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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