A. Low amount of excess combustion air
B. Large quantity of excess combustion air
C. Hydrocarbon fuel
D. Pulverised coal as fuel
Correct Answer: Low amount of excess combustion air ✔
Last Updated: March 11, 2019
Related MCQs
- Presence of nitrates in water in excess of 50 ppm causes__________?
- Which is the most efficient dust removal equipment for removal of submicronic dust particles from blast furnace gas ?
- Pick out the wrong statement ?
- Ethanolamine is an absorbent used for the removal of __________ from air/gas?
- Threshold limit value (TLV) of CO in air is __________ ppm?
- There are five concentric layers within the atmosphere which is differentiated on the basis of temperature. The atmospheric layer which lies close to the earth’s surface in which human being along with other organisms live is called troposphere. The rate at which air temperature in the troposphere gradually decreases with height is about __________ °C/km?
- Which of the following is the most widely used disinfectant in water treatment ?
- Which of the following is not a natural source of air pollution ?
- Removal of __________ results from the disinfection of water?
- A standard test for determination of hardness in water is termed as __________ test?
- The function of skimming tank in sewage treatment is to remove __________ substances?
- Lung cancer & DNA breakage are the major ill effects of excessive ozone exposure to human beings. Ozone layer depletion in the atmosphere is mainly caused by the presence of__________?
- Which of the following is the most active zone of atmosphere in which weathering events like rain, storm & lightning occur ?
- Which of the following is a manmade source of air pollution ?
- Workers working in __________ industry are most prone to white lung cancer?
- The weakest sound that can be heard by a person in a quiet environment is equivalent to __________ decibel ?
- __________ content of the phosphate rock is the pollutant of primary interest in a phosphatic fertiliser plant ?
- Oilish impurities present the effluent discharged from the electroplating industry is normally not removed by __________?
- Ringelmann chart No. 2 corresponds to __________ percent black smoke?
- Global warming may result in __________?
- Disinfection of water is done to destroy pathogenic bacteria and thus prevent water-borne diseases. Disinfection of water may be done by the use of__________?
- Which of the following is not a practical method of low level radioactive waste disposal ?
- The effect of increase in carbon dioxide level of the atmosphere and its profound effect on our climate is called the __________?
- Which of the following is an adsorbent for removal of nitrogen oxides from gas/air ?
- Green house gases blanket/block the infrared radiation from earth’s surface to the atmosphere leading to its progressive warming up. Which of the following gases does not exhibit green house effect ?
- High noise levels produced during operation of fans and compressors can be reduced by using__________?
- Salt content in sea water is about __________ percent?
- __________ is the process of killing organism in water ?
- Fresh sewage is __________ in nature?
- From pollution control point of view, the maximum permissible concentration of sulphur dioxide in atmospheric air is about __________ ppm?
- Maximum permissible concentration (i.e. TLV) of DDT in public water supply system is __________ micro gram (μ g)/litre?
- Which of the following fine dust removal equipments is the most efficient ?
- Noise level in a quiet private business office is about __________ decibels?
- Which of the following is not a weightless pollutant ?
- Noise pollution level in a chemical plant is expressed in __________?
- Smog is __________?
- Threshold limit value (TLV) i.e., the maximum permissible safe limit of phosgene gas which Hitler used to use to kill his enemies in ‘gas chamber’ is about __________ ppm?
- For existence of aquatic life in water, the dissolved oxygen content in it, should not be less than __________ ppm?
- 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 ?
- The term Biological Oxygen Demand (BOD) is used in relation to __________?
- The upper layer of atmosphere is called the __________?
- CFC (chloro fluoro carbon) is very highly reactive in causing depletion of ozone layer in the atmosphere. Each atom of chlorine liberated from CFC is capable of decomposing __________ molecules of ozone?
- The average thickness of ozone layer in stratosphere is about __________ dobson unit (DU)?
- Noise level audible to audience sitting in the 5th row from the stage during a large orchestra show corresponds to about __________ decibels?
- Disinfection of water is done to remove __________?
- In water treatment plant, zeolite process is used to remove the __________ of water?
- On prolonged exposure to high concentration of carbon monoxide (> 5000 ppm), man dies because __________?
- There are thirteen metals which are treated as pollutants. Which of the following metals is not a pollutant ?