Chemical Reaction Engineering Basics MCQ - Set 20 - ObjectiveBooks

Chemical Reaction Engineering Basics MCQ - Set 20

Practice Test: Question Set - 20

1. A catalyst is said to be a negative catalyst, if it
    (A) Retards the rate of reaction
    (B) Reduces the value of equilibrium constant
    (C) Does not initiate the reaction
    (D) All (a), (b) and (c)

2. For multiple reactions, the flow pattern within the vessel affects the
    (A) Size requirement
    (B) Distribution of reaction products
    (C) Both (a) and (b)
    (D) Neither (a) nor (b)

3. Pick out the wrong statement.
    (A) The vessel dispersion number (D/UL) for plug flow and mixed flow approaches zero and infinity respectively
    (B) Space time in a flow reactor is a measure of its capacity and is equal to the residence time when the density of reaction mixture is constant
    (C) Mixed reactor is always smaller than the plug flow reactor for all positive reaction orders for a particular duty
    (D) In an ideal tubular flow reactor, mixing takes place in radial direction and there is no mixing in longitudinal direction

4. The irreversible reaction is a special case of reversible reaction, if the
    (A) Equilibrium constant is 1
    (B) Conversion of the reactant at equilibrium condition is zero
    (C) Reactant concentration at equilibrium condition is zero
    (D) All (a), (b) and (c)

5. Rate of a chemical reaction is not influenced by the
    (A) Catalyst
    (B) Temperature
    (C) Reactants concentration
    (D) Number of molecules of reactants taking part in a reaction

6. If Thiele modulus is __________, then the pore diffusion resistance in a catalyst may be considered as negligible.
    (A) 0
    (C) < 0.5
    (D) > 0.5

7. __________ explains the mechanism of catalysis.
    (A) Activated complex theory
    (B) Collision theory
    (C) Thermodynamics
    (D) None of these

8. Which of the following factors control the design of a fluid-solid reactor?
    (A) Reaction kinetics for single particle
    (B) Size distribution of solids being treated
    (C) Flow patterns of solids and fluid in the reactor
    (D) All (a), (b) and (c)

9. For an autocatalytic reactor, the suitable reactor set up is
    (A) P.F. reactors in series
    (B) CSTR in series
    (C) CSTR followed by P.F. reactor
    (D) P.F. reactor followed by CSTR

10. Pick out the wrong statement.
    (A) Exit age description function (E) and internal age distribution function (I) are related as, E = -(dI/dθ)
    (B) Chmisorption studies are useful in the determination of catalyst surface area and pore size distribution
    (C) A higher temperature favors the reaction of higher activation energy
    (D) A catalyst increases the potential energy barrier over which the reactants must pass to form products

11. A reactor is generally termed as an autoclave, when it is a
    (A) High pressure batch reactor
    (B) Atmospheric pressure tank reactor
    (C) High pressure tubular reactor
    (D) Atmospheric pressure CSTR

12. If n = overall order of a chemical reaction. a = initial concentration of reactant. t = time required to complete a definite fraction of the reaction. Then pick out the correct relationship.
    (A) t  1/an
    (B) t  1/an - 1
    (C) t  1/an + 1
    (D) t  an

13. A CSTR is to be designed in which an exothermic liquid phase first order reaction of the type, A → R, is taking place. The reactor is to be provided with a jacket in which coolant is flowing. Following data is given: CA0= 5 kmole/m3XA = 0.5; Feed temperature = reactor temperature = 40°C. Rate constant at 40°C = 1 min-1; (ΔH) = - 40kJ/mole; ρ = 1000kg/m3 CP = 4 J/gm.°C ; q = 10-3 m3/min (ρ and CP are same for the reactant and product streams). The amount of heat to be removed is:
    (A) 2/3 kW
    (B) 1 kW
    (C) 5/3 kW
    (D) 4 kW

14. A space time of 3 hours for a flow reactor means that
    (A) The time required to process one reactor volume of feed (measured at specified conditions) is 3 hours
    (B) Three reactor volumes of feed can be processed every hour
    (C) It takes three hours to dump the entire volume of the reactor with feed
    (D) Conversion is cent per cent after three hours

15. For a reaction of the type of bellow given figure, the rate of reaction (- rx) is given by
    (A) (K1 + K1) CX
    (B) (K1 + K2+K3) CX
    (C) K1CV - K2CX
    (D) (K1 - K2) CX

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