Chemical Engineering MCQs

Page No. 62

Insufficient washing of sand grains in a rapid sand filter causes__________________?


aAir binding


bShrinkage of filtering media


cMud balls


dExpansion of filtering media


View Answer Mud balls

In sewage treatment, the detention period allowed for oxidation ponds ranges from _____________ weeks?


a1 to 2


b4 to 5


c 9 to 10


d15 to 20


View Answer 4 to 5

Exposure to SO2 containing chimney gases results in the__________________?


aReduction in strength of leather & cloth


b Acceleration of corrosion rates of metals


cIncreased drying & hardening time of paints


dAll A., B. and C.


View Answer All A., B. and C.

Higher concentration of nitrogen dioxide in atmospheric air causes___________________?


aCancer


bBronchitis


cAsphyxiation


dCorrosion


View Answer Bronchitis

Which is the most widely used coagulant for the treatment of turbid water ?


aAlum (aluminium sulphate)


bLime


cFerric chloride


dSodium aluminate



A man exposed to excessive noise level in the working environment may suffer from____________________?


aHearing loss


bRupture of ear drum


cNervousness & fatigue`


d All A., B. & C.


View Answer All A., B. & C.

5-200 μm size particles are called__________________?


aColloids or aerosols


bPowder


cDust


dSmoke


View Answer Colloids or aerosols

Lagoons used for purification of polluted water_______________?


aAre large shallow artificial lakes also known as clarification lakes, maturation ponds or oxidation ponds


b Use micro-organisms/bacteria in presence of dissolved oxygen


cGives an excellent final effluent (with 3 to 4 lagoons arranged in series) having suspended solid < 1 mg/litre and BOD = 3.8 mg/litre


d All A., B. & C.


View Answer All A., B. & C.

Which of the following is the most efficient for removal of very finely divided suspended solids and colloidal matter from the polluted water stream ?


a Sedimentation tank


bCircular clarifier


cMechanical flocculation


dChemical coagulation


View Answer Chemical coagulation

The most commonly used chemical coagulant in water treatment is________________?


aFerrous sulphate


bAlum


cLime


d Hydrazine


View Answer Alum

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