Automation System
A venturi tube:

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

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Automation System
Stepping motors:

can run at varying speeds
do not require commutators
All of these
can run both clockwise and counterclockwise
can be built to index different amounts by changing the pole configuration

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Automation System
Programmable controllers:

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

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