Automation System
A favourable reason for automation is to:

perform difficult operations
raises assembly cost
decrease throughput
increase number of operations
None of these

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Automation System
The main function(s) of computer in CAD is/are

To relieve the designer from routine repetitious tasks.
None of these
To enhance the analytical and logical power of the designer
All of these
To serve as an extension to the memory of the designer

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Automation System
Digital signals:

can have three possible levels
are assigned values of 1 or 0 depending on the voltage level
have a sinusoidal shape.
have a frequency measured in units of hertz
None of these

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

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

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