Question: 1) Simplify the above block diagram and determine the closed-loop transfer function. ( Hints : Join summing junction 2 and 3, then simplify the block

1) Simplify the above block diagram and determine the closed-loop transfer function. (Hints: Join summing junction 2 and 3, then simplify the block diagram using parallel, cascade and feedback connections)
2) If given transfer function
,
using Routh- Hurwitz criterion, find the range of K that will make this unit feedback system
critically stable.
H,(s) R(s)+
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