A. Deaeration of feed water
B. Enhancing pH of feed water by adding alkali
C. Feeding sodium sulphite or hydrazine phosphate to the boilers, which combines with oxygen
and prevents corrosion
D. All A., B. and C.
Related Mcqs:
- Limestone powder is injected during pulverised coal burning in boilers to ______________ the flue gases?
A. Reduce SO2 content in
B. Catalytically convert SO2 to SO3 in
C. Increase the dew point of
D. None of these - Radioactive solid nuclear wastes are disposed off by _________________?
A. High temperature incineration
B. Pathological incineration
C. Pyrolysis
D. Underground burial in concrete containers - Ringelmann chart No. 2 corresponds to _______________ percent black smoke?
A. 10
B. 20
C. 40
D. 80 - Which of the following industries discharge mercury as a pollutant ?
A. Chloro-alkali industry
B. Tanneries
C. Beverage plant
D. Phosphoric acid plant - Presence of soluble organics in polluted water causes_________________?
A. Undesirable plants growth
B. Depletion of oxygen
C. Fire hazards
D. Explosion hazards - Radioactive substances present in the polluted water stream can be removed by_________________?
A. Biological oxygen treatment
B. Coagulation and filtration
C. Adsorption in ion exchange materials
D. None of these - Photochemical smog is formed from automobile exhaust ________________?
A. By reaction of hydrocarbon & nitric oxide in presence of sunlight
B. Appears only on sunny days
C. Is harmful for crops and trees also besides causing eye irritation & asthma
D. All A., B. & C. - Lead exhausted in the atmosphere by automobiles using leaded petrol (i.e. tetraethyl lead for improving octane number) is a lethal air pollutant which causes_________________?
A. Paralysis of muscles & loss of appetite
B. Nervous depression
C. Gastritis and diarrhea
D. All A., B. and C. - Carbon monoxide is a pollutant, which causes_________________?
A. Respiratory disease (e.g. asthma)
B. Asphyxiation (suffocation) leading to death
C. Retardation in crop growth
D. Damage to building materials like marble - Noise level during normal conversation among men is about ______________ decibels?
A. 10
B. 45
C. 90
D. 115
