When writing a transfer function which of the following loops are not valid loops

Electrical Engineering XYZ MCQs

When writing a transfer function which of the following loops are not valid loops:

1. Self loops at output node
2. Self loops at input node
3. Both of the above
4. None of the above

Correct answer: 2. Self loops at input node

Explanation: A self loop at the input node implies that the input is being fed back directly to itself. This can also lead to instability or undesired behavior in the system.