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