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

metamer
gray scale
None of these
value
shading

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Automation System
Today, programmable controllers:

can be cost effective even when replacing just a few relays
are more powerful then the first controllers on the market
None of these
are relatively low cost compared with the original digital equipment available for industrial control
All of these

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Automation System
A venturi tube:

None of these
is made only of metal
can be used to measure gas or liquid flow rates
measures the presence of a liquid
is extremely difficult to use

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Automation System
D/A (digital to analog) conversion:

results in a binary code as the final output
None of these
has to be sampled at 1/2 the highest input frequency
both (b) and (c)
must be fed through a filter to reproduce the original signal accurately

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