Chemical Reaction Engineering MCQ

Test your knowledge with important Chemical Reaction Engineering MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more Chemical Reaction Engineering MCQs at Bissoy

• In a/an __________ reactor, there is exchange of heat with the surroundings with sizeable temperature variation.
  ক

  Adiabatic

  খ

  Isothermal

  গ

  Non-adiabatic

  ঘ

  None of these
• Integral method for analysing the kinetic data is used
  ক

  When the data are scattered

  খ

  For testing specific mechanisms with simple rate expressions

  গ

  Both A and B

  ঘ

  None of these
• Differential method for analysing the kinetic data is used
  ক

  For testing complicated mechanisms

  খ

  When the data are scattered

  গ

  When rate expressions are very simple

  ঘ

  None of these
• The units of frequency factor in Arhenious equation
  ক

  Are the same as those of the rate constant

  খ

  Depend on the order of the reaction

  গ

  Depend on temperature, pressure etc. of the reaction

  ঘ

  Are cycles per unit time
• In case of a/an __________ chemical reaction, conversion increases with the rise in temperature.
  ক

  Reversible exothermic

  খ

  Irreversible exothermic

  গ

  Irreversible endothermic

  ঘ

  Reversible endothermic
• The reactions with low activation energy are
  ক

  Always spantaneous

  খ

  Slow

  গ

  Fast

  ঘ

  Non-spontaneous
• The conversion X_A and residence time data are collected for zero order liquid phase reaction in a stirred tank reactor. Which of the following will be a straight line?
  ক

  X_A Vs τ

  খ

  X_A Vs ln τ

  গ

  $$\frac{{{{\text{X}}_{\text{A}}}}}{{1 - {{\text{X}}_{\text{A}}}}}$$  Vs τ

  ঘ

  X_A(1 - X_A) Vs τ
• The 'E' curve for a non-ideal reactor defines the fraction of fluid having age between t and t + dt
  ক

  At the inlet

  খ

  At the outlet

  গ

  In the reactor

  ঘ

  Averaged over the inlet and outlet
• Which of the following fixes the volume of a batch reactor for a particular conversion and production rate?
  ক

  Operating conditions (e.g. pressure and temperature)

  খ

  Rate constant

  গ

  Density of mixture

  ঘ

  None of these
• The rate of the chemical reaction A → B doubles as the concentration of A i.e., C_A is doubled. If rate of reaction is proportional to C_Aⁿ, then what is the value of n for this reaction?
  ক

  0.5

  খ

  1

  গ

  0

  ঘ

  2
• For high conversion in a highly exothermic solid catalysed reaction, use a __________ bed reactor.
  ক

  Fixed

  খ

  Fluidised bed reactor followed by a fixed

  গ

  Fixed bed reactor followed by a fluidised

  ঘ

  Fluidised
• Sometimes, batch process is preferred over continuous process, when the product
  ক

  Quality & yield can not be achieved in continuous processes, because of long residence time

  খ

  Sales demand is fluctuating

  গ

  Both A & B

  ঘ

  Neither A nor B
• The dispersion number of perfect mixed flow is
  ক

  0

  খ

  > 150

  গ

  ∞
• Which of the following is not a chemical step in a fluid solid catalytic reaction?
  ক

  Surface chemical reaction

  খ

  Adsorption

  গ

  Desorption

  ঘ

  None of these
• The rate of the reaction, X → Y, quadruples when the concentration of 'X' is doubled. The rate expression for the reaction is, r = K C_xⁿ, the value of 'n' in this case will be
  ক

  0

  খ

  1

  গ

  2

  ঘ

  3
• Kinetics of a solid catalysed reaction can best be studied in a __________ reactor.
  ক

  Batch

  খ

  Plug-flow

  গ

  Mixed

  ঘ

  None of these
• Rate of a chemical reaction is independent of the concentration of the reactants for a __________ reaction.
  ক

  Zero order

  খ

  Third order

  গ

  Consecutive

  ঘ

  None of these
• For identical flow rate, feed composition and for elementary first order reactions, 'N' equal sized mixed reactors in series with a total volume 'V' gives the same conversion as a single plug flow reactor of volume 'V' for constant density systems. This is true, when the value of 'N' is
  ক

  1

  খ

  >1

  গ

  ∞

  ঘ

  ≥1
• The performance of a cascade of CSTR's can be improved by adding
  ক

  A P.F. reactor in series

  খ

  A P.F. reactor in parallel

  গ

  More CSTR's in series

  ঘ

  More CSTR's in parallel
• An example of autothermal reactor operation is
  ক

  Sulphur dioxide oxidation

  খ

  Ethylene oxidation

  গ

  Benzene oxidation

  ঘ

  Ammonia synthesis
• In which of the following reactions the equilibrium will shift to the right, if the total pressure is increased?
  ক

  H₂ + C$${l_2}$$ ⇋ 2HC$$l$$

  খ

  N₂ + O₂ ⇋ 2NO

  গ

  N₂O₄ ⇋ 2NO₂

  ঘ

  H₂ + $${I_2}$$ ⇋ 2H$$I$$
• For a first order chemical reaction in a porous catalyst, the Thiele modulus is 10. The effectiveness factor is approximately equal to
  ক

  1

  খ

  0.5

  গ

  0.1

  ঘ

  0
• The ratio of moles of a reactant converted into the desired product to that converted into unwanted product is called
  ক

  Operational yield

  খ

  Relative yield

  গ

  Selectivity

  ঘ

  None of these
• Promoter is added to the catalyst to improve its
  ক

  Porosity

  খ

  Sensitivity

  গ

  Surface area

  ঘ

  None of these
• When a high liquid hold up is required in a reactor for gas liquid reaction, use __________ coloumn.
  ক

  Packed

  খ

  Spray

  গ

  Tray

  ঘ

  Bubble
• For an ideal gas mixture undergoing a reversible gaseous phase chemical reaction, the equilibrium constant
  ক

  Is independent of pressure

  খ

  Increases with pressure

  গ

  Decreases with pressure

  ঘ

  Increases /decreases with pressure depending on the stoichiometric co-efficients of the reaction
• When an exothermic reversible reaction is conducted adiabatically, the rate of reaction
  ক

  Continuously increases

  খ

  Continuously decreases

  গ

  Passes through a maximum

  ঘ

  Passes through a minimum
• If the time required to complete a definite fraction of reaction varies inversely as the concentration of the reactants, then the order of reaction is
  ক

  0

  খ

  1

  গ

  2

  ঘ

  3
• __________ gas is normally employed in B.E.T. method of finding out the surface area of catalyst.
  ক

  N₂

  খ

  H₂

  গ

  CO₂

  ঘ

  He
• For an autocatalytic reactor, the suitable reactor set up is
  ক

  P.F. reactors in series

  খ

  CSTR in series

  গ

  CSTR followed by P.F. reactor

  ঘ

  P.F. reactor followed by CSTR