Control Systems
The impulse response of a system is c(t) = -te-t + 2 e-t (t>0). Its closed loop transfer function is

 (2s+1)/(s+1)²
 (2s+2)/s²
 (2s+2)/(s+1)²
 (2s+1)/s²

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Control Systems
An open loop control system, represented by the transfer function G ( s ) = ( s - 1 ) / ( s + 2 )( s + 3 ), is

  unstable and of the non minimum phase type .
  unstable and of the minimum phase type.
  stable and of the minimum phase type.
  stable and of the non-minimum phase type.

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