Control Systems
The transfer function of a plant is T(s) = 5/(s+5)(s² + 5 + 1). The second order approximation of T(s) using dominant pole concept is

 5/(s+1)(s+5)
 5/(s² + 5 + 1)
 1/(s² + 5 + 1)
 1/(s+1)(s+5)

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

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