Question: A controller is used to regulate the temperature of a mold for plastic part fabrication. The value of the delay time is estimated at 1.2

A controller is used to regulate the temperature of a mold for plastic part fabrication. The value of the delay time is estimated at 1.2 s. (a) Using the Nyquist criterion, determine the stability of the system for Ka = K = 1.
(b) Determine a suitable value for Ka for a stable system that will yield a phase margin greater than 50° when K= 1

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