Control Systems
Which of the following statements is/are true?

 both 1 and 2
 Centroid may not be a part of root locus
 nether 1 nor 2
 Centroid may be a part of root locus

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

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