71. The charge of the blast furnace consists of
72. Pearlite consists of
73. Balls for ball bearings are made of
74. The property of a material essential for spring materials is
75. Grey cast iron has
76. In which of the following cases, consideration of creep is important
77. Iron-carbon alloys containing 1.7 to 4.3% carbon are known as
78. Pipes for bicycle frames are made of
79. Which of the following metal is used for nuclear energy?
80. Aluminium bronze contains aluminium and copper in the ratio of
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