Chemical Reaction Engineering - I Mid - II, November - 2014

1.If the rate equations are known for the individual reactions, we can ----------- determine the product distribution and reactor size requirements
  • Quantitatively
  • Qualitatively
  • Optimum
  • None
Answer: A
2.If reaction proceeds by , it is called --------- reaction.
  • Reversible
  • Irreversible
  • Reverse & irreversible
  • None
Answer: C
3.In a reaction A→R →S, the zero order followed by first reaction then tRMax=
  • CA0/ k1
  • k1/ CA0
  • k1
  • None
Answer: A
4.In a reaction A→R →S, the rate constants for ‘A to R’ and ‘R to S’ are k1and k2. Then the rate of reaction of R is
  • rR= k1CA– k2CR
  • rR= k2CA– k1CR
  • rR= k1CR– k2CA
  • None
Answer: A
5.In a reaction A→R →S, the first order followed by zero reaction then CRMax=
  • CA0[1-K(1-lnK)]
  • [1-K(1-lnK)]
  • CA0[K(1-lnK)]
  • None
Answer: A
6.In gas reactions, for an increase in pressure, conversion drops when the no of moles with reaction
  • Increases
  • Decreases
  • Unaffected
  • None
Answer: A
7.The thermodynamic equilibrium constant is unaffected by
  • Pressure of system
  • Presence ofinerts
  • Kinetics of reaction
  • All of above
Answer: D
8.The equilibrium conversion increases with increase in temperature for ------ reaction
  • Endothermic
  • Exothermic
  • Catalytic reaction
  • None
Answer: A
9.If the heat of reaction is negative, it is an --------------- reaction.
  • Endothermic
  • Exothermic
  • Catalytic reaction
  • None
Answer: B
10.The equilibrium constant relation from thermodynamics is
  • ΔG0= RT ln K
  • ΔG0= - RT ln K
  • ΔG0= - RT/ ln K
  • none
Answer: B
11.The dimensionless reaction rate group for first order reaction is defined as ---------------------------
Answer: k
12.‘N’ PFR’s in series with a total volume V gives the --------- conversion as a single PFR of volume V.
Answer: Same
13.In a PFR, the ratio of volume of fluid returned to the reactor entrance to volume of fluid leaving the system is known as -----------------
Answer: Recycle ratio
14.Single reactions requires ------------------- rate expression is required to describe the kinetics.
Answer: One
15.The ratio of MFR and PFR volumes is --------------------- always with reaction order.
Answer: Increases
16.Overall fractional yield is the ratio of all R formed to -----------------------------------.
Answer: All are reacted
17.Selectivity is the ratio of Moles of desired product formed to -------------------------.
Answer: MFR
18.Semi batch reactor is preferred when a -------------------------------.
Answer: Selectivity
19.The dimensionless reaction rate group for first order reaction is defined as ---------------------------.
Answer: Higher order
20.The important factor in comparing design of single reaction is ------------------------------------.
Answer: Reactor size