কেমিক্যাল রিঅ্যাকশন ইঞ্জিনিয়ারিং

  • ০০। 'If the catalyst pore size is small in comparison with the mean free path, collisions with the pore wall controls the process'. The diffusivity under this condition is called 'Knudsen diffusivity', which is affected by the
    • ক) pressure
    • খ) temperature
    • গ) both (a) & (b)
    • ঘ) neither (a) nor (b)
  • ০১। 'n' number of plug flow reactors (P.F.R) in series with a total volume 'V' gives the same conversion as one P.F.R. of volume
    • ক) V/n
    • খ) V
    • গ) V.n
    • ঘ) 1/V
  • ০২। 'N' plug flow reactors in series with a total volume 'V' gives the same conversion as a single plug flow reactor of volume 'V' for __________ order reactions.
    • ক) first
    • খ) second
    • গ) third
    • ঘ) any
  • ০৩। 'Unreacted core model' represents the reaction involving
    • ক) combustion of coal particles.
    • খ) roasting of sulphide ores.
    • গ) manufacture of carbon disulphide from elements.
    • ঘ) none of these.
  • ০৪। 6 gm of carbon is burnt with an amount of air containing 18 gm oxygen. The product contains 16.5 gms CO2 and 2.8 gms CO besides other constituents. What is the degree of conversion on the basis of disappearance of limiting reactant ?
    • ক) 100%
    • খ) 95%
    • গ) 75%
    • ঘ) 20%
  • ০৫। A backmix reactor
    • ক) is same as plug-flow reactor.
    • খ) is same as ideal stirred tank reactor.
    • গ) employs mixing in axial direction only.
    • ঘ) is most suitable for gas phase reaction.
  • ০৬। A balanced chemical reaction equation conforms to the law of
    • ক) conservation of mass
    • খ) Avagadro's hypothesis
    • গ) gaseous volumes
    • ঘ) none ofthese
  • ০৭। A batch adiabatic reactor at an initial temperature of 373°K is being used for the reaction, A B. Assume the heat of reaction is - 1kJ/mole at 373°K and heat capacity of both A and B to be constant and equal to 50J/mole.K. The temperature rise after a conversion of 0.5 will be
    • ক) 5°C
    • খ) 10°C
    • গ) 20°C
    • ঘ) 100°C
  • ০৮। A batch reactor is
    • ক) suitable for gas-phase reactions on commercial scale.
    • খ) suitable for liquid phase reactions involving small production rate.
    • গ) least expensive to operate for a given rate.
    • ঘ) most suitable for very large production rate.
  • ০৯। A batch reactor is characterised by
    • ক) constant residence time.
    • খ) variation in extent of reaction and properties of the reaction mixture with time.
    • গ) variation in reactor volume.
    • ঘ) very low conversion.
  • ১০। A batch reactor is suitable for
    • ক) achieving cent percent conversion of reactants into products.
    • খ) large scale gaseous phase reactions.
    • গ) liquid phase reactions.
    • ঘ) obtaining uniform polymerisation products in highly exothermic reactions.
  • ১১। A batch reactor suffers from following disadvantage.
    • ক) Poor product quality control.
    • খ) High labour and handling cost.
    • গ) High shutdown time requirement for emptying, cleaning and refilling.
    • ঘ) All (a), (b)and(c).
  • ১২। A catalyst
    • ক) initiates a reaction.
    • খ) lowers the activation energy of reacting molecules.
    • গ) is capable of reacting with any one of the reactants.
    • ঘ) can not be recovered chemically unchanged at the end of a chemical reaction.
  • ১৩। A Catalyst
    • ক) increases the equilibrium concentration of the product.
    • খ) changes the equilibrium constant of the reaction.
    • গ) shortens the time to reach the equilibrium.
    • ঘ) none of these.
  • ১৪। A catalyst in a chemical reaction
    • ক) decreases the activation energy.
    • খ) alters the reaction mechanism.
    • গ) increases the frequency of collisions of reacting species.
    • ঘ) all (a), (b) and (c).
  • ১৫। A catalyst in a chemical reaction __________ free energy change in the reaction.
    • ক) increases
    • খ) decreases
    • গ) either (a) or (b); depends on the type of catalyst
    • ঘ) neither (a) nor (b).
  • ১৬। A catalyst inhibitor
    • ক) lessens its selectivity.
    • খ) may be useful for suppressing undesirable side reactions.
    • গ) is added in small quantity during the catalyst manufacture itself.
    • ঘ) all(a), (b) and (c).
  • ১৭। A catalyst is said to be a negative catalyst, ifit
    • ক) retards the rate of reaction.
    • খ) reduces the value of equilibrium constant.
    • গ) does not initiate the reaction.
    • ঘ) all (a), (b) and (c).
  • ১৮। A catalyst loses its activity due to
    • ক) loss in surface area of the active component.
    • খ) agglomeration of metal particles caused by thermal sintering of the solid surface.
    • গ) covering of the catalytic active sites by a foregin substance.
    • ঘ) all (a), (b) and (c).
  • ১৯। A catalyst promoter
    • ক) improves the activity of a catalyst.
    • খ) acts as a catalyst support.
    • গ) itself has very high activity.
    • ঘ) all (a), (b) and (c).
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