Description : In a coal-fired power plant, electrostatic precipitators are installed to control the emission of
Last Answer : In a coal-fired power plant, electrostatic precipitators are installed to control the emission of A. `CO` B. `SO_(2)` C. `NO_(8)` D. SPM
Description : In coal fired power plants, electrostatic precipitators are fitted to control emission of
Last Answer : In coal fired power plants, electrostatic precipitators are fitted to control emission of A. `NO_(x)` B. CO C. SPM D. `SO_2`
Description : Which one of the following cannot be controlled by a 3 way catalytic converter? (a) HC emission (b) CO emission (c) NOx emission (d) SPM emission
Last Answer : Ans :d
Description : Because less coal is consumed in this system, emissions of ______ and particulate and solid waste by products are reduced. a. Sulphur dioxide (SO2) b. Nitrogen oxide (NOx) c. Carbon dioxide (CO2) d. All of the above.
Last Answer : d. All of the above.
Description : What are the components responsible for acid rain? (1) Nitrogen monoxide (NO) and Carbon monoxide (CO) (2) Sulphur dioxide (SO2) and Nitrogen oxides (NOx) (3) Carbon dioxide (CO2) and Carbon monoxide (CO) (4) Oxides of carbon (COx) and Oxides of nitrogen (NOx)
Last Answer : (2) Sulphur dioxide (SO2) and Nitrogen oxides (NOx) Explanation: Acid rain is caused by emissions of sulfur dioxide (SO2) and nitrogen oxide (NO), which react with the water molecules in the ... in acid rain can cause paint to peel, corrosion of steel structures and weathering of stone buildings.
Description : Which of the following is the most severe air pollutant? (A) Hydrocarbons (B) NOx (C) SO2 (D) CO
Last Answer : (B) NOx
Description : 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 ... rate? (A) CO (B) SO2 (C) NOx (D) CFC (chloro fluoro carbons)
Last Answer : (A) CO
Description : What are the components responsible for acid rain? (1) Nitrogen monoxide (NO) and Carbon monoxide (CO) (2) Sulphur dioxide (SO2 ) and Nitrogen oxides (NOx ) (3) Carbon dioxide (CO2 ) and Carbon monoxide (CO) (4) Oxides of carbon (COx ) and Oxides of nitrogen (NOx )
Last Answer : Sulphur dioxide (SO2 ) and Nitrogen oxides (NOx )
Description : In large thermal power stations very fine particulates present in flue gas are removed by (A) Wet scrubber (B) Bag filter (C) Electrostatic precipitators (D) Dust catcher
Last Answer : (C) Electrostatic precipitators
Description : Which of the following is the common pollutant emitted from metallurgical smelters, thermal power plant and cement plants? (A) NOx (B) Hg (C) SO2 (D) F
Last Answer : (C) SO2
Description : Defines electrostatic precipitators. -SST 10th
Last Answer : Electrostatic precipitators have been the air pollution control technology of choice for power generation and industrial processes throughout the world. ESPs are highly efficient dust collectors with proven collection ... enter the unit and are then removed by the influence of an electric field.
Description : Cyclone collectors and electrostatic precipitators are meant ofor controlling
Last Answer : Cyclone collectors and electrostatic precipitators are meant ofor controlling A. Radioactive pollution B. ... C. Noise pollution D. Water pollution
Description : Cyclone collectors and electrostatic precipitators are meant for controlling
Last Answer : Cyclone collectors and electrostatic precipitators are meant for controlling A. Sewage pollution B. ... C. Pesticide pollution D. Natural pollution
Description : Electrostatic precipitators are employed to remove particulate pollutants of the size of
Last Answer : Electrostatic precipitators are employed to remove particulate pollutants of the size of A. `5-20 mum ` B. `20 - ... mum` and larger D. `0.5-5.0 mum`.
Description : What particle sizes are electrostatic precipitators used to remove?
Last Answer : A. Duprey conducted testing on an electrostatic precipitator in a pulp mill. The results were published in a National Air Pollution Control Administration report called “Compilation of air Pollutant Emission Factors”.
Description : The constituents of photochemical smog responsible for eye irritation are (A) SO2 and O3 (B) SO2 and NO2 (C) HCHO and PAN (D) SO2 and SPM
Last Answer : (C) HCHO and PAN
Description : Major aerosol pollutant in Jet Plane emission is a) SO2 b) CO c) CH4 d) CFC.
