After how many heats, should the refractory lining be renewed?(a) 50-100(b) 100-200(c) 200-300(d) 300-400The question was posed to me by my school teacher while I was bunking the class.Origin of the question is Rotory Melting Furnace in chapter Metal Furnace and Practice of Casting-Forming-Welding II

After how many heats, should the refractory lining be renewed?(a) 50-1

1.	After how many heats, should the refractory lining be renewed?(a) 50-100(b) 100-200(c) 200-300(d) 300-400The question was posed to me by my school teacher while I was bunking the class.Origin of the question is Rotory Melting Furnace in chapter Metal Furnace and Practice of Casting-Forming-Welding II
Answer» Right option is (c) 200-300 Easy EXPLANATION: The refractory lining must be renewed, as the constant HEATING processes MAY cause it to DAMAGE. After approximately, 200 to 300 heats, the refractory lining should be renewed for a smooth operation.

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