Automation System
Light sensors:

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

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Automation System
Digital signals:

have a frequency measured in units of hertz
have a sinusoidal shape.
can have three possible levels
None of these
are assigned values of 1 or 0 depending on the voltage level

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Automation System
The program counter:

is where arithmetic is done in a computer.
decides which program to run
contains the address of the next instruction to be executed
None of these
counts the number of instructions that have been executed

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