Automation System
Light sensors:

never use infrared light as light source
work in direct sunlight
come in a wide variety of mounting styles
cannot be used a s limit switches.
None of these

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Automation System
A common data base is one requisite for converting CAD and CAM to CIM. Another is that:

there should be a common 3-D part description system.
the system must make provision for new techniques.
None of these
the user must have access to both hardware and software
technical assistance must be provided to the user.

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Automation System
A flip-flop:

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

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