Siderosis is a disease caused by the inhalation of ______________ dust?
Siderosis is a disease caused by the inhalation of ______________ dust?
A. Coal
B. Silica
C. Iron
D. None of these
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The widest explosive limit is of _____________, thereby making it the most explosive gas?
The widest explosive limit is of _____________, thereby making it the most explosive gas?A. Acetylene
B. Petrol vapor
C. Hydrogen
D. Carbon monoxideThe main pollutant in waste water discharged from a petroleum refinery is oil (both in free and emulsified form). Free oil is removed by_________________?
The main pollutant in waste water discharged from a petroleum refinery is oil (both in free and emulsified form). Free oil is removed by_________________?A. Biological oxygen pond
B. Aerated lagoons
C. Trickling filters
D. Gravity separator having oil skimming devicesInfective bacteria in water is killed by the _____________ process?
Infective bacteria in water is killed by the _____________ process?A. Sterilisation
B. Aeration
C. Disinfection
D. None of theseDeaeration of high pressure boiler feed water is done to reduce ___________________?
Deaeration of high pressure boiler feed water is done to reduce ___________________?A. Foaming from boilers
B. Its dissolved oxygen content
C. Its silica content
D. Caustic embrittlementWhich of the following is the most detrimental for water used in high pressure boiler ?
Which of the following is the most detrimental for water used in high pressure boiler ?A. Silica
B. Turbidity
C. Phenol
D. Dissolved oxygenWhich of the following pollutants is absent in the emissions from a fertiliser plant ?
Which of the following pollutants is absent in the emissions from a fertiliser plant ?A. SO2 & SO3
B. NO2
C. NH3
D. CO