51. Lead pipes are not safe for carrying drinking water because water containing dissolved oxygen attacks lead thereby forming poisonous Pb(OH)2. Lead pipes are readily corroded by
52. Lead pipes are not safe for carraying drinking water, because water, containing dissolved oxygen attacks lead thereby forming poisonous Pb(OH)2. Lead pipes are readily corroded by
53. To improve the machinability of steel by its softening, it is subjected to
54. Which of the following is the most widely used insulating material for steam carray-ing pipelines?
55. 18/8 stainless steel means, that it contains
56. Lead alone is not used in storing equipment, because it
57. Tubes of multiple effect evaporator used for concentration of sugar cane juice are made of
58. High speed steel tools retain their hardness upto a temperature of __________ °C.
59. The material of construction of pressure mills used for squeezing out the juice from sugar cane is
60. Which of the following has the least carbon percentage?
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