66.
Which of the following material has nearly zero coefficient of expansion?

67.
When filing or machining cast iron makes our hands black, then it shows that ________ is present in cast iron.

68.
When medium carbon steel is heated to coarsening temperature

69.
Which of the following when used in ordinary low carbon steels, makes the metal ductile and of good bending qualities?

70.
Recrystallization temperature is one

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