Control Systems
The transfer functions of two compensators are given below. Which one is correct? which one is correct?

  Both C1 and C2 are lead compensator.
  Both C1 and C2 are lag compensator.
  C1 is a lag compensator and C2 i
  C1 is a lead compensator and C2 i

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Control Systems
A cascade of three linear time invariant systems is causal and unstable. From this we conclude that

 at least one system is causal and all systems are unstable.
 at least one system is unstable and at least one system is causal.
 each system in the cascade is individually caused and unstable.
 the majority are unstable and the majority are causal.

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