IRON AND IRON MOLDING 



10. Explain the chemistry of the blast furnace. 



11. What is the difference between pig iron and cast iron? 



12. How are varieties of cast iron known? 



13. What is a foundry? 



14. What is a cupola? 



15. Explain why it is necessary to clean a casting. 



16. Describe the molding of a casting. 



17. What is molding sand? 



18. Name the different kinds of molding. 



19. State some of the disadvantages of the molding trade. 



20. Explain brass molding. 



21. State advantages and disadvantages of cast iron. 



