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3263. A good metallurgical coke

Should have high porosity
Should be brittle
Must contain moderate quantities of ash, moisture, sulphur and volatile matters
Should have low fusion point of its ash
✅ The correct answer is option A.

3268. Chromite refractories

are bonded with lime and clay.
(free from silica) have better thermal fatigue resistance than silica and magnesite refractories.
are resistant to basic slag.
all (a), (b) and (c).
✅ The correct answer is option D.

3277. Ramming masses are used for

obtaining monolithic working faces.
repairing construction of various furnace parts.
both (a) & (b).
neither (a) nor (b).
✅ The correct answer is option C.