51. The fermentor used for the production of ethyl alcohol from molasses is made of
52. The heat treatment process to which castings and the steel balls produced by cold heading are subjected is
53. The behaviour of visco-elastic material is time dependent. This behaviour is commo in __________ materials.
54. Cast iron compared to steel is better in
55. H2SO4 (< 50% concentration) is corrosive to
56. Constantan is an alloy of
57. Constituents of stellite are
58. Polythene (low or high density) containers are not corroded by
59. An alloy of iron containing 4% carbon is called
60. German silver used for decorative purposes contains maximum percentage of
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