Ans: Chemical
2. Acidic attack will occur if the boiler water pH drops to below
Ans: 8.5
3. Water cooling systems are of __ types
Ans: 2
4. Iron and steel industry use ___ reactions in blast furnances
Ans: Reduction
5. Metallic oxides cause the following except?
Ans: Restriction of deposits of non oxides
6. Wastes buried decompose by ___ process
Ans: Anaerobic
7. In the presence of ultra violet radiation ____ and hydrocarbon ubdergo photochemical decomposition to produce ozone
Ans: Nitorgen oxides
8. Screening process in water treatment is referred to as the ___ treatment
Ans: Preliminary
9. Calcium and magnesium ions in water will cause ?
Ans: Hardness
10.Boiler water system is used for heating under ___conditions
Ans: Controlled
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