PCV-110 is a back-pressure regulator designed to reduce the ¬¬¬¬¬_____ psig found at the instrument air header to a usable _____ psig for 3-15 psig valve actuator operation.:
a. 50 psig to 15 psig.
b. 30 psig to 15 psig.
c. 100 psig to 20 psig.
d. 225 psig to 100 psig.
Answer: C
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One problem with causal filters is that the response of the filter always lags the excitation. This problem cannot be eliminated if the filtering is done in real time but if the signal is recorded for later “off-line” filtering one simple way of eliminating the lag effect is to filter the signal, record the response and then filter that recorded response with the same filter but playing the signal back through the system backward. Suppose the filter is a single-pole filter with a frequency response of the form 
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