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Environmental Engineering in CE

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

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

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Environmental Engineering in CE
Which of the following is the most detrimental for water used in high pressure boiler?

Silica
Dissolved oxygen
Phenol
Turbidity

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Environmental Engineering in CE
Particles having diameter greater than 75 μm (micrometer = 10-6 mm) are called

Smoke
Dust
Grit
Powder

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Environmental Engineering in CE
Scale formation in boiler is controlled by

Eliminating H₂S in feed water
Reduction in hardness, silica & alumina in feed water
Keeping the pH value of feed water just below 7
Preheating of feed water

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Environmental Engineering in CE
Which of the following pollutants, if present in atmosphere is detectable by its odour?

CO
CO₂
NO₂
SO₂

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

2000
50
5000
5

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