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