Automation System
The two types of relays in a PC are:

None of these
All of these
a control relay and a retentive relay
a retentive relay and a non-retentive relay
an output relay and a control relay

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Automation System
The SKETCHPAD system

consisted of an cathode-ray oscilloscope driven by a Lincoln Tx2 computer where by graphical information was displayed on the screen.
is expensive because it is sophisticated and make demands on the power and resources of the computer.
is used for interactive Graphics
All of these
None of these

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Automation System
Time proportioning control:

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

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