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

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

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Automation System
Digital signals:

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

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Automation System
Numerical control:

None of these
All of these
applies only to milling machines
is a method for controlling the operation of a machine by means of a set of instructions
is a method for producing an exact number of parts per hour

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