Automation System
The two types of relays in a PC are:

an output relay and a control relay
a control relay and a retentive relay
All of these
None of these
a retentive relay and a non-retentive relay

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Automation System
A flip-flop:

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

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