131. Which is a neutral refractory?
132. Which is an acidic refractory?
133. Ferromagnetic ceramic material is not used in the
134. Electrical resistor bars are made of
135. Chrome magnesite brick is not used for lining the
136. silicon carbide refractories have very low
137. Fusion temperature of pure silica (SiO2) is __________ °C.
138. Spray test determines the __________ of refractories.
139. The main raw material for manufacture of silicon carbide refractories is
140. Which of the following consumes the maximum tonnage of refractories annually in an integrated steel plant?
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