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TLS Online TPP Program

#Question id: 15717

 In The Origin of Species, Darwin propounded two major hypotheses:

#Unit 9. Evolution & Diversity of Life Forms
  1. that organisms have descended, with modification, from common ancestors; and that the chief cause of modification is natural selection acting on hereditary variation.
  2. that organisms have descended, with modification, from separate ancestors; and that the chief cause of modification is natural selection acting on hereditary variation
  3. “facts” are in some cases simple, confirmed observations; in other cases, a “fact” is a hypothesis that has acquired so much supporting evidence that we act as if it is true.
  4. A body of ideas about the causes of evolution
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TLS Online TPP Program

#Question id: 21945

#Unit 12. Biochemical Engineering

Increasing aeration at a particular rpm does not always lead to increase in oxygen mass transfer in a bioreactor. This is because
TLS Online TPP Program

#Question id: 21947

#Unit 12. Biochemical Engineering

Match the KLa determination method in Group I with the characteristics of the method in 1 Group II

P.

oxygen balance method

 1.  

aeration of an actively respiring culture is stopped and switched on again

Q

static gassing out technique

 2.

yields greater OTR and KLa than other methods

R.

dynamic gassing method

 3.

It can be done precisely only at steady state

S.

sodium sulphite oxidation method

 4.

Non respiring biological system is required

TLS Online TPP Program

#Question id: 21948

#Unit 12. Biochemical Engineering

Under unaerated condition in a fermentor, the power consumed by a single impeller was 10,000 W. The diameter of the impeller D is 1m and the density of the medium is 1000 kg/m3 and the stirrer speed is 1s-1. If one more impeller is added to the fermentor, power consumption would be approximately
TLS Online TPP Program

#Question id: 21971

#Unit 12. Biochemical Engineering

In an anaerobic fermentor, broth is agitated intensely at 100rpm in a 3.0 m3 baffled tank using a Rushton turbine with diameter of 0.5m. If the diameter of the
impeller is decreased to 0.25m the mixing time in (seconds) would approximately increase ………fold
TLS Online TPP Program

#Question id: 21978

#Unit 12. Biochemical Engineering

The ethanol yield per unit mass of substrate consumed (YP/S ) in an anaerobic fermentation process can be improved by
TLS Online TPP Program

#Question id: 21320

#Unit 12. Biochemical Engineering

In a lab scale reactor, the size of the air bubbles in the reactor is primarily determined by