Automation System
When a computer fetches an instruction, the binary code representing the instruction appears on the:

None of these
I/O address bus
output data bus
memory data bus
input data bus

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Automation System
Programmable controllers:

(a) and (c) above
are programmed using relay ladder logic
None of these
cannot perform functions other than relay logic
are widely used in many different industries

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Automation System
Light sensors:

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

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