Automation System
Time proportioning control:

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

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Automation System
Relay ladder logic is used in a PC because:

most industrial control personnel are familiar with relay ladder logic diagrams and this is the easiest for them to use
All of these
it is impossible to write a control program for a machine in any other logic
it is the best industrial control language ever developed.
None of these

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Automation System
What is proportional control?

The gain is independent of offset error.
None of these
The controller output varies continuously over a range
It has a discrete output for each error value
All of these

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