Overview of Chemical Reaction Engineering Short Questions - Set 08 - ObjectiveBooks

Overview of Chemical Reaction Engineering Short Questions - Set 08

Practice Test: Question Set - 08

1. Non-catalytic fluid-solid reactions are represented by __________ model.
    (A) Continuous reaction
    (B) Unreacted core
    (C) Both (a) and (b)
    (D) Neither (a) and (b)

2. Which of the following is the optimum operating condition for an exothermic reversible reaction taking place in a plug-flow reactor?
    (A) Temperature should be high in the beginning and decreased towards the end of the reaction
    (B) Very low temperature should be used throughout the reaction
    (C) Very high temperature should be used throughout the reaction
    (D) None of these

3. Which of the following holds good for an elementary reaction as shown in the bellow figure?
    (A) The rate of disappearance of 'Y' is equal to the rate of appearance of 'Z'
    (B) The rate of disappearance of 'Y' is equal to the rate of disappearance of 'X'
    (C) Three times the rate of disappearance of 'X' is equal to the rate of appearance of 'Z'
    (D) The rate of disappearance of 'X' is equal to the rate of appearance of 'Z'

4. To maximize the formation of R in the simultaneous reaction
    A + B → RrR = 2CA0.5.CB2 
    A + B→ SrS = 1.5 CACB
We should have
    (A) Low CA, low CB
    (B) Low CA, high CB
    (C) High CA, low CB
    (D) High CA, high CB

5. The exit age distribution of fluid leaving a vessel is used to know the
    (A) Activation energies of a reaction
    (B) Reaction mechanism
    (C) Extent of non-ideal flow in the vessel
    (D) None of these

6. The gas phase reaction 2A  B is carried out in an isothermal plug flow reactor. The feed consists of 80 mole % A and 20 mole % inerts. If the conversion of A at the reactor exit is 50%, then CA/CA0 at the outlet of the reactor is
    (A) 2/3
    (B) 5/8
    (C) 1/3
    (D) 3/8

7. Pick out the wrong statement.
    (A) For a first order consecutive reaction, a tubular flow reactor as compared to a stirred tank reactor provides higher overall selectivity
    (B) For an ideal mixed reactor at steady state, the exit stream has the same composition as fluid within the reactor and the space time is equivalent to holding time for constant density system
    (C) Plug flow reactor (PFR) is always smaller than mixed reactor for all positive reaction orders for a particular duty
    (D) Reaction rate does not decrease appreciably as the reaction proceeds in case of an autocatalytic reaction

8. The preferred reacting system for oxidation of oxylene to phthalic anhydride is
    (A) Jacketted liquid phase CSTR
    (B) Jacketted steam heated multitubular reactor
    (C) Multitubular reactor with cooling
    (D) Multistage multitubular reactor with interstage cooling

9. For a zero order reaction, the concentration of product increases with the
    (A) Increase of reaction time
    (B) Increase in initial concentration
    (C) Total pressure
    (D) Decrease in total pressure

10. The equilibrium constant ‘K’ of a chemical reaction depends on
    (A) Temperature only
    (B) Pressure only
    (C) Temperature and pressure
    (D) Ratio of reactants

11. The space time is equivalent to the holding time in a steady state mixed reactor for
    (A) Non-isothermal gas reaction
    (B) Variable fluid density systems
    (C) Constant fluid density systems
    (D) Gas reactions with changing number of moles

12. With increase in temperature, the rate constant obeying Arrhenius equation
    (A) Increases
    (B) Decreases
    (C) Decreases exponentially
    (D) Can either increase or decrease; depends on the frequency factor

13. The reaction A → B is conducted in an isothermal batch reactor. If the conversion of A increases linearly with holding time, then the order of the reaction is
    (A) 0
    (B) 1
    (C) 1.5
    (D) 2

14. The time needed to achieve the same fractional conversion for particles of different sizes (d) when chemical reaction controls, is proportional to
    (A) d
    (B) √d
    (C) d1.5
    (D) d2

15. The rate constant of a reaction depends on the
    (A) Initial concentration of reactants
    (B) Time of reaction
    (C) Temperature of the system
    (D) Extent of reaction

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