200 Best MCQs on sterilization- biochemical engineering
Q9). For indirect heating, the plate and frame heat exchanger is generally more effective than the shell and tube heat transfer due to its
a).larger heat transfer area
b).smaller heat transfer area
c).lesser cost
d).more number of plates
Correct Answer:
larger heat transfer area
Explaination:
Q10). The mechanism of air filtration in fibrous filter is
a).electrostatic attraction
b).impaction
c).interception
d).all of these
Correct Answer:
all of these
Explaination:
Q11). For the turbulent flow, the dispersion coefficient is correlated as a function of
a).Reynolds number
b).Sherwood number
c).Schmidt number
d).Grashof number
Correct Answer:
Reynolds number
Explaination:
Q12). In sterilization process, spore of which of the following organism is considered as control?
a).Bacillus subtilis
b).Clostridium botulinum
c).Bacillus stearothermophilus
d).Aspergillus niger
Correct Answer:
Bacillus stearothermophilus
Explaination:
Q13). The typical size of particles collected by diffusion mechanism is
a).<0.25μm
b).<0.5μm
c).<0.75μm
d).<1μm
Correct Answer:
<0.5μm
Explaination:
Q14). The X90 value for a filtration system is
a).the time required to reduce microbial population by 90%
b).the time required to traverse survivor curve by one log cycle.
c).the depth required to reduce population by 90%
d).the depth of the filter required to reduce population by 99%
Correct Answer:
the depth required to reduce population by 90%
Explaination:
Q15). The value of K
a).increases with increase in air velocity
b).decreases with increase in air velocity
c).increases to an optimum with increase in air velocity and decreases on further increase of air velocity
d).none of these
Correct Answer:
increases to an optimum with increase in air velocity and decreases on further increase of air velocity
Explaination:
Q16). The collection efficiency by impaction increases with
a).increasing particle diameter
b).increasing air flow velocity
c).both (a) and (b)
d).increasing particle size
Correct Answer:
both (a) and (b)
Explaination: