Automation System
Many things can be done to minimize downtime loss. Identify two of them.

establish a user forum program
provide an extra workstation
None of these
stock critical spare parts
both b and c

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Automation System
Time proportioning control:

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

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