Automation System
A venturi tube:

measures the presence of a liquid
None of these
is made only of metal
can be used to measure gas or liquid flow rates
is extremely difficult to use

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

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

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Automation System
Today, programmable controllers:

All of these
can be cost effective even when replacing just a few relays
are relatively low cost compared with the original digital equipment available for industrial control
None of these
are more powerful then the first controllers on the market

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Automation System
The program counter:

decides which program to run
counts the number of instructions that have been executed
None of these
contains the address of the next instruction to be executed
is where arithmetic is done in a computer.

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