Automation System
Programmable controllers:

None of these
are programmed using relay ladder logic
are widely used in many different industries
(a) and (c) above
cannot perform functions other than relay logic

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Automation System
Trend analysis:

requires a very expensive system to implement
is used only in financial planning
None of these
can improve control system response
is a brand new concept

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Automation System
D/A (digital to analog) conversion:

has to be sampled at 1/2 the highest input frequency
None of these
must be fed through a filter to reproduce the original signal accurately
both (b) and (c)
results in a binary code as the final output

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