Automation System
Most continuous control actuators:

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

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Automation System
Semiconductor devices:

are less reliable than electro¬mechanical components
usually have a very short MTBF (mean time between failure)
None of these
All of these
have a very short infant mortality period

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Automation System
The program execution time:

All of these
cannot be changed once the program is written
None of these
must be slower than the fastest mechanical operation that is to be controlled
will vary depending on the language used

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