Chemical Reaction Engineering Notes Multiple Choice Questions - Set 09 - ObjectiveBooks

Chemical Reaction Engineering Notes Multiple Choice Questions - Set 09

Practice Test: Question Set - 09

1. Pick out the wrong statement.
    (A) For the same conversion, the holding time required in a batch reactor, is always equal to the space time required in a PFR
    (B) Two mixed reactors of unequal size are available for producing a specified product, formed by a homogenous second order reaction. To achieve maximum production rate, the smaller reactor should be placed in series before the larger reactor
    (C) Arrhenius equation describing the effect of temperature on rate constant is given by, K = A.e-Ea/RT
    (D) The mechanism for the decomposition of CH3CHO into CH4 and CO in presence of I2 is:
    CH3CHO + I2 → CH3I + HI + CO; slow
    CH3I + HI → CH4 + I2; fast
    Then the rate of disappearance of CH3CHO is equal to K.CCH3I.CHI and acts as a catalyst

2. The enzyme which can catalyze the conversion of glucose to ethyl alcohol is
    (A) Invertase
    (B) Maltase
    (C) Diastase
    (D) Zymase

3. For a homogeneous reaction of nth order, the dimension of the rate constant is given by
    (A) 1/(time)n
    (B) (Concentration)1 - n/(time)
    (C) (Concentration)n - 1/(time)
    (D) None of these

4. In a CSTR __________ varies with time.
    (A) Reaction rate
    (B) Concentration
    (C) Both (a) & (b)
    (D) Neither (a) nor (b)

5. A catalyst promoter
    (A) Improves the activity of a catalyst
    (B) Acts as a catalyst support
    (C) Itself has very high activity
    (D) All (a), (b) and (c)

6. The rate of a gas phase reaction is given by K . CA . CB. If the volume of the reaction vessel is reduced to l/4th of its initial volume, then the reaction rate compared to the original rate will be __________ times.
    (A) 4
    (B) 16
    (C) 8
    (D) 2

7. The vessel dispersion number (D/μL) for plug flow is
    (A) 0
    (B) 500
    (C) 750

8. A plug-flow reactor is characterized by
    (A) High capacity
    (B) Presence of axial mixing
    (C) Presence of lateral mixing
    (D) Constant composition and temperature of reaction mixture

9. The rate constant of a reaction is a function of the
    (A) Time of reaction
    (B) Temperature of the system
    (C) Extent of reaction
    (D) Initial concentration of the reactants

10. In which of the following reactions, the equilibrium will shift to the right, if the total pressure is increased?
    (A) H2 + Cl2  2HCl
    (B) N2 + O2  2NO
    (C) N2O4  2 NO2
    (D) H2 + I2  2HI

11. Cold shot cooling is only practical when the feed temperature is __________ than the reaction temperature.
    (A) Higher
    (B) Much higher
    (C) Lower
    (D) Much lower

12. A chemical reaction, A → 3B, is conducted in a constant pressure vessel. Starting with pure A, the volume of the reaction mixture increases 3 times in 6 minutes. The fractional conversion is
    (A) 0.33
    (B) 0.5
    (C) 1
    (D) Data insufficient, can't be predicted

13. Autocatalytic reactions are best carried out in a
    (A) CSTR
    (B) CSTR in series
    (C) Plug flow reactor
    (D) Recycle reactor

14. In the fluid catalytic cracker (FCC), the cracking reaction is __________ (i) and the regeneration is__________ (ii) __________
    (A) (i) exothermic (ii) endothermic
    (B) (i) exothermic (ii) exothermic
    (C) (i) endothermic (ii) endothermic
    (D) (i) endothermic (ii) exothermic

15. Bulk diffusion in catalyst pore __________ with increase in pressure.
    (A) Increases
    (B) Decreases
    (C) Remains unchanged
    (D) Increases exponentially

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