Automation System
D/A (digital to analog) conversion:

has to be sampled at 1/2 the highest input frequency
None of these
results in a binary code as the final output
must be fed through a filter to reproduce the original signal accurately
both (b) and (c)

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Automation System
Ergonomics refers to:

the cost relationship of the workstation versus productivity
the level of involvement the operator has with the workstation
the technology involved in the workstation itself
None of these
the human aspect of the environment around the workstation as well as the workstation itself

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Automation System
Programmable controllers:

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

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Automation System
Digital signals:

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

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