81. Ceramic recuperators are generally made of
82. 'Hypersil' is a __________ steel.
83. Perspex is nothing but
84. Phenol is not shipped in
85. Pick out the wrong statement.
86. Plastics are
87. Invar used in thermocouples is an alloy of nickel and
88. Liquid ammonia is shipped in __________ containers.
89. Which of the following is not a copper based alloy with nickel?
90. The presence of impurities in iron
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