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Environmental Engineering in CE

Environmental Engineering in CE
Noise emitted by a ventilation fan at a distance of 3 metres is about __________ decibels.

85
105
125
145

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Environmental Engineering in CE
Insufficient washing of sand grains in a rapid sand filter causes

Mud balls
Air binding
Expansion of filtering media
Shrinkage of filtering media

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Environmental Engineering in CE
Thermal pollution due to excessive heat & temperature in the working place causes

Reduction in working efficiency of manpower
Fatigue
High breathing rate
All of these

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Environmental Engineering in CE
The progressive warming up of the earth's surface is mainly due to the

Blanketing effect of CO₂ in the atmosphere
Automobile exhaust
De-forestation
Thickening of ozone layer

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Environmental Engineering in CE
Which of the following is an adsorbant for removal of nitrogen oxides from gas/air?

Silica gel
Bog iron (iron oxide)
Pulverised limestone
Active carbon

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Environmental Engineering in CE
Inhalation of silica dust by human being during hand drilling in mica mining, lead & zinc mining, silica refractory manufacture and in foundaries causes

All of these
Tuberculosis
Asphyxiation (suffocation)
Shortness of breath

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