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

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

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Automation System
Light sensors:

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

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Automation System
A flip-flop:

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

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