Automation System
An encoder:

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

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Automation System
The program counter:

decides which program to run
is where arithmetic is done in a computer.
counts the number of instructions that have been executed
None of these
contains the address of the next instruction to be executed

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Automation System
Semiconductor devices:

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

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