Control Systems
In polar plots if the critical point '-1+j0' is enclosed then the system is --------

 marginally stable
 critical stable
 unstable
 stable

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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

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

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