GATE EC 2014 Set 1 — Question 56
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Control Systems → State-Space Analysis → Controllability & Observability
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Question
Consider the state space model of a system, as given belowThe system is
Correct answer
(B) uncontrollable and observable
Solution
The state space model is given by and , where:
, , 1. Controllability:
The controllability matrix is .
Since the third row is all zeros, . The rank of is 2, which is less than the system order (3). Thus, the system is uncontrollable.2. Observability:
The observability matrix is .
.
Since , the rank is 3. Thus, the system is observable.Therefore, the system is uncontrollable and observable.
, , 1. Controllability:
The controllability matrix is .
Since the third row is all zeros, . The rank of is 2, which is less than the system order (3). Thus, the system is uncontrollable.2. Observability:
The observability matrix is .
.
Since , the rank is 3. Thus, the system is observable.Therefore, the system is uncontrollable and observable.
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