Automation System
The electronic component that has been the key to recent developments in automation is the:

improved vacuum tube
None of these
transistor
diode
integrated circuit

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Automation System
A semi-continuous operation means:

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

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Automation System
Stepping motors:

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

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