Automation System
Most continuous control actuators:

are of the time proportioning type
use a 4 to 20 mA current loop input
(b) and (c) above
None of these
are used with standard continuous control loop

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Automation System
If the transient response is under damped:

both a and b
None of these
the present overshoot is zero
steady-state will be reached faster than if the system is overdamped
the value of the output will exceed the value of the input at times during the transient period

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Automation System
Today, programmable controllers:

are relatively low cost compared with the original digital equipment available for industrial control
are more powerful then the first controllers on the market
None of these
All of these
can be cost effective even when replacing just a few relays

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