Automation System
How is the integral mode implemented using analog methods?

Op amp and an RC network to place the error voltage across the capacitor
Op amp and resistors
All of these
None of these
Op amp and a capacitor

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Automation System
Time proportioning control:

None of these
a and b above.
cannot use a TM990 micro¬computer
is less efficient than normal PID control
can be used on a PM550 programmable process controller

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