Automation System
The two types of relays in a PC are:

All of these
a retentive relay and a non-retentive relay
a control relay and a retentive relay
None of these
an output relay and a control relay

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Automation System
Speech recognition:

will be used in more applications as the technology matures.
will never be used in industrial controls
is already widely used in industrial controls
All of these
None of these

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Automation System
Digital signals:

are assigned values of 1 or 0 depending on the voltage level
can have three possible levels
have a frequency measured in units of hertz
None of these
have a sinusoidal shape.

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