Question

Which of the following statements are wrong?

(a) Micro-organism cell wall rupture takes place under high shear stress

(b) Escape velocity decreases with increase in tank size

(c) Heat sterilization avoids contamination of pure cultures in fermenters

(d) Rapid fermentation rates is a pre-requisite for successful fermentation process

I have been asked this question in a job interview.

This intriguing question comes from Natural Products in chapter Natural Products of Chemical Technology

Answer 1

Correct answer is (b) Escape velocity decreases with increase in tank size

The best explanation: Escape velocity = V*v/A, where A is the unused gas escape area, V is total volume; v is the volume of air per unit volume of liquid per unit time. V varies as D^3, A varies as D^2. Hence escape velocity is linearly proportional to D, which means escape velocity increases with increase in tank size.