Automation System
Digital signals:

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

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Automation System
An encoder:

converts an input to a binary number
is used to send telegraph signals
None of these
converts a binary number to a decimal number.
can have only four keys

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Automation System
Stepping motors:

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

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Automation System
A semi-continuous operation means:

each operation in a sequence is continuous, but subsequent operations in the sequence may be different.
None of these
coffee breaks are allowed for the operator
the operation is continuous each shift, but stops between shifts
a computer is a required part of the machine

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