
    (B) 2
    (C) 3
    (D) 4

6. Rate of a chemical reaction is not affected by the
    (A) Catalyst
    (B) Temperature
    (C) Reactant’s concentration
    (D) Number of molecules of reactants taking part in the reaction

7. The 'E' curve for a non-ideal reactor defines the fraction of fluid having age between t and t + dt
    (A) At the inlet
    (B) At the outlet
    (C) In the reactor
    (D) Averaged over the inlet and outlet

8. Batch process is preferred over continuous process, when the
    (A) Product yields and quality cannot be achieved in continuous process, because of long residence time
    (B) Sales demand of product is not steady
    (C) Same equipment cannot be used for several processes of the same nature
    (D) All (a), (b) & (c)

9. For the reaction as shown in the bellow figure, the rate of formation of Z is 0.2 gm mole/litre.hr. What is the rate of disappearance of X in gm mole/litre.hr?
    (A) 0.4
    (B) 0.1
    (C) 0.2
    (D) None of these

10. For a first order isothermal chemical reaction in a porous catalyst, the effectiveness factor is 0.3. The effectiveness factor will increase if the
    (A) Catalyst size is reduced or the catalyst diffusivity is reduced
    (B) Catalyst size is reduced or the catalyst diffusivity is increased
    (C) Catalyst size is increased or the catalyst diffusivity is reduced
    (D) Catalyst size is increased or the catalyst diffusivity is increased

11. The conversion XA and residence time data are collected for zero order liquid phase reaction in a stirred tank reactor. Which of the following will be a straight line?
    (A) XA Vs . τ
    (B) XA Vs ln τ
    (C) XA/(1 - XA)Vs τ
    (D) XA(1 - XA)Vs τ

12. A second order liquid phase reaction, A → B, is carried out in a mixed flow reactor operated in semi batch mode (no exit stream). The reactant A at concentration CAF is fed to the reactor at a volumetric flow rate of F. The volume of the reacting mixture is V and the density of the liquid mixture is constant. The mass balance for A is
    (A) d(VCA)/dt = -F (CAF - CA) - kCA2V
    (B) d(VCA)/dt = F (CAF - CA) - kCA2V
    (C) d(VCA)/dt = -FCA - kCA2V
    (D) d(VCA)/dt = FCAF - kCA2V

13. Which of the following is not a dimension-less group used in catalysis? (Where, D = dispersion co-efficient, cm2/sec.D1 = diffusion co-efficient; cm2/sec L = length of the reactor, cm t = time, sec, v = volumetric flow rate, cm3/sec. V = volume, cm3.)
    (A) Reactor dispersion number (D/vL)
    (B) Reduced time (vt/V)
    (C) Thiele modulus L √(k/D1)
    (D) None of these

14. Following isothermal kinetic data are obtained in a basket type of mixed flow reactor for a porous catalyst. Determine the role of pore diffusion and external mass transfer processes.

    (A) Strong pore diffusion control and mass transfer not controlling
    (B) Both pore diffusion and mass transfer not controlling
    (C) Both pore diffusion and mass transfer controlling
    (D) Mass transfer controlling

15. Given, 
     3H2 + CO = CH4 + H2O, KP = 101.84 and, 
     4H2 + CO2 = CH4 + 2H2O, KP = 101.17
the KP for the reaction CO + H2O = CO2 + H2 is
    (A) 103.01
    (B) 10-0.67
    (C) 10-3.01
    (D) 100.67

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