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
None of these
All of these
a retentive relay and a non-retentive relay

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Automation System
Semiconductor devices:

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

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