Automation System
Which of the following method is used the results of a design analysis as a base for redesign decisions?

None of these
All of these
The design selection method
The direct method
The iterative design method

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Automation System
Relay ladder logic is used in a PC because:

All of these
it is the best industrial control language ever developed.
None of these
it is impossible to write a control program for a machine in any other logic
most industrial control personnel are familiar with relay ladder logic diagrams and this is the easiest for them to use

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Automation System
A flip-flop:

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

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Automation System
A semi-continuous operation means:

each operation in a sequence is continuous, but subsequent operations in the sequence may be different.
coffee breaks are allowed for the operator
None of these
a computer is a required part of the machine
the operation is continuous each shift, but stops between shifts

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Automation System
Semiconductor devices:

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

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