0% 0 Chemical Environmental Engineering Quiz 3 1 / 50 Noise level heard inside a bus in busy city traffic or inside a sub-way train corresponds to about _______ decibels? 120 95 75 140 2 / 50 On prolonged exposure to high concentration of carbon monoxide (> 5000 ppm), man dies because ___________? It forms CO2 by combining with oxygen present in the blood It forms carboxyhemoglobin by combining with haemoglobin of blood, thereby making it incapable of absorbing oxygen Of jamming of respiratory tract Of clotting of blood 3 / 50 Maximum permissible residual chlorine in treated water should be _____ mg/litre? 0.2 to 0.3 5 to 10 0.001 to 0.01 2 to 3 4 / 50 Maximum permissible concentration (i.e. TLV) of DDT in public water supply system is ________ micro gram (? g)/litre? 42 332 22 1050 5 / 50 Polyvinyl chloride containers are not suitable for storing__________? None of these Foodstuffs Metallic powder Woolen clothes 6 / 50 Noise level inside a jet airliner in normal flight is about _______ decibels? 80 150 100 125 7 / 50 Noise level during normal conversation among men is about _______ decibels? 115 45 90 10 8 / 50 Ozone is___________? A secondary pollutant Impervious to ultra-violet rays Both B. and C. A primary pollutant 9 / 50 Oilish impurities present the effluent discharged from the electroplating industry is normally not removed by _______? Floatation & skimming Chemical coagulation Ultra filtration Centrifugation 10 / 50 Photochemical smog is formed from automobile exhaust _________? Appears only on sunny days Is harmful for crops and trees also besides causing eye irritation & asthma By reaction of hydrocarbon & nitric oxide in presence of sunlight All A., B. & C. 11 / 50 Noise produced by cooling fans (employed in air cooled heat exchangers or cooling tower) is mainly caused due to the turbulence created by blade passage through air. It can be reduced by use of a slower fan__________? Both A. & B. Of increased diameter With greater number of blades Neither A. nor B. 12 / 50 Maximum permissible turbidity in potable water is ______ ppm? 1 250 1000 10 13 / 50 Pick out the wrong statement? Catalytic converter is fitted in automobiles to reduce carbon monoxide concentration in exhaust emissions Sulphur dioxide is the main pollutant emitted from the exhaust of petrol driven automobiles Inhalation of pollutant carbon monoxide results in death by asphyxiation Decomposition of plants containing chlorophyll is a natural source of carbon monoxide in atmosphere 14 / 50 Peroxyacetyl nitrate (PAN), a pollutant is found in the__________? Exhaust of nitric acid plant Automobile exhaust Exhaust of sulphuric acid plant Flue gas of coal based power plant 15 / 50 Maximum allowable noise exposure limits for a man working for 8 hours a day in a noisy chemical plant is about _______ decibels? 20 90 60 120 16 / 50 Pick out the wrong statement ? The concentric layer in atmosphere which contains about 70% of the total mass of atmosphere and characterised by a steady decrease in temperature is called stratosphere The earth?s atmosphere is an envelope of gases extending upto a height of about 200 kms Troposphere is a turbulent dusty zone containing much of water vapor and clouds Stratosphere is rich in ozone and is located just above the troposphere 17 / 50 Pick out the correct statement ? Lightening discharges are natural source of production of SO2 & H2S pollutant Deforestation helps in controlling the green house effect Global warming is detrimental for increase in food productivity and may cause flood and cyclone Sulphur dioxide causes death by asphyxiation 18 / 50 Maximum permissible limit of industrial noise as recommended by World Health Organisation (WHO) is ______ decibels? 75 35 95 105 19 / 50 Out of the following, TLV of ________ is maximum (about 500 ppm)? Carbon dioxide Acetaldehyde Toluene Carbon disulphide 20 / 50 Permissible safe limit (TLV) of ______ toxic gas is 100-1000 parts per million (ppm)? Very extremely Extremely Highly Moderately 21 / 50 Pollution by particulate matter emission in the atmosphere does not take place during metal______? Machining Cutting Polishing Grinding 22 / 50 Phenolic water generated in coke ovens & by-product plant of a steel plant are disposed off by__________? Quenching of hot coke None of these Filtration and recycling for cooling coke oven gas Discharging in the river stream 23 / 50 Main pollutants released from iron & steel industry is___________? SO3, NO2 & CO2 CO2, H2S & NO2 H2S, NO & SO3 CO, CO2 & SO2 24 / 50 Moist atmospheric air at high temperature (e.g., in summer) having high concentration of sulphur dioxide causes_________? Corrosion, tarnishing & soiling of metals Fading of dyes on textiles All A., B. and C. Reduced strength of textiles 25 / 50 Noise pollution level in a chemical plant is expressed in ___________? None of these Hertz Roentgen Decibel 26 / 50 Particles having diameter greater than 75 ?m (micrometer = 10-6 mm) are called___________? Smoke Powder Grit Dust 27 / 50 Pick out the correct statement? Noise from ball mills can be dealt with by fibre glass lined enclosures All A., B. & C. Noise of conveyor belt system is reduced by using urethane coated cloth conveyor belts and rubber/plastic covered metallic rollers Noise from vibrating chutes can be reduced by lining the metallic chute with rubber 28 / 50 Particulates (< 1?m size) remaining suspended in air indefinitely and transported by wind currents are called__________? Smoke Mists Aerosols Fumes 29 / 50 Presence of _____ in water stream are deleterious to aquatic life? Suspended solids Heavy metals and cyanides Soluble and toxic organics All A., B. & C. 30 / 50 Noise level in a quiet private business office is about ______ decibels? 