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