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

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

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Environmental Engineering in CE
Bag filter design is predominantly dependent on gas temperature, as it affects the gas density & viscosity and the selection of filtering material. The pressure drop in a bag filter is

Proportional to the viscosity & density of the gas
Both B and C
Proportional to the pressure of the gas
Inversely proportional to viscosity of gas

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