Control Systems
In signal flow graph output node is node having only------------

 incoming branches
 outgoing branches
None of these
 both 1 and 2

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Control Systems
When deriving the transfer function of linear element

 both initial conditions and loading are taken into account.
 initial conditions are assumed to be zero and the element is assumed to be not loaded.
 initial conditions are taken into account but the element is assumed to be not loaded.
 initial conditions are assumed to be zero but loading is taken into account.

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