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				| 1. | A control system whose step response is -0.5(1+e-2t) is cascaded to another control block whose impulse response is e-t. What is the transfer function of the cascaded combination? | 
| A. | 1/(s+2)(s+1) | 
| B. | 1/(s+1)s | 
| C. | 1/(s+3) | 
| D. | 0.5/(s+1)(s+2) | 
| Answer» B. 1/(s+1)s | |