8) Give specific answer to the following

i) Differentiate between pig iron, cast iron and steel

ii) Why big ingots with circular cross section are not cast?

iii) What is the current level of steel production in India

iv) Name the integrated steel plants in India in public sector

v) Name five mini steel plants in India

vi) Why are Laval nozzles used in steelmaking/

vii) What are the functions of argon gas in R-H degassing process

viii) Is electric steelmaking autogeneous? Explain in brief

ix) What are conditions of producing rimming steel ingots

x) Give parameters to judge quality of sponge iron for its usage in electric steelmaking

xi) How does preheating of scrap decrease electric consumption in electric steelmaking

xii) Why is it necessary to inject carbon in electric steelmaking?

xiii) What are the future prospects of steel industry in India?

xiv) What is the cause of Mn reversion in LD steelmaking

xv) Why is it necessary to modify alumina inclusions in steel?

xvi) Is excessive addition of aluminium for deoxidation of steel harmful from metallurgical point of view?

xvii) What is steelmaking

xviii) What is the mechanism of decrease in viscosity of pure liquid silica on addition of CaO

xix) Define basicity of slag from ionic slag model

xx) Why is it necessary to have excess lime in slag in converter steelmaking?

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