Automation System
Digital signals:

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

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Automation System
If the transient response is under damped:

the value of the output will exceed the value of the input at times during the transient period
steady-state will be reached faster than if the system is overdamped
the present overshoot is zero
None of these
both a and b

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Automation System
A sequence controller:

is a mechanical only controller
is no longer in widespread use
is difficult to program
performs on/off control functions in relation to time.
None of these

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