Automation System
The reliability life cycle of a product:

None of these
cannot be predicted
has three distinct rates of failure
All of these
stays constant with environmental conditions

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Automation System
A solenoid:

is spring operated
is widely used in industrial automation
None of these
can be used only in de circuits
is related to an aneroid

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Automation System
An aneroid barometer

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

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Automation System
Stepping motors:

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

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Automation System
Relay ladder logic is used in a PC because:

None of these
it is impossible to write a control program for a machine in any other logic
All of these
most industrial control personnel are familiar with relay ladder logic diagrams and this is the easiest for them to use
it is the best industrial control language ever developed.

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