Automation System
A disadvantage of Numerical Control (NC) is:

the tape and tape reader are not reliable
the machine tool can easily overheat
the computer is not reliable
None of these
one operator is needed for each machine.

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Automation System
High-level languages:

require knowledge of the computer design
are "procedure-oriented"
None of these
cannot be used with automatic systems.
are very difficult to use

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Automation System
What is proportional control?

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

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