Chemical Reaction Engineering MCQ Quiz Questions & Answer PDF Download

Chemical Reaction Engineering MCQ | Chemical Reaction Engineering Multiple Choice Questions & Answer | Chemical Reaction Engineering MCQ PDF

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Chemical Reaction Engineering MCQ

1. According to the ‘law of mass action’, the rate of reaction is directly proportional to the__________________

  1. Nature of the reactants
  2. Volume of the reaction vessel
  3. Equilibrium constant
  4. Molar concentration of the reactants

Answer: Molar concentration of the reactants

2. Catalyst is a substance, which __________ chemical reaction.

  1. Decreases the speed of a
  2. Increases the speed of a
  3. Can either increase or decrease the speed of a
  4. Alters the value of equilibrium constant in a reversible

Answer: Increases the speed of a

3. What is the dispersion number for a CSTR?

  1. 1
  2. 0
  3. < 1
  4. ∞

Answer: ∞

4. For an ideal mixed flow reactor (CSTR), the exit age distribution E(t) is given by_______________

  1. A step function
  2. A dirac delta function
  3. A ramp function
  4. None

Answer: None

5. Higher free energy of activation of a chemical reaction (at a given temperature) implies____________

  1. Higher rate of reaction
  2. Higher equilibrium conversion
  3. Slower rate of reaction
  4. All of above

Answer: Slower rate of reaction

6. The eddy diffusivity for a liquid in plug flow must be_______________

  1. 0
  2. ∞
  3. Between 0 and 1
  4. 1

Answer: 0

7. Mean residence time is equal to the space time, when___________

  1. The temperature, pressure and the density of reaction mixture remains constant throughout the reactor
  2. The feed rate is measured at temperature and pressure in the reactor
  3. There is no change in number of moles in gaseous reaction
  4. All of the above

Answer: All of the above

8. If the rate of a chemical reaction becomes slower at a given temperature, then the______________-

  1. Free energy of activation is lower
  2. Entropy changes
  3. Initial concentration of the reactants remains constant
  4. Free energy of activation is higher

Answer: Free energy of activation is higher

9. A space time of 3 hours for a flow reactor means that_____________

  1. Three reactor volumes of feed can be processed every hour
  2. The time required to process one reactor volume of feed (measured at specified conditions) is 3 hours
  3. Conversion is cent per cent after three hours
  4. It takes three hours to dump the entire volume of the reactor with feed

Answer: The time required to process one reactor volume of feed (measured at specified conditions) is 3 hours

10. The most suitable reactor for carrying out an auto-thermal reaction is a_____________

  1. CSTR
  2. Semi-batch reactor
  3. Batch reactor
  4. Plug-flow reactor

Answer: CSTR

11. The equilibrium constant of chemical reaction __________ in the presence of catalyst.

  1. Decreases
  2. Increases
  3. Remains unaffected
  4. Can either increase or decrease

Answer: Remains unaffected

12. Which of the following will give maximum gas conversion?

  1. Semi-fluidised bed reactor
  2. Fluidised bed reactor
  3. Plug-flow catalytic reactor
  4. Fixed bed reactor

Answer: Semi-fluidised bed reactor

13. In an ideal tubular-flow reactor_________________

  1. Mixing takes place in radial direction
  2. There is a uniform velocity across the radius
  3. There is no mixing in longitudinal direction
  4. All of the above

Answer: All of the above

14. Recycling back of outlet stream to the reactor from an ideal CSTR carrying out a first order liquid phase reaction will result in __________ in conversion.

  1. Increase
  2. No change
  3. Decrease
  4. None

Answer: No change

15. For the same residence time, which one will give the maximum conversion?

  1. Two stirred tank (each of 2.5 litres) in series
  2. Stirred tank followed by tubular flow reactor (each of 2.5 litres)
  3. Single stirred tank (v = 5 litres)
  4. Single tubular flow reactor (v = 5 litres)

Answer: Single tubular flow reactor (v = 5 litres)

16. A reactor is generally termed as an autoclave, when it is a____________

  1. Atmospheric pressure CSTR
  2. Atmospheric pressure tank reactor
  3. High pressure batch reactor
  4. High pressure tubular reactor

Answer: High pressure batch reactor

17. The conversion of a reactant, undergoing a first order reaction, at a time equal to three times the half life of the reaction is___________

  1. 0.5
  2. 0.875
  3. 0.425
  4. Data insufficient to calculate

Answer: 0.875

18. A batch reactor is suitable for_____________

  1. Large scale gaseous phase reactions
  2. Achieving cent percent conversion of reactants into products
  3. Liquid phase reactions
  4. Obtaining uniform polymerisation products in highly exothermic reaction

Answer: Liquid phase reactions

19. In case of calcination of limestone, CaCO3 CaO + CO2, the addition of more of CaO will result in __________ in the concentration of CO2.

  1. Increase
  2. No change
  3. Unpredictable from the data
  4. Decrease

Answer: No change

20. A typical example of an exothermic reversible reaction conducted at high pressure in industry is_______________

  1. Methanol synthesis
  2. Reformation of methane
  3. Dehydration of ethanol
  4. Polymerisation of ethylene

Answer: Dehydration of ethanol

21. If Thiele modulus is __________ , then the pore diffusion resistance in a catalyst may be considered as negligible.

  1. ∞
  2. 0
  3. < 0.5
  4. > 0.5

Answer: < 0.5

22. Threshold energy in a reaction is equal to the________________

  1. Normal energy of reactants
  2. Activation energy
  3. Sum of 1 & 2
  4. None of above

Answer: Sum of 1 & 1

23. Which of the following chemical reactions will be favoured by low pressure?

  1. N2O2 ⇋ 2NO2
  2. N2 + O2 ⇋ 2NO
  3. 2HI ⇋ H2 + I2
  4. None

Answer: N2O2 ⇋ 2NO2

24. The time needed to achieve the same fractional conversion for particles of different sizes (d) when chemical reaction controls, is proportional to__________

  1. d−−√
  2. d
  3. d2
  4. d1.5

Answer: d

25. 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

  1. 1.33
  2. 1.60
  3. 0.80
  4. 2.67

Answer: 1.60

26. A trickle bed reactor is the one, which____________

  1. Processes three reactants at different flow rates
  2. Has altogether three streams either entering or leaving
  3. Processes three reactants with same flow rate
  4. Employs all the three phases (i.e.. .solid, liquid and gas)

Answer: Employs all the three phases (i.e.. .solid, liquid and gas)

27. In an exothermic chemical reaction, the reactants compared to the products have_______________-

  1. More energy
  2. Less energy
  3. Higher temperature
  4. Same energy

Answer: More energy

28. Limiting reactant in a chemical reaction decides the_____________

  1. Conversion
  2. Rate constant
  3. Equilibrium constant
  4. Reaction speed

Answer: Conversion

29. Study of chemical kinetics is the easiest in the case of __________ reactions.

  1. Surface
  2. Reversible
  3. Irreversible
  4. Side

Answer: Irreversible

30. The catalyst in a first order chemical reaction changes the_____________

  2. Equilibrium constant
  3. Heat of formation of the product
  4. Heat of reaction

Answer: Activation energy

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Chemical Reaction Engineering MCQ Quiz PDF