Discussion
Loop which do not possess any common node are said to be :
Answer: C
Loops with no common node are non-touching loops.
In a signal flow graph, two loops are non-touching if they share no node. Mason's gain formula needs them: the determinant subtracts the individual loop gains and adds the products of gains of pairs of non-touching loops, then subtracts triples, and so on.
Touching loops are those that share at least one node. Forward paths run from input to output and are not loops, and 'feedback gain loops' is not the term for loops without common nodes.
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