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

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

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Automation System
A stepping motor;

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

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Automation System
A solenoid:

is spring operated
None of these
can be used only in de circuits
is widely used in industrial automation
is related to an aneroid

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