Last Answer : d) CFC.
Description : (3) Oxides of nitrogen and sulphur Explanation: Acid rain is caused by emissions of oxides of Sulfur and Nitrogen (Sulfur Dioxide and Nitrogen Oxide), which react with the water molecules in the ... The emissions of sulfur dioxide (SO2) and nitrogen oxides (NOx) result from fossil fuel combustion.
Last Answer : (3) live wire and the neutral wire Explanation: Three wires enter most homes from the power pole-two "hot" wires and a third "neutral" wire. Each hot wire provides 120- volt current for ... the main switch is put off because the electric circuit (the path where the electricity travels) gets opened.
Description : Smog is not formed due to the presence of __________ in the atmosphere. (A) SO2 (B) NOx (C) CO2 (D) Any of these
Last Answer : (C) CO2
Description : The main precursors of winter smog are (A) N2O and hydrocarbons (B) NOx and hydrocarbons (C) SO2 and hydrocarbons (D) SO2 and ozone
Last Answer : (C) SO2 and hydrocarbons
Description : Pick out the wrong statement. (A) Biological oxygen demand (B.O.D.) value of a sewerage sample is always lower than its chemical oxygen demand (C.O.D.) value (B) Environmental pollution by ... in but does not allow the short wavelength infra red radiation to escape out of the earth's atmosphere
Last Answer : (D) The characteristic of a green house body is that it allows the long wavelength incoming solar radiation to come in but does not allow the short wavelength infra red radiation to escape out of the earth's atmosphere
Description : The main function of primary air in pulverised coal fired burner is to (A) Burn CO to CO2 (B) Dry and transport the coal (C) Have proper combustion by supplying it around the burner (D) Preheat the tertiary air used for complete combustion of CO to CO2
Last Answer : (B) Dry and transport the coal
Description : Low NOx Combustion Technology Regulation in Japan for Coal Firing Boiler has reduced from 400 ppm to____ a. 100ppm b. 200ppm c. 300ppm d. 400ppm
Last Answer : Ans:- b. 200ppm
Description : Hyperbolic cooling towers used in a) Coal-fired power plant b) Nuclear plants c) Thermal power plant d) All of these
Last Answer : d) All of these
Description : Which of the following is considered a renewable resource? w) Coal fired power plant x) Hydroelectric dam y) Combustion turbine facility z) Nuclear fission power plant
Last Answer : ANSWER: X -- HYDROELECTRIC DAM
Description : (1) the action of ultraviolet rays on oxygen Explanation: The majority of tropospheric ozone formation occurs when nitrogen oxides (NOx), carbon monoxide (CO ) and volatile organic compounds (VOCs), such as xylene, ... violet rays. NOx, CO, and VOCs are called ozone precursors. CO + 2O2 + CO2 + O3
Last Answer : Water is not effective in extinguishing a fire caused by petrol because - (1) the flame is too hot for water to cool it down (2) water and petrol react chemically (3) water and petrol are ... (4) water and petrol are immiscible with each other and petrol which forms the upper layer continues to burn
Description : Automobile exhaust is passed through two compartments catalytic converter employing platinum as catalyst for (A) Conversion of CO into CO2 in the second compartment (B) Conversion of NOx into N2 and NH3 in the first ... of unburnt hydrocarbon fuel in the second compartment (D) All (A), (B) and (C)
Last Answer : (D) All (A), (B) and (C)
Description : Which of the following factors contribute to formation of photochemical smog? 1. Stable atmosphere 2. NOx 3. Solar insolation 4. CO (a) 1, 2, 3, & 4 (b) 2, 3 & 4 only (c) 1 & 4 only (d) 1, 2 and 3 only
Last Answer : (a) 1, 2, 3, & 4
Description : Emission of dense white smoke out of the chimney of a thermal power plant is an indication of the use of (A) Less air for combustion (B) Correct amount of air for combustion (C) Too much air for combustion (D) Pulverised coal in boilers
Last Answer : (C) Too much air for combustion
Description : The main industrial source of emission of hydrogen sulphide air pollutant is (A) Petroleum refineries (B) Coal based thermal power plants (C) Pulp and paper plant (D) Metallurgical roasting & smelting plant
Last Answer : (B) Coal based thermal power plants
Description : The hyperboloid cooling towers are often associated __ a. with nuclear power plants b. Used in some coal-fired plants c. In some large chemical and other industrial plants. d. All of the above.
