Automation System
Most continuous control actuators:

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

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Automation System
What is the difference between integral and derivative control?

All of these
integral control has slower response to an error signal.
derivative control does not eliminate offset error
None of these
derivative control responds to a change in the rate of change in the error signal

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Automation System
A stepping motor;

None of these
has a commutator
is a good choice where continuous rotation is needed
has a speed proportional to voltage input
can index positional movement.

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