Automation System
An encoder:

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

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Automation System
What is the difference between integral and derivative control?

All of these
None of these
integral control has slower response to an error signal.
derivative control does not eliminate offset error
derivative control responds to a change in the rate of change in the error signal

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Automation System
An aneroid barometer

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

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