Last Answer : All of the above
Description : A ultra-super critical boiler technology is today the option of choice for most new……. fired power stations. a) Coal b) Natural gas c) Biogas d) Oil
Last Answer : a) Coal
Description : Electricity generated by coal-fired power plants i the United States in 1990 was approximately what percentage of the entire electricity produced by all sources of power production? w) 10 percent x) 25 percent y) 55 percent z) 90 percent
Last Answer : ANSWER: Y -- 55 PERCENT
Description : Which of the following pollutants is absent in the emissions from a fertiliser plant? (A) SO2 & SO3 (B) NO2 (C) NH3 (D) CO
Last Answer : (D) CO
Description : Illustrate with neat sketch the process to control production of NOx in combustion chamber.
Last Answer : Method to control NOx: The EGR system is used to reduce the amount of NOx in the exhaust. NOx production increases as the temperature inside the combustion chamber rises due to acceleration or heavy engine loads, ... (less than 10% of total) to be supplied into the incoming air: fuel mixture.
Description : Kopper-Totzek coal gasifier (installed in a coal based nitrogeneous fertiliser plant) employs a/an __________ bed gasifier. (A) Entrained (B) Moving (C) Fixed (D) Fluidised
Last Answer : (A) Entrained
Description : The dominant source of pollution due to oxides of nitrogen (NOx) in urban areas is (A) Road trAns:port (B) Commercial Sector (C) Energy use in industry (D) Power plants
Last Answer : (B) Commercial Sector
Description : Acid rains are produced by (a) excess NO2 and SO2 from burning fossil fuels (b) excess production of NH3 by industry and coal gas (c) excess release of carbon monoxide by incomplete combustion (d) excess formation of CO2 by combustion and animal respiration.
Last Answer : (a) excess NO2 and SO2 from burning fossil fuels
Description : 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
Last Answer : (A) Reduce SO2 content in
Description : Name TWO sorbents which are used in conventional wet scrubbing processes to remove SO2 produced by combusting coal.
Last Answer : (1) LIME (2) LIMESTONE (3) SODIUM SULFITE OR NaCO3 OR NaOH
Description : Assuming the US reduces coal use due to negative externalities, should the US restrict coal exports to China and India who seek to use and build more coal-fired electrical generating plants?
Last Answer : Coal jobs are already being lost at an alarming rate. If we don’t mine it, it will come from other coal exporting countries. I don’t see any benefit to hurting ourselves in a futile attempt to manage other countries.
Description : Can coal-fired electricity generation have zero ghg emissions?
Last Answer : answer:The honest answer is no'. But it depends who's doing the talking. The coal lobby says they capture the CO2 and sequester it (Stick it someplace else). They ignore all the energy spent to dig it ... burning stove is close to net zero. If I allow my oil heat to kick on I am increasing GHGs.
Description : Overall thermal efficiency of a lumpy coal fired suitably designed heating furnace, if operated & maintained properly may be about __________ percent. (A) 10-15 (B) 25-30 (C) 45-50 (D) 65-70
Last Answer : (B) 25-30
Description : In case of pulverised coal fired steam boiler, the secondary air serves the main purpose of (A) Transportation of coal (B) Drying of coal (C) Combustion of coal by supplying it around the burner (D) Preheating the primary air
Last Answer : (C) Combustion of coal by supplying it around the burner
Description : Which of the following will be unsuitable for dust cleaning from flue gas at 400°C from a pulverised coal fired boiler? (A) Multicyclones (B) Bag filter (C) Wet scrubber (D) Hydrocyclones
Last Answer : (B) Bag filter
Description : The pollutant responsible for ozone holes is - (1) CO2 (2) SO2 (3) CO (4) CFC
Last Answer : (4) CFC Explanation: Chlorofluorocarbons (CFCs) have been held responsible for the depletion of ozone layer. The manufacture of CFCs has been phased out under the Montreal Protocol, and they are being replaced with other products such as HFCs.
Description : The most dangerous pollutant in vehicular emissions is A. CO B. SO2 C. CO2 D. O3
Last Answer : ANS: A
Description : The overall mass transfer co-efficient for the absorption of SO2 in air with dilute NaOH solution can be increased substantially by (A) Increasing the gas film co-efficient (B) Increasing the liquid film co-efficient (C) Increasing the total pressure (D) Decreasing the total pressure
Last Answer : (A) Increasing the gas film co-efficient