Process control systems
The diagram shows a
Select one of ...
A) proportional
B) proportional-integral
C) PID
D) analogue
system. The output level is set by adjusting the
Select one of ...
A) the supply voltage.
B) set point input.
C) the amplifier.
D) a reference voltage.
The output from the subtractor is called the
Select one of ...
A) error signal
B) negative feedback
C) output offset
D) gain
and is equal to the
Select one of ...
A) sum
B) difference
C) integral
D) greater
of the set point and the output. The error signal is amplified before being fed to the plant. It gives
Select one of ...
A) integral control.
B) proportional control.
C) negative feedback.
D) a steady output.
The output from the integrator is added to the error signal and
Select one of ...
A) corrects for the output offset.
B) makes output change faster.
C) makes the output overshoot.
D) oscillates.
The output from the differentiator is
Select one of ...
A) the same as
B) the derivative of
C) proportional to
D) the inverse of
the error signal. It increases when the output is
Select one of ...
A) high.
B) decreasing.
C) zero.
D) changing rapidly.
The advantage of a
Select one of ...
A) proportional
B) P-I
C) control
D) P-I-D
is that, in comparison with other systems, its response is
Select one of ...
A) rapid and accurate.
B) precise.
C) fast.
D) proportional.
P-I-D systems
Select one of ...
A) are not
B) are often
C) may be
based on
Select one of ...
A) analogue
B) analogue or digital
C) high voltage
D) integrated
circuits.
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