Automation System
Historically, central systems were used because:

None of these
memory consumed a large amount of power
memory was very expensive
All of these
semiconductor memory was not available

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Automation System
A semi-continuous operation means:

a computer is a required part of the machine
None of these
coffee breaks are allowed for the operator
the operation is continuous each shift, but stops between shifts
each operation in a sequence is continuous, but subsequent operations in the sequence may be different.

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Automation System
An aneroid barometer

can measure only atmospheric pressure
is very unreliable
can be used to measure gas or liquid flow rates
None of these
measures pressure by sensing deflection of an evacuated chambers.

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