Control Systems
Time response for a second order system depends on the value of τ. If τ= 0 then the system is called as

  under damped system.
  over damped system.
  undamped system.
  critically damped system.

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

 the majority are unstable and the majority are causal.
 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.

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