Automation System
Programmable controllers:

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

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Automation System
Semiconductor devices:

None of these
usually have a very short MTBF (mean time between failure)
are less reliable than electro¬mechanical components
have a very short infant mortality period
All of these

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Automation System
What is the process lag?

None of these
The time it takes for the sensor to respond to a changed.
The lag in the error signal when the setpoint is changed.
All of these
The time it takes for the mass of the process to respond to an input change.

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