Automation System
A venturi tube:

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

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

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

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Automation System
If the transient response is under damped:

both a and b
None of these
the present overshoot is zero
steady-state will be reached faster than if the system is overdamped
the value of the output will exceed the value of the input at times during the transient period

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