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Environmental Engineering in CE

Environmental Engineering in CE
Tri-sodium phosphate is used in boiler water treatment to reduce

Dissolved oxygen
Caustic embrittlement
Turbidity
Suspended silica

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Environmental Engineering in CE
The weakest sound that can be heard by a person in a quiet environment is equivalent to __________ decibel.

20
5
10
1

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Environmental Engineering in CE
Noise level audible to audience sitting in the 5th row from the stage during a large orchestra show corresponds to about __________ decibels.

105
135
185
160

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Environmental Engineering in CE
Aerodynamic noise resulting from turbulent gas flow is the most prevalent source of valve noise in fluid ilow control. It is caused due to

Neither A nor B
Reynold stresses
Shear forces
Both A & B

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Environmental Engineering in CE
Color test of water is done with an instrument called

Turbidimeter
Tintometer
Colorimeter
Electro-chemical cell

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Environmental Engineering in CE
Workers working in __________ industry are most prone to white lung cancer.

Limestone mining
Coal mining
Asbestos
Textile

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