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
Both A & B
Shear forces
Reynold stresses

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Environmental Engineering in CE
Smoke is produced due to

Poor quality of fuel and improper mixing of fuel & combustion air
Poor design & overloading of furnace
Insufficient supply of combustion air and insufficient time for combustion
All of these

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