Automation System
A dc servo motor:

can provide precise position control
None of these
uses a tachometer for speed feedback
uses a variable dc voltage for speed control
All of these

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Automation System
A sequence controller:

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

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Automation System
Time proportioning control:

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

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