Automation System
Which of the following is often used as an alternative to the light pen or in association with storage tube displays?

Tablet
Digitiser
None of these
Track ball
Mouse

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

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

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Automation System
Programmable controllers:

are widely used in many different industries
cannot perform functions other than relay logic
(a) and (c) above
None of these
are programmed using relay ladder logic

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Automation System
High-level languages:

are "procedure-oriented"
require knowledge of the computer design
are very difficult to use
None of these
cannot be used with automatic systems.

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