Automation System
A flip-flop:

is a combinational logic device
is a sequential logic device
(a) and (c)
None of these
remembers what was previously stored in it

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Automation System
How is the integral mode implemented on a digital controller?

None of these
the error is divided into discrete amounts
All of these
the error signal is summed over a discrete time interval and accumulated by the controller
the digital controller cannot handle integral mode

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Automation System
Programmable controllers:

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

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