276. The maximum CO2 is emitted into the atmosphere by
277. Which of the following is not a practical method of low level radioactive waste disposal ?
278. Major sources of noise in furnace operation arises from air inspirators, combustion, side wall vibrations and fluctuation in the process heat load. A 50% increase in fuel firing rate may increase the furnace noise level by about __________ decibels.
279. Removal of __________ results from the disinfection of water.
280. Very small amount of air pollutants are present in stratosphere also; though most of the atmospheric pollutants are present in the troposphere. Which of the following atmospheric pollutants does not cause the ozone layer depletion in atmosphere at tremendous rate ?
281. Carcinogenic air pollutants cause
282. Inhalation of silica dust by human being during hand drilling in mica mining, lead & zinc mining, silica refractory manufacture and in foundaries causes
283. Soluble silica present in boiler feed water can be removed by
284. Presence of non-biodegradable substances, like alkyl benzene sulphonate (ABS) from the detergents in polluted water stream causes
285. Radioactive solid nuclear wastes are disposed off by
286. Growth of __________ is promoted by the presence of manganese in water.
287. Average human body contains about __________ percent water by weight.
288. Noise level audible to audience sitting in the 5th row from the stage during a large orchestra show corresponds to about __________ decibels.
289. If carbon monoxide content in atmospheric air exceeds __________ ppm, death is bound to occur.
290. Suspended solid present in the waste water generated in blast furnace gas cooling and cleaning plant is removed by
291. Persons working in cement plants and limestone quarries are more prone to disease like
292. Particulates (< 1μm size) remaining suspended in air indefinitely and transported by wind currents are called
293. Operating principle of cyclone separator is based on the action of __________ dust particles.
294. Exposure to small amount of __________ results in high blood pressure & heart disease in human beings.