Automation System
Productivity is defined as:

cost per day
None of these
output per man-hour of labour
cost per unit
number of items manufactured per day

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Automation System
Digital signals:

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

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Automation System
Programmable controllers:

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

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