Top 250+ Solved Waste Water Treatment MCQ Questions Answer
Q. The chemical formula of Permutit is ____________
a. SiOAl2O3Na2O
b. SiO2Al2O3Na2O
c. SiO2Al2O3NaO
d. SiO3Al2O3Na2O
Q. Permutit has an exchange value of ________ grams of hardness per m3 of zeolite.
a. 10,000
b. 20,000-30,000
c. 35,000-40,000
d. 40,000-50,000
Q. The thickness of the layers of filter sand of zeolite softener is ____________
a. 20cm
b. 30cm
c. 40cm
d. 100cm
Q. Which of the following is a disadvantage of the zeolite process?
a. No sludge is formed
b. The process is almost automatic
c. Suspended impurities get deposited around the zeolite particles
d. Zero hardness can be occurred
Q. Water is mainly used in boilers for the generation of ________________
a. Power
b. Electricity
c. Steam
d. Current
Q. Which of the following should not be a composition of boiler-feed water?
a. Hardness should be below 0.2ppm
b. Its caustic alkalinity should lie between 0.15 to 0.45 ppm
c. Its soda alkalinity should be 0.45-1 ppm
d. Its caustic alkalinity should be 1.5-2 ppm
Q. Which of the following is not a result of the excess of impurity in boiler-feed?
a. Scale and sludge formation
b. Decomposition
c. Corrosion, priming and foaming
d. Caustic embrittlement
Q. If the precipitate formed is soft, loose and slimy, these are __________ and if the precipitate is hardand adhering on the inner wall, it is called _____________
a. Sludges, scale
b. Scale, sludges
c. Sludges, rodent
d. Scale, rodent
Q. Which of the following option is incorrect about the sludges?
a. Sludges are soft, loose and slimy precipitate
b. They are non-adherent deposits and can be easily removed
c. Formed generally at heated portions of the boiler
d. Can be removed by blow down operation
Q. The propulsion of water into steam drum by extremely rapid, almost explosive boiling of water at theheating surface is called ___________
a. Foaming
b. Priming
c. Corrosion
d. Caustic embrittlement
Q. The phenomenon during which the boiler material becomes brittle due to accumulation of causticsubstances is known as ___________
a. Foaming
b. Priming
c. Corrosion
d. Caustic embrittlement
Q. Foaming is caused by the formation of ___________
a. Acids
b. Alcohols
c. Oils and alkalis
d. Ketones
Q. The term ‘Sullage’ refers to:
a. Fresh wastewater
b. Septic wastewater
c. Wastewater from kitchen, laundry
d. Toxic wastewater
Q. Wastewater can become septic by the loss of:
a. Dissolved oxygen content
b. Carbon content
c. Organic compounds
d. Water content