Automation System
An operational amplifier:

can be used to subtract two or more signals
uses the principle of feedback
All of these
None of these
can be used to sum two or more signals

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Automation System
If the transient response of a system is overdamped:

None of these
the value of the output never exceeds the value of the input during the transient period.
the value of the output never stabilizes.
the value of the output exceeds the value of the input at times during the transient period.
All of these

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Automation System
Stepping motors:

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

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