Chemical Reaction Engineering Interview Questions - Set 11 - ObjectiveBooks

Chemical Reaction Engineering Interview Questions - Set 11

Practice Test: Question Set - 11

1. The irreversible reaction, X → Y, is the special case of the reversible reaction, X  Y, in which the
    (A) Equilibrium constant is infinite
    (B) Fractional conversion of 'A' at equilibrium is unity
    (C) Concentration of 'A' at equilibrium is zero
    (D) All (a), (b) and (c)

2. The catalyst in a first order chemical reaction changes the
    (A) Equilibrium constant
    (B) Activation energy
    (C) Heat of formation of the product
    (D) Heat of reaction

3. Pick out the correct statement.
    (A) A chemical reaction accompanied by absorption of heat is called an exothermic reaction
    (B) A chemical reaction accompanied by evolution of heat is called an endothermic reaction
    (C) The rate constant for a first order reaction does not change on changing the concentration units
    (D) Chemical equilibrium state is dynamic in nature

4. In chamber process of sulphuric acid manufacture in industry, the gas phase oxidation of SO2 to SO3 is accomplished by a __________ reaction.
    (A) Non-catalytic homogeneous
    (B) Non-catalytic heterogeneous
    (C) Catalytic homogenous
    (D) Catalytic heterogeneous

5. For identical flow rate and feed composition, X plug flow reactors (PER) in series with a total volume V gives the same conversion as single
    (A) CSTR of volume V
    (B) PFR of volume V
    (C) CSTR of volume V/X
    (D) PFR of volume V/X

6. For a tubular flow reactor with uniform concentration and temperature, the independent variable is
    (A) Time
    (B) Length
    (C) Diameter
    (D) None of these

7. In case of unimolecular type elementary reaction as shown in the bellow figure, plug flow reactor as compared to mixed reactor is:
    (A) More
    (B) Same
    (C) Less
    (D) Unpredictable

8. Differential method for analyzing the kinetic data is used
    (A) For testing complicated mechanisms
    (B) When the data are scattered
    (C) When rate expressions are very simple
    (D) None of these

9. Fractional conversion __________ for an exothermic reversible chemical reaction, when the temperature is maximum.
    (A) Increases
    (B) Remains unchanged
    (C) Decreases
    (D) Unpredictable from the data

10. Which of the following is not endothermic in nature?
    (A) Combustion of sulphur
    (B) Gasification of carbon
    (C) Thermal cracking of fuel oil
    (D) Steam reforming of naphtha

11. Overall rate of reaction in a heterogeneous catalytic reaction depends upon the mass and energy transfer from the fluid to solid surface and its rate of reaction is usually __________ the concentration of catalyst, if it does not entail a chain mechanism.
    (A) Proportional to
    (B) Independent of
    (C) Inversely proportional to
    (D) Proportional to the square of

12. The reaction in which one of the products of reaction acts as a catalyst is called a/an __________ reaction.
    (A) Biochemical
    (B) Photochemical
    (C) Catalytic
    (D) Autocatalytic

13. The use of space time is preferred over the mean residence time in the design of a/an
    (A) Batch reactor
    (B) Ideal tubular-flow reactor
    (C) Slurry reactor
    (D) CSTR

14. Oil is hydrogenated using nickel catalyst in a __________ reactor.
    (A) Batch
    (B) Slurry
    (C) Fluidized bed
    (D) Fixed bed

15. A first order reaction A → B occurs in an isothermal porous catalyst pellet of spherical shape. If the concentration of A at the center of the pellet is much less than at the external surface, the process is limited by
    (A) Diffusion within the pellet
    (B) Reaction
    (C) External mass transfer
    (D) None of the above

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