Control Systems
The transfer function of phase lead compensator is given by , where, T > 0, α < 0. What is the maximum phase shift provided by this compensator?

 both 1 and 3
 tan-1((1 - α)/(2√α)
 sin-1((1 - α)/(1 + α)
 cos-1((1 - α)/(1 + α)

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

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