Chemical Reaction Engineering 1 Marks Exam Paper - Set 16 - ObjectiveBooks

Chemical Reaction Engineering 1 Marks Exam Paper - Set 16

Practice Test: Question Set - 16

1. What is the order of chemical reaction as shown in the bellow figure, if it is found that the reaction rate doubles on doubling the concentration of B and also the reaction rate doubles when the concentrations of both A & B were doubled and quadrupled when the concentrations of both B & C were doubled?
    (A) 1
    (B) 2
    (C) 3
    (D) 4

2. Most important characteristics of gas-liquid reactors are the
    (A) Specific inter-facial area
    (B) Liquid hold-up
    (C) Both (a) and (b)
    (D) None of these

3. A liquid phase reaction is to be carried out under isothermal conditions. The reaction rate as a function of conversion has been determined experimentally and is shown in the figure given below. What choice of reactor or combination of reactors will require the minimum overall reactor volume, if a conversion of 0.9 is desired?

    (A) CSTR followed by a PFR
    (B) PFR followed by a CSTR
    (C) CSTR followed by a PFR followed by a CSTR
    (D) PFR followed by a CSTR followed by a PFR

4. The rate constant of a chemical reaction increases by 100 times when the temperature is increased from 400 °K to 500 °K. Assuming transition state theory is valid, the value of ‘E/R’ is
    (A) 8987°K
    (B) 9210°K
    (C) 8764°K
    (D) 8621°K

5. With an increase in pressure in gaseous phase chemical reactions, the fractional conversion __________ when the number of moles decreases.
    (A) Increases
    (B) Decreases
    (C) Remain unaffected
    (D) Unpredictable from the data

6. In a chemical reaction as shown in the bellow figure, it is observed that the
(i) Rate of formation of 'P' is doubled on doubling the concentration of 'X'
(ii) Rate of formation of 'P' is quadrupled on doubling the concentration of 'Y'
(iii) Doubling the concentration of 'Z' does not affect the rate of formation of 'P'

What is the order of the above chemical reaction?

    (A) Zeroth order
    (B) First order
    (C) Second order
    (D) Third order

7. For a first order chemical reaction in a porous catalyst, the Thiele modulus is 10. The effectiveness factor is approximately equal to
    (A) 0
    (B) 1
    (C) 0.1
    (D) 0.5

8. For the irreversible elementary reactions in parallel as shown in the bellow figure, the rate of disappearance of 'X' is equal to
    (A) CA (K1 + K2)
    (B) CA (K1 + K2)/2
    (C) CA . K1/2
    (D) CA . K2/2

9. The catalytic converter for conversion of SO2 to SO3 by contact process should have a feed with SO2 content between
    (A) 2-5 %
    (B) 7-10 %
    (C) 12-15 %
    (D) 20-25 %

10. According to the 'law of mass action', the rate of reaction is directly proportional to the
    (A) Equilibrium constant
    (B) Volume of the reaction vessel
    (C) Nature of the reactants
    (D) Molar concentration of the reactants

11. In a semi-batch reactor
    (A) Velocity of reaction can be controlled
    (B) Maximum conversion can be controlled
    (C) Both the reactants flow counter-currently
    (D) Residence time is constant

12. Pick out the correct statement.
    (A) In catalytic reactions, the catalyst reacts with the reactants
    (B) A catalyst initiates a chemical reaction
    (C) A catalyst lowers the activation energy of the reacting molecules
    (D) A catalyst cannot be recovered chemically unchanged at the end of the chemical reaction

13. Find a mechanism that is consistent with the rate equation and reaction given below:
     2A + B → A2B, ( - rA) = k.CA.CB
    (A) A + B  ABAB + A → A2B
    (B) A + B → AB; AB + A → A2B
    (C) A + A → AA; AA + B → A2B
    (D) A + A  AA; AA + B → A2B

14. A chemical reaction is of zero order, when the reaction rate is (where, CA = concentration of reactant).
    (A)  CA
    (B)  1/CA
    (C) Independent of temperature
    (D) None of these

15. Shift conversion reaction
    (A) Converts N2 and H2 into NH3
    (B) Converts CO to CO2 with steam
    (C) Is non-catalytic
    (D) Is highly exothermic

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