Automation System
Three different aspects of colour are used to define specific colours. They are hue, saturation, and:

shading
None of these
gray scale
value
metamer

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Automation System
An aneroid barometer

None of these
is very unreliable
can be used to measure gas or liquid flow rates
can measure only atmospheric pressure
measures pressure by sensing deflection of an evacuated chambers.

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Automation System
The program counter:

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

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