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Suspended solid present in the waste water generated in blast furnace gas cooling and cleaning plant is removed by
Persons working in cement plants and limestone quarries are more prone to disease like
Operating principle of cyclone separator is based on the action of __________ dust particles.
Exposure to small amount of __________ results in high blood pressure & heart disease in human beings.
Particulates (< 1μm size) remaining suspended in air indefinitely and transported by wind currents are called
Maximum allowable concentration of CO2 in air for safe working is __________ ppm (parts per million).
Tolerable limit of nitrogen oxides in air is __________ ppm.
Iron & manganese present as pollutant in water can not be removed by
In water chemical treatment plant, use of chloramines ensures
Which of the following is the common pollutant emitted from metallurgical smelters, thermal power plant and cement plants ?
H2S present in gaseous stream can be removed by adsorption on
During which of the following operating conditions of an automobile, carbon monoxide content in the exhaust gas is maximum ?
Replenishment of dissolved oxygen in water stream polluted with industrial waste occurs by
Inhalation of lead compounds present in automobile exhaust (using leaded petrol) causes
Aerodynamic noise resulting from turbulent gas flow is the most prevalent source of valve noise in fluid ilow control. It is caused due to
Fluorosis (a bone disease) is caused by the presence of high concentration of __________ in atmospheric air.
Threshold Limit Value (TLV) is the maximum allowable concentration (i.e. safe limit) of pollutants in air. Safe limit for SO2 in air is __________ ppm.
Exposure to chemicals having carcinogenic properties cause
Main pollutants released from iron & steel industry is
Noise level heard at a distance of about 100 metres from a jet engine with after burner is about __________ decibels.
TLV of mercury in potable (drinking) water is about __________ ppm.
Which is the best and the most effective method for the removal of organic contaminant present in the polluted water in very small quantity (say < 200 mg/litre)?