Biochemical Reaction Engineering Mid - I, September - 2014

1.In ------------ type of sterilization steam is added directly along the medium continuously.
  • steam jet
  • vacuum
  • batch
  • semibatch
Answer: A
2.Sterilization can also be brought about by 
  • low pH
  • inhibitors
  • both
  • none
Answer: C
3.…………………………….media may require small amount of heating for sterilization.
  • synthetic
  • crude
  • natural
  • none
Answer: A
4.In CSTR with recycle, the ----------- rate is larger than the organisms specific growth rate dilution
  • dissociation
  • transport
  • all
Answer: A
5.In CSTR with recycle biomass production rate is greater than without recycle by a factor of
  • (1-a(b-1))-1
  • (b-1)
  • (a-(b-1))-1
  • (1-b(a-1))-1
Answer: A
6.In CSTR wall growth acts as --------------- which prevents washout.
  • product
  • feed
  • sterile feed
  • nonsterile feed
Answer: D
7.In a batch reactor, concentration of cells, nutrients, and product-------------- with time.
  • vary
  • do not vary
  • may or may not vary
  • none
Answer: A
8.Baffles are used in stirred reactors to reduce
  • Clogging
  • Channeling
  • vortexing
  • turbulence
Answer: C
9.In bubble column reactors aeration and mixing are achieved by
  • impeller
  • gas sparging
  • liquid sparging
  • propeller
Answer: B
10. …………………………….. reactors are used in brewing and production of vinegar.
  • fluidized bed
  • packed bed
  • trickle bed
  • bubble column
Answer: A
11.The rate of destruction of microorganisms by steam or moist heat is known as---------------kinetics.
Answer: Death
12.Ultraviolet rays in the wavelength range ------------- are effective are effective in killing air borne microbes.
Answer: 2265-3287A
13.Dilution rate is given by ----------------.
Answer: F/VR
14.In a continuous culture, a nonzero cell population can be maintained when -----------------.
Answer: D=μ
15.In a trickle bed reactor ------------ phase is not continuous throughout the column and gases move with relative ease.
Answer: Liquid
16.Damage due to --------------- is minimal in packed bed compared to stirred reactors.
Answer: Particle attrition
17.In a fluidized bed reactor, as the particles are in constant motion -------------- of the bed can be avoided.
Answer: Channeling
18.In -------------- reactors mixing is accomplished without mechanical agitation.
Answer: Bubble column/airlift
19.Eadie-hofstee plot for evaluation of kinetic parameters, v is graphed against ------.
Answer: V vs V/S
20.In CSTR the concentration in any phase do not vary with ------------ inside the reactor.
Answer: Position