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				| 1. | A conical spring is to be designed with base diameter 100 mm and another end diameter 50 mm and pitch of spring is 5 mm to a height of 80 mm. How many revolutions are there in spring? | 
| A. | 15 | 
| B. | 16 | 
| C. | 17 | 
| D. | 18 | 
| Answer» C. 17 | |