51. 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
52. Growth of __________ is promoted by the presence of manganese in water.
53. The major reason of hydrodynamic noise (i.e., noise resulting from liquid flow) is
54. Pick out the wrong statement.
55. Removal of __________ results from the disinfection of water.
56. Inhalation of lead compounds present in the automobile exhausts (using leaded petrol) causes
57. Polyvinyl chloride containers are not suitable for storing
58. In the context of the chemical process industries, the term BOD is normally associated with the
59. Which of the following is not a weightless pollutant?
60. Thermal pollution of water increases its toxicity and oxidation of oxygen demanding waste besides favouring bacterial growth. A rise in water temperature by 10°C, doubles the toxic effects of __________ present in it.
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