Chemical Reaction Engineering Objective Questions ans Answers - Set 01

Practice Test: Question Set - 01

1. In case of staged packed bed reactors carrying out exothermic reaction, use
    (A) High recycle for pure gas
    (B) Plug flow for dilute liquid requiring no large preheating of feed
    (C) Cold shot operations for a dilute solution requiring large preheating to bring the stream upto the reaction temperature
    (D) All (a), (b) and (c)

2. The performance equations for constant density systems are identical for
    (A) P.F.R. and backmix reactor
    (B) P.F.R. and batch reactor
    (C) P.F.R. batch reactor and backmix reactor
    (D) Batch reactor and backmix reactor

3. The equilibrium constant of chemical reaction __________ in the presence of catalyst.
    (A) Increases
    (B) Decreases
    (C) Remain unaffected
    (D) Can either increase or decrease (depends on the type of catalyst)

4. Study of chemical kinetics is the easiest in the case of __________ reactions.
    (A) Irreversible
    (B) Reversible
    (C) Surface
    (D) Side

5. With increase in temperature, the equilibrium conversion of a reversible exothermic reaction
    (A) Decreases
    (B) Increases
    (C) Remain unaffected
    (D) Decreases linearly with temperature

6. The point selectivity of the product 'Y' in the reaction as shown in the bellow figure, is equal to
Practice Set 01 - Question No. 06
    (A) K1/K2
    (B) K2/K1
    (C) K1 - K2
    (D) K2 - K1

7. For reaction, P + 2 → 3R, molar rate of consumption of P is
    (A) Double of that of Q
    (B) Same as that of Q
    (C) Half of that of Q
    (D) 2/3rd of that of Q

8. Pick out the wrong statement.
    (A) Visible radiation provides the necessary activation energy in photochemical reactions
    (B) The order and molecularity of a complex reaction may not be the same
    (C) For a second order reaction, the slope of the graph/plot between rate and (concentration) is equal to the rate constant (k)
    (D) Molecularity of the reaction is always a whole number greater than zero

9. In a first order reaction, the time required to reduce the concentration of reactant from 1 mole/liter to 0.5 mole/liter will be __________ that required to reduce it from 10 moles/liter to 5 moles/liter in the same volume.
    (A) More than
    (B) Less than
    (C) Same as
    (D) Data insufficient; can't be predicted

10. An irreversible first order reaction is being carried out in a CSTR and PFR of same volume. The liquid flow rates are same. The relative conversion will
    (A) Be more in CSTR than in PFR
    (B) Be more in PFR than in CSTR
    (C) Be same in both cases
    (D) Depend on the temperature

11. The first order series reaction as shown in the bellow figure is conducted in a batch reactor. The initial concentrations of A, B and C (CA0CB0CC0 respectively) are all non-zero. The variation of CB with reaction time will not show a maximum, if
Practice Set 01 - Question No. 11
    (A) k2 CB0 > k1 CA0
    (B) k CA0 > k2.CB0
    (C) CB0 > CA0
    (D) CA0 > CB0

12. Three plug flow reactors (PFR's) of 4, 5 & 6 m3 volumes are arranged in two branches as shown below in the figure.
Practice Set 01 - Question No. 12
If the total feed rate is 300 tons/hr, then for the same conversion in each branch, the feed rate through branch II should be __________ tons/hr.
    (A) 100
    (B) 150
    (C) 200
    (D) 225

13. Participation of __________ is involved in the occurrence of a chemical reaction.
    (A) Protons
    (B) Neutrons
    (C) Electrons
    (D) None of these

14. The first order gas phase reaction as shown in the bellow figure is conducted isothermally in batch mode. The rate of change of conversion with time is given by
Practice Set 01 - Question No. 14
    (A) dXA/dt = k1 (1 - XA)2 (1 + 2XA)
    (B) dXA/dt = k1 (1 - XA) (1 + 0.5XA)
    (C) dXA/dt = k1 (1 - XA)
    (D) dXA/dt = k1 (1 - XA)/(1 + XA)

15. A photochemical reaction is __________ light.
    (A) Initiated by
    (B) Accompanied with emission of
    (C) Catalysed by
    (D) Used to convert heat energy into

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