Chemical Engineering MCQs

Page No. 53

Pick out the wrong statement. A. Caustic embrittlement of boiler’s metallic parts is caused by high concentration of caustic soda in boiler feed water___________________?


aCooling and freezing of water kills the bacteria present in it

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bWith increasing boiler operating pressure of steam, the maximum allowable concentration of

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csilica in feed water goes on decreasing

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dDissolved oxygen content in high pressure boiler feed water should be nil

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Presence of a certain minimum quantity of fluorine is desirable in potable water to prevent___________________?


aDental cavities

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bScale formation

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cWater-borne disease

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dCorrosion

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View Answer Dental cavities

Bacterial aerobic oxidation of polluted water in biological oxidation ponds is done to purify it. Presence of bacteria helps in____________________?


a Coagulation and flocculation of colloids

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bOxidation of carbonaceous matter to CO2

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cNitrification or oxidation of ammonia derived from breakdown of nitrogenous organic matter

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dAll A., B. and C.

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View Answer All A., B. and C.

TLV of mercury in potable (drinking) water is about ______________ ppm?


a 0.001

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b0.1

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c1

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d5

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View Answer 0.001

Presence of iron and manganese in water causes___________________?


aReduction in its dissolved oxygen content

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bDiscoloration of bathroom fixtures

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cTemporary hardness

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dNone of these

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Presence of soluble organics in polluted water causes_________________?


aUndesirable plants growth

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bDepletion of oxygen

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cFire hazards

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dExplosion hazards

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Persons working in cement plants and limestone quarries are more prone to disease like__________________?


aCancer

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bAsthma

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cSilicosis

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d Fluorosis (bone disease)

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View Answer Silicosis

The ratio of oxygen available to the oxygen required for stabilisation of sewage is called the __________________?


aBacterial stability factor

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bRelative stability

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cBiological oxygen demand (BOD)

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dOxygen ion concentration

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View Answer Relative stability

Siderosis is a disease caused by the inhalation of ______________ dust?


aCoal

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bSilica

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cIron

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dNone of these

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View Answer Iron

Lagooning process is mainly a means of the__________________?


aSludge disposal

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bReduction of excessive flow in sewers

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cBiological treatment of wastes

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dNone of these

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View Answer Sludge disposal

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