Essentials of Chemical Reaction Engineering Questions - Set 29 - ObjectiveBooks

Essentials of Chemical Reaction Engineering Questions - Set 29

Practice Test: Question Set - 29

1. The equilibrium constant for the reversible reaction as shown in the bellow figure, is affected by the
    (A) Temperature of the system
    (B) Presence or absence of inerts
    (C) Pressure of the system
    (D) Kinetics of the reaction

2. For reactions in parallel viz A → P (desired product) and A → Q (unwanted product), if the order of the desired reaction is higher than that of the undesired reaction, a
    (A) Batch reactor is preferred over a single CSTR for high yield
    (B) Tubular reactor is preferred over a single CSTR for high yield
    (C) Both (a) and (b)
    (D) Single CSTR is the most suitable

3. When the reaction is dominated by intraparticle diffusion, the apparent order of reaction (nD) as measured is related to the true order (n) as
    (A) nD = (n + 1)/2
    (B) nD = n/2
    (C) nD = n + 1
    (D) None of these

4. A first order reaction requires two unequal sized CSTR. Which of the following gives higher yield?
    (A) Large reactor followed by smaller one
    (B) Smaller reactor followed by larger one
    (C) Either of the arrangement (a) or (b) will give the same yield
    (D) Data insufficient, can't be predicted

5. According to Arrhenius equation of temperature dependency of rate constant for an elementary reaction
    (A) k  √T
    (B) k  e-E/RT
    (C) k  T e-E/RT
    (D) None of these

6. The rate of a chemical reaction is almost doubled for every 10°C rise in temperature. The rate will increase __________ times, if the temperature rises from 10 to 100°C.
    (A) 256
    (B) 512
    (C) 112
    (D) 612

7. The performance of a cascade of CSTR's can be improved by adding
    (A) A P.F. reactor in series
    (B) A P.F. reactor in parallel
    (C) More CSTR's in series
    (D) More CSTR's in parallel

8. For the liquid phase zero order irreversible reaction A → B, the conversion of A in a CSTR is found to be 0.3 at a space velocity of 0.1min-1. What will be the conversion for a PFR with a space velocity of 0.2 min-1? Assume that all the other operating conditions are the same for CSTR and PFR.
    (A) 0.15
    (B) 0.30
    (C) 0.60
    (D) 0.90

9. Pick out the wrong statement.
    (A) In a multistep reaction, the slowest step is the rate determining step
    (B) In general, the rate of a reaction becomes triple for every 10°C rise in temperature
    (C) Slow chemical reactions have generally high values of activation energy
    (D) Molecularity of a reaction cannot be zero but the order of a reaction can be zero

10. When the density of the reaction mixture is constant in a chemical reaction, the ratio of the mean residence time to space time is
    (A) > 1
    (B) < 1
    (C) 1
    (D) 0

11. An isothermal aqueous phase reversible reaction, P  R, is to be carried out in a mixed flow reactor. The reaction rate in k.mole/m3 .h is given by, r = 0.5CP - 0.125CR. A stream containing only P enters the reactor. The residence time required (in hours) for 40% conversion of P is
    (A) 0.80
    (B) 1.33
    (C) 1.60
    (D) 2.67

12. A reaction in which one of the products of reaction acts as a catalyst is called a/an __________ reaction.
    (A) Catalytic
    (B) Autocatalytic
    (C) Photochemical
    (D) None of these

13. Which of the following chemical reactions will be favored by low pressure?
    (A) 2HI  H2 + I2
    (B) N2O2  2NO2
    (C) N2 + O2  2NO
    (D) None of these

14. Pick out the wrong statement.
    (A) In a batch reactor, which is exclusively used for liquid phase reactions; temperature pressure and composition may vary with time
    (B) In a semi-batch reactor, one reactant is charged batchwise, while the other reactant is fed continuously
    (C) In a continuous flow reactor, uniform concentration cannot be maintained throughout the vessel even in a well agitated system
    (D) In a continuous flow reactor, both the reactants and the products flow out continuously

15. Enzymes (a protein) are catalysts found in organisms. Its efficiency of catalyzing a reaction is due to its capacity to lower the activation energy of the reaction. The enzyme ptyalin used for food digestion is present in
    (A) Blood
    (B) Saliva
    (C) Intestine
    (D) Gland

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