 
			 
			MCQOPTIONS
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				| 1. | If the plant states are not variable for measurement, then it is possible to construct physical device state observer if : | 
| A. | Produces output at its plant states | 
| B. | Plants equations must satisfy the conditions of observability | 
| C. | Both a and b | 
| D. | Input must be present | 
| Answer» D. Input must be present | |