Chemical Environmental Engineering | Test For NTS PPSC FPSC, TEST

Pick out the correct statement?

A. Noise from ball mills can be dealt with by fibre glass lined enclosures
B. Noise from vibrating chutes can be reduced by lining the metallic chute with rubber
C. Noise of conveyor belt system is reduced by using urethane coated cloth conveyor belts and
rubber/plastic covered metallic rollers
D. All A., B. & C.

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Category: Chemical Environmental Engineering

Presence of nitrogen in high concentration in contaminated air reduces partial pressure of oxygen in lungs, thereby causing asphyxia (suffocation) leading to death from oxygen deficiency. Concentration of N2 in contaminated air at which it acts as a natural asphyxiate is ≥ _____________ percent?

80% less than 200 mesh size particles are called____________________?

Pick out the correct statement?

Oilish impurities present the effluent discharged from the electroplating industry is normally not removed by _____________________?

‘Safe limit’ called Threshold Limit Value (TLV) of carbon monoxide in atmospheric air is < 50 ppm. The main source of carbon monoxide pollutant in air is the____________________?

CFC (chloro fluoro carbon) is very highly reactive in causing depletion of ozone layer in the atmosphere. Each atom of chlorine liberated from CFC is capable of decomposing ________________ molecules of ozone?

Particles having diameter greater than 75 μm (micrometer = 10-6 mm) are called__________________?

Fresh sewage is ______________ in nature?

Noise produced by cooling fans (employed in air cooled heat exchangers or cooling tower) is mainly caused due to the turbulence created by blade passage through air. It can be reduced by use of a slower fan_________________?

Irradiation of water by ultraviolet light of suitable wavelength is commonly used for disinfection of water in___________________?