Environmental Engineering in CE
High noise levels produced during operation of fans and compressors can be reduced by using

Accoustical absorbent
None of these
Lagging of noisy duct
Mufflers (silencers)

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Environmental Engineering in CE
Higher concentration of CO₂ in atmosphere

Prevents solar heat being radiated out completely, resulting in
Reflects and absorbs the longer wavelength (infra-red) radiations
Allows visible solar radiation (ultraviolet) of short wave-length to pass through
All of these

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