Automation System
Timing using a TM990 micro-computer:

require an external timer added by the user
None of these
can be handled in software
both (b) and (c)
is available on the standard CPU board

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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
Stepping motors:

can run at varying speeds
can be built to index different amounts by changing the pole configuration
do not require commutators
can run both clockwise and counterclockwise
All of these

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