Automation System
Numerical control:

None of these
is a method for producing an exact number of parts per hour
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

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Automation System
Time proportioning control:

cannot use a TM990 micro¬computer
a and b above.
None of these
is less efficient than normal PID control
can be used on a PM550 programmable process controller

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Automation System
Digital signals:

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

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