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Environmental Engineering in CE

Environmental Engineering in CE
Which of the following gases is having the widest explosion limit (about 2 to 81% gas in gas-air mixture), rendering it the property of the most explosive gas?

Hydrogen
Carbon monoxide
Acetylene
Ammonia

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Environmental Engineering in CE
Ionisation potential employed in the industrial electrostatic precipitator is of the order of

30 to 70 kV AC
230 V AC
30 to 70 kV DC
230 V DC

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Environmental Engineering in CE
Oilish impurities present the effluent discharged from the electroplating industry is normally not removed by

Floatation & skimming
Chemical coagulation
Centrifugation
Ultrafiltration

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Environmental Engineering in CE
Death may occur, when SO₂ concentration in atmospheric air exceeds __________ ppm.

200
20
100
400

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Environmental Engineering in CE
Threshold limit value (TLV) of CO in air is __________ ppm.

50
2000
5
5000

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Environmental Engineering in CE
Which of the following is the most lethal water pollutant?

Suspended solids
Phenol and cynide
Alkalis
Chlorine

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