Automation System
How is the integral mode implemented using analog methods?

All of these
None of these
Op amp and an RC network to place the error voltage across the capacitor
Op amp and a capacitor
Op amp and resistors

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Automation System
An aneroid barometer

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

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Automation System
A process controller:

can solve a PID process control equation easily
All of these
can interface to digital and analog I/O
None of these
is useful in a continuous process control application

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Automation System
An encoder:

can have only four keys
converts an input to a binary number
None of these
is used to send telegraph signals
converts a binary number to a decimal number.

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