Automation System
A stepping motor;

has a commutator
None of these
has a speed proportional to voltage input
can index positional movement.
is a good choice where continuous rotation is needed

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Automation System
Digital signals:

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

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Automation System
In raster-scan colour monitors, colour can be intensified by:

having each electron gun controlled by separate signal
None of these
using an in-line gun arrangement with a solid metal mesh
having each electron gun controlled by a composite signal
grouping the phosphor dots in a circular pattern

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Automation System
A sequence controller:

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

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