Automation System
An encoder:

converts an input to a binary number
None of these
converts a binary number to a decimal number.
can have only four keys
is used to send telegraph signals

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Automation System
Programmable controllers:

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

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

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

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Automation System
What is proportional control?

It has a discrete output for each error value
All of these
The controller output varies continuously over a range
None of these
The gain is independent of offset error.

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