High noise level in a chemical plant can be controlled by the_________________?

Related Mcqs:

Green house gases blanket/block the infrared radiation from earth’s surface to the atmosphere leading to its progressive warming up. Which of the following gases does not exhibit green house effect ?

A. CO2 B. H2 C. SO3 D. N2...

Corrosion in boilers can be prevented by _________________?

A. Deaeration of feed water B. Enhancing pH of feed water by adding alkali C. Feeding sodium sulphite or hydrazine phosphate to the boilers, which combines with oxygen and prevents corrosion D. All A., B. and C....

The major reason of hydrodynamic noise (i.e., noise resulting from liquid flow) is_________________?

A. Pipe vibrations B. Cavitation C. Boundary layer separation D. Fluctuation in liquid flow...

Radioactive substances present in the polluted water stream can be removed by_________________?

A. Biological oxygen treatment B. Coagulation and filtration C. Adsorption in ion exchange materials D. None of these...

Maximum permissible residual chlorine in treated water should be ____________ mg/litre?

A. 0.001 to 0.01 B. 0.2 to 0.3 C. 2 to 3 D. 5 to 10...