31. Which is a neutral refractory?
32. Which is an acidic refractory?
33. Ferromagnetic ceramic material is not used in the
34. Electrical resistor bars are made of
35. Chrome magnesite brick is not used for lining the
36. silicon carbide refractories have very low
37. Fusion temperature of pure silica (SiO2) is __________ °C.
38. Spray test determines the __________ of refractories.
39. The main raw material for manufacture of silicon carbide refractories is
40. Which of the following consumes the maximum tonnage of refractories annually in an integrated steel plant?
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