Automation System
For a type 2 system, the steady-state:

error for a step input is always zero
error for a velocity input is always zero
All of these
input for acceleration input is always non-zero
None of these

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Automation System
A venturi tube:

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

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Automation System
Light sensors:

None of these
never use infrared light as light source
come in a wide variety of mounting styles
cannot be used a s limit switches.
work in direct sunlight

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Automation System
Programmable controllers:

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

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