25 85 50 70 31 / 50 Pick out the wrong statement? Hydrocarbon pollutants are produced by sweet gum, oak & natural rubber trees Benzopyrene which causes cancer is present in traces in tobacco, charcoal & petrol driven automobile exhaust NO2 is capable of penetrating the troposphere and can absorb both ultraviolet & visible light H2S is not at all produced during combustion of sulphur bearing fuels as all the sulphur is oxidised to SO2 32 / 50 Pick out the wrong statement? Electrostatic precipitator is the most efficient dust collection equipment for removal of submicronic dust particles present in flue gas A slight haze at the top of chimney indicates good combustion in the furnace None of these A bag filter incurs very small pressure drop and is very efficient for removal of submicronic dust particles from flue gases at very high temperature 33 / 50 Methyl isocyanate (MIC) gas (TLV <1 ppm), which caused Bhopal gas tragedy in 1984 falls under the category of _______ toxic gas? Highly Very extremely Moderately Extremely 34 / 50 Noise level audible to audience sitting in the 5th row from the stage during a large orchestra show corresponds to about ________ decibels? 160 135 185 105 35 / 50 Noise level heard at a distance of about 100 metres from a jet engine with after burner is about ______ decibels? 200 170 140 120 36 / 50 Pick out the wrong statement ? Mercury as a pollutant can enter the blood stream & the digestive system/ lungs and is responsible for causing Minamata disease Low ozone layer thickness in polar regions is due to cold climatic conditions Amount of unburnt hydrocarbons emitted by two stroke petrol engine is more as compared to that emitted by a four stroke engine Carbon monoxide present in the two stroke petrol engine exhaust is much less as compared to that emitted from a four stroke engine 37 / 50 Persons working in cement plants and limestone quarries are more prone to disease like___________? Asthma Silicosis Cancer Fluorosis (bone disease) 38 / 50 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? 30 7 3 70 39 / 50 Pick out the one which is not a chemical coagulant ? Chloramine Aluminium sulphate Ferrous sulphate Hydrated lime 40 / 50 Operating principle of cyclone separator is based on the action of ________ dust particles? Diffusion of Gravitational force on Electrostatic force on Centrifugal force on 41 / 50 Maximum allowable concentration of CO2 in air for safe working is ______ ppm (parts per million)? 2000 5000 1000 50 42 / 50 Most of the atmospheric air pollutants are present in large quantity in___________? Stratosphere Mesosphere Thermosphere Troposphere 43 / 50 Noise emitted by a ventilation fan at a distance of 3 metres is about ______ decibels? 145 105 85 125 44 / 50 Presence of ______ bacteria in water causes disease like typhoid? Anaerobic Aerobic Pathogenic Non-pathogenic 45 / 50 Oceans act as sinks for atmospheric gases including carbon dioxide whose concentration in the atmosphere is increased by the________? Green house effect Forestation Rain Vegetation 46 / 50 Phenolic water generated in coke ovens & by-product plant attached to an integrated steel plant containing phenol in concentration of less than 100 mg/litre can be removed by________? None of these Treating in biological oxygen pond Chlorination Chemical coagulation 47 / 50 Pick out the wrong statement ? Troposphere is a dusty zone containing water vapor and clouds Mesosphere is characterised by very low atmospheric pressure and low temperature The concentric atmosphere layer just above troposphere is called stratosphere, which is rich in ozone The radio waves used in the long distance radio communication are reflected back to earth by stratosphere 48 / 50 Main pollutants released from petroleum refineries is___________? CO, SO2 & H2S SO3, NO2 & CO2 CO2, H2S & NO2 CO2, NO & SO3 49 / 50 Pick out the wrong statement? BOD is a measure of the amount of oxygen which will be demanded & used in 5 days by the biological decomposition of the organic matter present in water stream present as food for the living organism BOD is expressed in mg/litre (typically, BOD=2.5 mg/litre for potable water) Biological oxygen demand (BOD) is a characteristic and not a constituent of water None of these 50 / 50 Nitrogen oxides (NOx) is not produced in the _______ industry? Nitrogenous fertiliser Detergent Nitric acid making Any of these Provide Your Information Your score is The average score is 0% LinkedIn Facebook Twitter 0% Restart quiz Send feedback Share on facebook Facebook Share on twitter Twitter Share on whatsapp WhatsApp PrevChemical Environmental Engineering Quiz 2 Chemical Environmental Engineering Quiz 4Next
