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				| 1. | Which of the following types of mould will have longest period of cooling time for the same castings? | 
| A. | Green sand mould of simple shape and size | 
| B. | Dry sand mould of simple shape and size | 
| C. | Dry sand mould of complex shape and size | 
| D. | Green sand mould of complex shape and size | 
| Answer» D. Green sand mould of complex shape and size | |