Automation System
A drum timer is a good example of:

a position sensor
None of these
an input sensor
an output actuator
a sequence controller

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Automation System
Time proportioning control:

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

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Automation System
Today, programmable controllers:

None of these
are relatively low cost compared with the original digital equipment available for industrial control
are more powerful then the first controllers on the market
All of these
can be cost effective even when replacing just a few relays

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