81. Which of the following metal is used in making electrical resistance wire for electric furnaces and heating elements?
82. In the lower part of the blast furnace (zone of fusion), the temperature is
83. The heat treatment process used for softening hardened steel is
84. Which of the following impurity in cast iron makes it hard and brittle?
85. An engineer's hammer is made of
86. The alloying element which can replace tungsten in high speed steels is
87. Grey cast iron
88. Which of the following element results in presence of free graphite in C.I.?
89. The percentage carbon content in wrought iron is about
90. Age-hardening is related with
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