Automation System
A dc servo motor:

All of these
uses a tachometer for speed feedback
None of these
can provide precise position control
uses a variable dc voltage for speed control

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Automation System
The computer graphics system called SKETCHPAD was demonstrated at

Imperial college of Science and Technology, London, 1973
Cranfield Institute of Technology, London, 1962
Massachusetts Institute of Technology in 1963
None of these
University of Aston, Birmingham, 1960

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Automation System
Most industrial control applications:

can be done more reliably using solid-state methods
can be solved using more than one method of control
must have the process specified correctly to be successful
None of these
All of these

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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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