200 Best MCQs on Water Treatment- biochemical engineering
Q33). Calgon is used for removal of
a).sodium carbonate
b).permanent hardness of water
c).potassium carbonate
d).none of these
Correct Answer:
permanent hardness of water
Explaination:
Q34). The water being used in dairy industry should contain not more than
a).5 proteolytic and/or lipolytic organisms per ml
b).10 proteolytic and/or lipolytic organisms per ml
c).15 proteolytic and/or lipolytic organisms per ml
d).20 proteolytic and/or lipolytic organisms/ml
Correct Answer:
5 proteolytic and/or lipolytic organisms per ml
Explaination:
Q35). The activated sludge process consists of returning a portion of the clarifier
a).effluent water entering the reactor
b).influent water coming out of the reactor
c).influent water entering the reactor
d).effluent water coming out of the reactor
Correct Answer:
influent water entering the reactor
Explaination:
Q36). The activated sludge process is sometime referred as
a).fluid bed biological oxidation system
b).fixed bed biological oxidation system
c).turning bed biological oxidation system
d).none of the above
Correct Answer:
fluid bed biological oxidation system
Explaination:
Q37). BOD stands for
a).biochemical oxygen demand
b).british oxygen demand
c).british oxygen depletion
d).biological oxygen depletion
Correct Answer:
biochemical oxygen demand
Explaination:
Q38). When temporary hard water is boiled, one of the substances formed is
a).calcium bicarbonate
b).calcium sulfate
c).hydrogen chloride
d).carbon dioxide
Correct Answer:
carbon dioxide
Explaination:
Q39). Zeolite softening process removes both temporary and permanent hardness of water. In this process the calcium and magnesium present in water are precipitated as
a).insoluble carbonates
b).insoluble zeolites
c).insoluble chlorides
d).insoluble sulfates
Correct Answer:
insoluble zeolites
Explaination:
Q40). The methods used for biological treatment are
a).lagoon
b).activated sludge process
c).oxidation ditches
d).all of these
Correct Answer:
all of these
Explaination: