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

 Self loops at output node.
 Neither 1 nor 2.
 Self loops at input node.
 Both 1 and 2.

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Control Systems
What is the full form of SPICE ?

 None of these.
 Sequential program with integrated circuit analysis.
  Simulated program with integrated circuit analysis.
 Stimulated program with integrated circuit arrangement.

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