Major sources of noise in furnace operation arises from air inspirators, combustion, side wall vibrations and fluctuation in the process heat load. A 50% increase in fuel firing rate may increase the furnace noise level by about __________ decibels.

Environmental Engineering in CE
Major sources of noise in furnace operation arises from air inspirators, combustion, side wall vibrations and fluctuation in the process heat load. A 50% increase in fuel firing rate may increase the furnace noise level by about __________ decibels.

70

3

100

30

70

3

100

30

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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

Both A & B

Shear forces

Reynold stresses

Neither A nor B

Both A & B

Shear forces

Reynold stresses

Neither A nor B

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Environmental Engineering in CE
Higher concentration of CO₂ in atmosphere

All of these

Allows visible solar radiation (ultraviolet) of short wave-length to pass through

Prevents solar heat being radiated out completely, resulting in

Reflects and absorbs the longer wavelength (infra-red) radiations

All of these

Allows visible solar radiation (ultraviolet) of short wave-length to pass through

Prevents solar heat being radiated out completely, resulting in

Reflects and absorbs the longer wavelength (infra-red) radiations

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Environmental Engineering in CE
Fresh sewage is __________ in nature.

Neutral

Acidic

Highly acidic

Alkaline

Neutral

Acidic

Highly acidic

Alkaline

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Environmental Engineering in CE
Foaming and priming in boiler operation can be reduced by reduction in __________ in feed water.

All of these

Total solids

Color (Hazen)

Turbidity

All of these

Total solids

Color (Hazen)

Turbidity

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Environmental Engineering in CE
In sewage treatment, its sedimentation is speeded up by commonly adding

Lime

Copper sulphate

Hydrochloric acid

Sodium sulphate

Lime

Copper sulphate

Hydrochloric acid

Sodium sulphate

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Environmental Engineering in CE

Environmental Engineering in CE Major sources of noise in furnace operation arises from air inspirators, combustion, side wall vibrations and fluctuation in the process heat load. A 50% increase in fuel firing rate may increase the furnace noise level by about __________ decibels.

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

Environmental Engineering in CE Higher concentration of CO₂ in atmosphere

Environmental Engineering in CE Fresh sewage is __________ in nature.

Environmental Engineering in CE Foaming and priming in boiler operation can be reduced by reduction in __________ in feed water.

Environmental Engineering in CE In sewage treatment, its sedimentation is speeded up by commonly adding

Environmental Engineering in CE
Major sources of noise in furnace operation arises from air inspirators, combustion, side wall vibrations and fluctuation in the process heat load. A 50% increase in fuel firing rate may increase the furnace noise level by about __________ decibels.

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

Environmental Engineering in CE
Higher concentration of CO₂ in atmosphere

Environmental Engineering in CE
Fresh sewage is __________ in nature.

Environmental Engineering in CE
Foaming and priming in boiler operation can be reduced by reduction in __________ in feed water.

Environmental Engineering in CE
In sewage treatment, its sedimentation is speeded up by commonly adding