Automation System
A semi-continuous operation means:

the operation is continuous each shift, but stops between shifts
None of these
coffee breaks are allowed for the operator
a computer is a required part of the machine
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
None of these
measures pressure by sensing deflection of an evacuated chambers.
can be used to measure gas or liquid flow rates

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Automation System
Time proportioning control:

None of these
cannot use a TM990 micro¬computer
a and b above.
is less efficient than normal PID control
can be used on a PM550 programmable process controller

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