Automation System
Computer-based controllers:

None of these
(a) and (c) above
are very difficult to change
should be built in a modular fashion wherever possible
are very flexible

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Automation System
An encoder:

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

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Automation System
Semiconductor devices:

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

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