Chemical Environmental Engineering Quiz 3
1 / 50
Most of the atmospheric air pollutants are present in large quantity in___________?
2 / 50
Maximum permissible concentration (i.e. TLV) of DDT in public water supply system is ________ micro gram (? g)/litre?
3 / 50
Noise pollution level in a chemical plant is expressed in ___________?
4 / 50
Noise level inside a jet airliner in normal flight is about _______ decibels?
5 / 50
Phenolic water generated in coke ovens & by-product plant of a steel plant are disposed off by__________?
6 / 50
Pick out the wrong statement?
7 / 50
Particles having diameter greater than 75 ?m (micrometer = 10-6 mm) are called___________?
8 / 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?
9 / 50
Presence of _____ in water stream are deleterious to aquatic life?
10 / 50
Particulates (< 1?m size) remaining suspended in air indefinitely and transported by wind currents are called__________?
11 / 50
Pick out the wrong statement ?
12 / 50
Oceans act as sinks for atmospheric gases including carbon dioxide whose concentration in the atmosphere is increased by the________?
13 / 50
Pick out the correct statement ?
14 / 50
Persons working in cement plants and limestone quarries are more prone to disease like___________?
15 / 50
Presence of ______ bacteria in water causes disease like typhoid?
16 / 50
Noise emitted by a ventilation fan at a distance of 3 metres is about ______ decibels?
17 / 50
Methyl isocyanate (MIC) gas (TLV <1 ppm), which caused Bhopal gas tragedy in 1984 falls under the category of _______ toxic gas?
18 / 50
Noise level during normal conversation among men is about _______ decibels?
19 / 50
Main pollutants released from iron & steel industry is___________?
20 / 50
Maximum allowable concentration of CO2 in air for safe working is ______ ppm (parts per million)?
21 / 50
Pick out the correct statement?
22 / 50
Operating principle of cyclone separator is based on the action of ________ dust particles?
23 / 50
Oilish impurities present the effluent discharged from the electroplating industry is normally not removed by _______?
24 / 50
Noise level heard at a distance of about 100 metres from a jet engine with after burner is about ______ decibels?
25 / 50
Pick out the one which is not a chemical coagulant ?
26 / 50
Nitrogen oxides (NOx) is not produced in the _______ industry?
27 / 50
28 / 50
Out of the following, TLV of ________ is maximum (about 500 ppm)?
29 / 50
30 / 50
Maximum permissible residual chlorine in treated water should be _____ mg/litre?
31 / 50
32 / 50
Moist atmospheric air at high temperature (e.g., in summer) having high concentration of sulphur dioxide causes_________?
33 / 50
34 / 50
Maximum allowable noise exposure limits for a man working for 8 hours a day in a noisy chemical plant is about _______ decibels?
35 / 50
Photochemical smog is formed from automobile exhaust _________?
36 / 50
Pollution by particulate matter emission in the atmosphere does not take place during metal______?
37 / 50
Maximum permissible turbidity in potable water is ______ ppm?
38 / 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__________?
39 / 50
Permissible safe limit (TLV) of ______ toxic gas is 100-1000 parts per million (ppm)?
40 / 50
Noise level audible to audience sitting in the 5th row from the stage during a large orchestra show corresponds to about ________ decibels?
41 / 50
Ozone is___________?
42 / 50
Noise level in a quiet private business office is about ______ decibels?
43 / 50
On prolonged exposure to high concentration of carbon monoxide (> 5000 ppm), man dies because ___________?
44 / 50
45 / 50
Peroxyacetyl nitrate (PAN), a pollutant is found in the__________?
46 / 50
Main pollutants released from petroleum refineries is___________?
47 / 50
Noise level heard inside a bus in busy city traffic or inside a sub-way train corresponds to about _______ decibels?
48 / 50
Maximum permissible limit of industrial noise as recommended by World Health Organisation (WHO) is ______ decibels?
49 / 50
Polyvinyl chloride containers are not suitable for storing__________?
50 / 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________?
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