Control Systems
A system has poles at 0.01 Hz, 1 Hz and 80 Hz; zeros at 5 Hz, 100 Hz and 200 Hz. The approximate phase of the system response at 20 Hz is

 -180°
 180°
 -90°
 90°

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

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