Automation System
Productivity is defined as:

cost per unit
number of items manufactured per day
cost per day
None of these
output per man-hour of labour

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

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

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Automation System
Programmable controllers:

None of these
cannot perform functions other than relay logic
are programmed using relay ladder logic
(a) and (c) above
are widely used in many different industries

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Automation System
Microcomputer-based control sys-tems

will have more standard industrial application software available in the future.
All of these
None of these
will tend to increase in cost.
will just keep their present capability

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