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				| 1. | What is the condition for maximum velocity in case of most economical circular section? | 
| A. | sin u2061 2 =2 | 
| B. | cos u2061 2 =2 | 
| C. | tan u2061 2 =2 | 
| D. | sec u2061 2 =2 | 
| Answer» D. sec u2061 2 =2 | |