Automation System
The rectangular boundary around a specific area on the display is called

a view point
a conic section
a view plane
None of these
a window

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Automation System
Time proportioning control:

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

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Automation System
A flip-flop:

None of these
(a) and (c)
is a combinational logic device
is a sequential logic device
remembers what was previously stored in it

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

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

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